Park Air Systems B6550-S2 User Guide

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T6TR 50 Watt VHF Multimode Transceiver

This documentation is applicable to transceivers at Mod strike 7

Select Topic

MaintenanceInstallationOperationSpecification

Approvals and

Standards

Approvals and Standards T6TR VHF 50 Watt Transceivers

Approvals:

The equipment is designed to meet the essential requirements of Directives
1999/5/EC, 89/336EEC as amended by Directive 93/68/EEC, and 72/23/EEC.

Standards:

The following standards are applied:
EMC EN 301 489-1; EN 301 489-22.
Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950.
Radio EN 300 676, IC RSS141, FCC part 15 and 87.

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Telecom CS-03.

FCC Statement:

This device has been tested and found to comply with the limits for a Class B digital device, pursuant
to part 15 of the FCC Rules. The se limits are designed to provide reasona ble protection against
harmful interference in a residential installation.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:

❑ Reorient or relocate the receiving antenna.
❑ Increase the separation between the equipment and the receiver.
❑ Connect the equipment into an outlet on a circuit dif ferent from that to which the receiver is

connected.

❑ Consult the supplier or an experienced radio/TV technician for help.

Operation on 8.33 kHz channel spacing is restricted to European customers.

Specification

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This document provides specifications applicable to the

T6TR VHF Multimode Transceiver.

Part 1 General Specification
Part 2 AM Modes
Part 3 Mode 2
Part 4 Mode 3

Page 1

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General Specification

The general specification applies to a transceiver irrespective of the selected operating mode. Separate
listings are given for AM modes, Mode 2 and Mode 3.

Frequency Range

The T6TR VHF Multimode Transceiver is available in two variants as listed below:

❑ The B6550/NB/50 that operates within the frequency band 118 to 136.975 MHz.
❑ The B65500/WB/50 that operates within the frequency band 112 to 155.975 MHz.

Frequency Selectable Band Edges

Four selectable frequency band edges are available on each model:
BE1, BE2, BE3 and BE4. Frequencies can only be selected that lie
between BE1 and BE2 inclusive or between BE3 and BE4 inclusive.
The band edge frequencies can only be set in 25 kHz increments. BE1
and BE3 both default to the lowest selectable frequency for the model
and BE2 and BE4 both default to the highest selectable frequency for
the model.

Frequency Accuracy

Better than 1ppm.

Reference Frequency Adjustment

Provision is made on the front panel to allow the 20.95 MHz reference
oscillator frequency to be adjusted. An output is provided suitable for
driving an external frequency counter.

Adjustment allows the frequency to be set to within 0.15 ppm.

Frequency Change Time

Less than 250 ms from receipt of a remote frequency change
command message.

Number of Channels

The transceiver has a multi-channel capability. 100 channels can be
stored and recalled.

Modulation Modes

AM-Voice (standard).
AM-MSK (optional).
Mode 2 (optional).
Mode 3 (optional).

Page 2

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Power Requirements

The transceiver operates from an ac mains supply, or a dc input supply. When both supplies are
connected, the dc input acts as an automatic backup for the ac mains.

ac input supply The transceiver operates from a 48 to 62 Hz single- phase ac supply

and automatically adjusts to operate from any supply voltage ranging
from 110 Vac to 240 Vac ±10%. The power consumption figures are
given in Table 1.

dc input supply The transceiver operates from a dc input supply between 21.6 and

32 V (measured at the radio’s input). The supply current figures are
given in Table 1.

Table 1 Power Consumption

Transmitting or

Receiving

Transmitting Typical 300 VA 8.5 A

Receiving Typical 70 VA 1.2 A

Requirement Normal Operation

ac dc

Maximum 500 VA 12 A

Dimensions and Weight

The dimensions and weight of the transceiver are:

Width 483 mm (19 inches).
Height 88.9 mm (3.5 inches). The height occupies 2U of equipment cabinet

space.
Depth 430 mm (16.9 inches) measured from front panel to rear panel.
Depth 450 mm (17.8 inches) measured from front panel to rear of fan.
Weight 13.5 kg (29.76 pounds).

Environmental

Temperature range The transceiver operates to specification across the temperature

range of -20 to +55°C.

The transceiver can be stored at temperatures ranging from

-30 to +70°C without causing any damage.

Humidity The transceiver operates to specification at a relative humidity

between 5% and 90% non-condensing.
Altitude The radios operate to specification up to 15,000 feet. Additionally the

equipment is capable of storage at altitudes up to 50,000 feet without

damage.
Shock and vibration The radios comply with shock and vibration protection MIL-STD-810E,

method 516.4, procedure VI - Bench Handling. In all cases, no fixed

parts become loose. No movable part or permanently set adjustment

shifts its setting or position.

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Ventilation The transceivers are cooled by an integral fan, which normally runs at

half speed. At an RF PA temperature of 45°C this is increased to full

speed and at 40°C it reduces to half speed again.

The transceivers also include an additional temperature controlled fan

contained in the power supply.
Warm up time All variants are fully operational to specification within 20 seconds

after switch on.

Page 4

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AM Modes

Introduction

The transceiver can opera te in AM-V oice m ode and A M-MS K mode. The follow ing spe cificat ion s apply
to both modes unless stated otherwise.

Transceiver Tx RF Characteristics

RF Power Output

The RF carrier ou tput power is adjusta ble in 1 W step s from 5 W to 50 W (as an optio n, the m aximum
selectable power can be limited). Output power is automatically controlled under the following conditions:

Frequency range Variations in power remain within -0 to +1 dB over the operational

frequency range.
Low supply voltage Loop error can reduce power progressively by up to ±1 dB for supply

voltages between 24 Vdc and 32 Vdc.
High VSWR Loop error can reduce power progressively by up to 3 dB. Variations

in power remain within ±1 dB into a VSWR of up to 2.5:1 At VSWRs

greater than this the output power may be reduced by 10 dB ±1 dB.
High RF PA temperature If the RF PA temperature sensor exceeds 80° C the output power is

reduced by 3 dB ±1 dB. If the RF PA temperature sensor exceeds

90°C the transceiver is de-keyed and automatically re-keyed at 70°C.

Duty Cycle

100% continuous operation.

Channel Spacing

AM-Voice The transceivers are capable of both 25 kHz channel spacing and

8.33 kHz channel spacing.

AM-MSK 25 kHz only.

Offset Carrier

AM-Voice The T6TR is capable of offsetting the carrier frequency to provide 2, 3

and 4 carrier offset.
AM-MSK Not available

Harmonic Outputs

Second harmonic outputs are less than -36 dBm, third harmonic

outputs are less than -46 dBm and fourth harmonic outputs and above

up to 4 GHz are less than -56 dBm.

Spurious Outputs

The spurious outputs are less than -46 dBm for modulation depths up

to 90%, measured at greater than 500 kHz from carrier in the

frequency range 9 kHz to 4 GHz. There are no coherent spurious

outputs above the spectral mask at less than 500 kHz.

Page 5

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Intermodulation

Intermodulation products, caused by an interfering signal with the

same power as the transmitter isolated by 30 dB, are at least -40 dBc

at ≥±150 kHz and -50 dBc at ≥±500 kHz.

Transceiver Rx RF Characteristics

Sensitivity

118 to 136.975 MHz 12 dB SINAD for -107 dBm 30% modulated.
112 to 117.975 MHz 12 dB SINAD for -105 dBm 30% modulated

and
137 to 155.975 MHz

Notes ...

(1) All references to SINAD in this document include ITU-T recommendation P.53 weighting.
(2) When operating the transce iver in combined T/R antenna con figuration, the sensitivity figures

are degraded by 1 dB.

Channel spacing

AM-Voice mode 25 kHz, or 8.33 kHz.
AM-MSK mode 25 kHz.

IF selectivity

For 25 kHz channel spacing At ±11 kHz from the centre frequency, the signal is attenuated by less

than 6 dB.

At ±25 kHz from the centre frequency, the signal is attenuated by more

than 80 dB.
For 8.33 kHz channel spacing At ±3.5 kHz from the centre frequency, the signal is attenuated by less

than 6 dB.

At ±8.33 kHz from the centre frequency, the signal is attenuated by

more than 70 dB (60 dB using the ETSI test method).

At ±25 kHz from the centre frequency, the signal is attenuated by more

than 80 dB.

Unwanted Signal Suppression

Intermod signal suppression The intermodulation signal suppression is 80 dB or greater (reference

12 dB SINAD) for two unwanted signals spaced 100 kHz

(unmodulated) and 200 kHz (30% modulation) from the channel

frequency.
Blocking ratio 95 dB or greater (reference 12 dB SINAD and degraded by 6 dB) in

the presence of an unmodulated unwanted signal spaced at 200 kHz

from the channel frequency.

105 dB or greater (reference 12 dB SINAD and degraded by 6 dB) in

the presence of an unmodulated unwanted signal spaced at 3 MHz

from the channel frequency.

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Cross-modulation rejection 95 dB or greater (reference 30 dB SINAD and degraded by 10 dB) in

the presence of a 30% modul ated unwant ed signal spac ed at 200 kHz

from the channel frequency.

105 dB or greater (reference 30 dB SINAD and degraded by 10 dB) in

the presence of a 30% modulated unwanted signal spaced at 3 MHz.
Spurious signal suppression 90 dB, or greater (reference 12 dB SINAD) for a 30% modulated

unwanted signal spaced by more than two channels from the tune

frequency up to 1 GHz, 80 dB or greater for frequencies up to 2 GHz

and 70 dB or greater for frequencies above 2 GHz..
Interfering signals At least 6 dB SINAD is achieved for a wanted -87 dBm signal

modulated with a 1 kHz tone 30% in the presence of two -5 dBm

interfering signals, both FM modulated, one with a 19 kHz tone

7.5 kHz deviation at 107.9 MHz and varied by ±4 kHz the other with a

19.1 kHz tone 7.5 kHz deviation with its frequency chosen such that

one of the 3

rd

order products is located on the chosen receive

frequency.

Antenna radiation

Radiation at the antenna socket is less than -81 dBm, typically less

than -100 dBm, within the frequency range 9 kHz to 4 GHz.

Maximum RF Input

The transceiver can withstand an RF input of +36 dBm for 20 seconds,

and a continuous +27 dBM input, without causing damage.

Transceiver Tx Modulation Characteristics

The transceiver Tx modulation characteristics are as follows:

Mode

AM-Voice mode The AM-Voice mode uses Double Side Band (DSB) Amplitude

Modulation (AM) full carrier, emission designator 6K80A3EJN for

25 kHz channels and 5K00A3EJN for 8.33 kHz channels.
AM-MSK The AM MSK mode uses Double Side Band (DSB) Amplitude

Modulation (AM) full carrier, emission designator 13K0A2DJN.

Modulation Depth

The transceiver is capable of modulation depths up to 95%.

Hum and Noise

The hum and noise is more than 45 dB below the signal level for line

input levels <-13 dBm, and more than 50 dB below the signal level for

line input levels ≥−13 dBm, for a carrier modulated by a 1 kHz signal

with a modulation depth of 90%.

Page 7

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Frequency Response

25 kHz channel spacing The variation in frequency response with reference to a 1 kHz signal

is within +0.5 dB and -1.5 dB across the frequency range 300 to

3400 Hz. The response is also less than -20 dB at 100 Hz and below,

and less than -30 dB at 4 kHz and above.

8.33 kHz channel spacing The variation in frequency response with reference to a 1k Hz signal

is within +0.5 dB and -1.5 dB across the frequency range 350 Hz to

2500 Hz. The response is also less than -10 dB at 100 Hz and below,

and less than -30 dB at 3200 Hz and above.

Distortion

25 kHz channel spacing The total harmonic distortion is less than 5% due to signals with a

modulation depth of 90%, within the frequency range 300 Hz to

3400 Hz.

8.33 kHz channel spacing The total harmonic distortion is less than 5% due to signals with a

modulation depth of 90%, within the frequency range 350 Hz to

2500 Hz.

Residual FM

For a test signal of 1 kHz set at 80% modulation depth applied to the

line input of the transceiver, the unwanted peak frequency modulation

does not exceed ±500 Hz.

VOGAD

AM-Voice The VOGAD has an operational range of 30 dB. The VOGAD can be

disabled.
AM-MSK VOGAD permanently disabled.

Mute

AM-Voice The mute level is set at 15 dB below the average speech line level

setting. The mute can be disabled.
AM-MSK The mute is permanently disabled.

Differential group delay

AM-MSK only There is a 60 µs of differential group delay for signals in the range

1200 to 2400 Hz.

Transceiver Rx Modulation Characteristics

The transceiver Rx modulation characteristics are as follows:

Mode

AM-Voice mode The AM-Voice mode uses Double Side Band (DSB) Amplitude

Modulation (AM) full carrier, emission designator 6K80A3EJN for

25 kHz channels and 5K00A3EJN for 8.33 kHz channels.
AM-MSK The AM-MSK mode uses Double Side Band (DSB) Amplitude

Modulation (AM) full carrier, emission designator 13K0A2DJN.

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Frequency response

25 kHz channel spacing The variation in frequency response with reference to a 1 kHz signal,

is within +1 dB and -2 dB across the frequency range 300 to 3400 Hz.

The response is less than -20 dB for frequencies at or below 100 Hz,

and less than -30 dB at 4 kHz and above.

8.33 kHz channel spacing The variation in frequency response with reference to a 1 kHz signal,

is within +1 dB and -2 dB across the frequency range 350 to 2500 Hz.

The response is less than -10 dB for frequencies at or below 100 Hz,

and less than -30 dB at 4 kHz and above.

Distortion

25 kHz channel spacing For RF input signals between -53 dBm and +10 dBm, the total

harmonic distortion is less than 5% within the frequency range 300 Hz

to 3.4 kHz when the modulation depth is between 30 and 90%.

8.33 kHz channel spacing For RF input signals between -53 dBm and +10 dBm, the total

harmonic distortion is less than 5% within the frequency range 350 Hz

to 2.5 kHz when the modulation depth is between 30 and 90%.

Wanted Signal Dynamic Range (RF AGC)

For a 90% modulated on-channel signal, a change in signal level from

-107 dBm to +10 dBm results in less than a 3 dB change in audio

output. On-channel signals modulated at 90% up to a level of

+17 dBm achieve at least 10 dB SINAD.

Audio AGC

AM-Voice Mode The audio AGC compresses a 30% to 90% variation in input

modulation depth to an audio output power change of 1 dB or less.

The audio output level is maintained at the equivalent of 90%

modulation. Audio AGC can be disabled.
AM-MSK Mode The audio AGC is permanently disabled.

Squelch

The transceiver has a noise compensated carrier operated squelch

with an adjustment range of -114 to -60 dBm, and providing greater

than 60 dB of quieting. Note that when the RF pre-attenuator is

switched in, the adjustment levels are increased by 6 dB.

The squelch has a noise compensation disable facility to provide

carrier only operation.

Transceiver Tx Control

Transceiver Tx control characteristics are as follows:

Audio Inputs

AM-MSK AM-MSK data is connected to the transceiver via an external modem

connected to the line inputs.

Page 9

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AM-Voice Voice can be connected to the transceiver via the front panel

microphone connector. Voice can also be connected via the line

inputs. Line level setting from -30 to +10 dBm.

PTT Time-Out

The time-out period is adjustable from 2 to 510 seconds in 2 second

steps or can be disabled.

Tranceiver Rx Control

AM-Voice Audio Outputs

The transceiver’s outputs are the remote audio line output, the headset

output and the loudspeaker. Line level output is adjustable between -30

and +10 dBm.

AM-MSK Output

AM-MSK data is connected to an external modem through the remote

audio line output.

Page 10

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Mode 2

Introduction

This section gives the transceiver’s specification applicable to Mode 2 operation. Mode 2 parameters are
identical to AM-Voice mode with the following exceptions:

Transceiver Tx RF Characteristics

RF Power Rise Time

The transceiver produces more than 90% of full power output within

the first 2 symbols of the power stabilization segment, which is the first

segment of the training sequence and consists of 4 symbols each

representing 000.

RF Power Decay Time

The output power decays by more than 20 dB within 2.5 symbo ls of

the middle of the final symbol.

Channel Spacing

25 kHz channel spacing only.

Transceiver Tx Modulation Characteristics

Mode

Mode 2 uses Carrier Sense Multiple Access (CSMA) differentially

encoded 8-phase shift keying (D8PSK), using a raised cosine filter

with α =0.6 (nominal value), emission designator 14K0G1DE.

Information is differentially encoded with 3 bits per symbol transmitted

as changes in phase rather than absolute phase. The data stream is

divided into groups of 3 consecutive data bits, least significant bit first.

Zeros are padded to the end of transmissions if needed for the final

channel symbol.

Modulation Rate

The symbol rate is 10,500 symbols/second (±0.005%), resulting in a

nominal bit rate of 31,500 bits/s.

RMS Phase Error

The RMS phase error is less than 3°. The error vector magnitude is

less than 6%.

Phase Acceleration

The total frequency change during the transmission of the unique word

is less than 10Hz. After this, the phase acceleration is less than

500 Hz/s.

Page 11

Transceiver Rx RF Characteristics

Sensitivity

The transceiver has a sensitivity better than -102dBm for 1x10
Decoding off.

Channel Spacing

Mode 2 channel spacing is 25 kHz.

IF Selectivity

At ±11 kHz from the centre frequency, the signal is attenuated by less

than 6 dB.

At ±25 kHz from the centre frequency the signal is rejected by more

than 80 dB.

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-3

Bit Error Rate (BER) with Reed Solomon

Unwanted Signal Suppression

With the required signal at -92 dBm, a BER of better than 1x10

Reed Solomon Decoding switched off is achieved under the following

conditions:

❑ An interfering signal at -32 dBm on an adjacent channel

❑ One or more out-of- band i nterfer ing s ignals h aving a tota l lev el of

-33 dBm

❑ One or more VHF FM broadcast signals having a total level of

-5 dBm

❑ Co-channel rejection better than 20 dB.

Synchronisation

For received signals greater than -103 dBm, the probability of

synchronisation is greater than 0.999. The pr obability of false

synchronisation is 3x10

Transceiver Rx Modulation Characteristics

Mode 2 uses Carrier Sense Multiple Access (CSMA) differentially

encoded 8-phase shift keying (D8PSK) using a raised cosine filter with

α = 0.6 (nominal value), emission designator 14K0G1DE.

-3

with

-3

Wanted Signal Dynamic Range (RF AGC)

A BER better than 1x10

achieved for received signals of -102 dBm to +10 dBm.

Frequency Offsets

The transceiver operates with frequency offsets up to 826 Hz.

Page 12

-3

with Reed Solomon Decoding off is

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Mode 3

Introduction

This section gives the transceiver’s specification applicable to Mode 3 operation. Mode 3 parameters are
identical to AM-Voice mode with the following exceptions:

Transceiver Tx RF Characteristics

RF Power Rise Time

The transceiver produces more than 90% of full power output within

the first 2 symbols of the power stabilization segment, which is the first

segment of the training sequence and consists of 4 symbols each

representing 000.

RF Power Decay Time

The output power decays by more than 20 dB within 2.5 symbo ls of

the middle of the final symbol.

Channel Spacing

25 kHz channel spacing only.

Transceiver Tx Modulation Characteristics

Mode

Mode 3 uses Time Division Multiple Access (TDMA) differentially

encoded 8-phase shift keying (D8PSK), using a raised cosine filter

with α=0.6 (nominal value), emission designator 14K0G7WET.

Information is differentially encoded with 3 bits per symbol transmitted

as changes in phase rather than absolute phase. The data stream is

divided into groups of 3 consecutive data bits, least significant bit first.

Zeros are padded to the end of transmissions if needed for the final

channel symbol.

Modulation Rate

The symbol rate is 10,500 symbols/second (±0.005%), resulting in a

nominal bit rate of 31,500 bits/s.

RMS Phase Error

The RMS phase error is less than 3°. The error vector magnitude is

less than 6%.

Phase Acceleration

The total frequency change during the transmission of the unique word

is less than 10Hz. After this, the phase acceleration is less than

500 Hz/s.

Page 13

Transceiver Rx RF Characteristics

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Sensitivity

Channel Spacing

IF Selectivity

Unwanted Signal Suppression

The transceiver has a sensitivity better than -102dBm for 1x10

-3

Bit

Error Rate (BER) with Reed Solomon Decoding off.

In order to improve co-location performance where maximum

sensitivity cannot be realized due to large unwanted signals, the

transceiver’s sensitivity can be reduced by 6 dB. This is achieved by

switching on the 6 dB RF pre-attenuator from the front panel menu

system.

Mode 3 channel spacing is 25 kHz.

At ±11 kHz from the centre frequency, the signal is attenuated by less

than 6 dB.

At ±25 kHz from the centre frequency the signal is rejected by more

than 80 dB.

With the required signal at -92 dBm, a BER of better than 1x10

-3

with
Reed Solomon Decoding switched off is achieved under the following
conditions:

❑ An interfering signal at -32 dBm on an adjacent channel
❑ One or more out-of- band i nterfer ing s ignals h aving a tota l lev el of

-33 dBm

❑ One or more VHF FM broadcast signals having a total level of

-5 dBm

❑ Co-channel rejection better than 20 dB.

Synchronisation

For received signals greater than -103 dBm, the probability of
synchronisation is greater than 0.999. The pr obability of false
synchronisation is 3x10

Transceiver Rx Modulation Characteristics

Mode 3 uses Time Division Multiple Access (TDMA) differentially
encoded 8-phase shift keying (D8PSK) using a raised cosine filter with
α = 0.6 (nominal value), emission designator 14K0G7WET.

Wanted Signal Dynamic Range (RF AGC)

A BER better than 1x10
for received signals of -102 dBm to +10 dBm. The AGC attack time is
less than 0.5 ms and the decay time is less than 1 ms for a 40 dB step
input.

-3

.

-3

with Reed Solomon decoding off is achieved

Frequency Offsets

The transceiver operates with frequency offsets up to 826 Hz.

Page 14

Operation

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This document describes the controls, indicators, setting up and operating instructions

applicable to the T6TR VHF Multimode Transceiver.

Part 1 Controls and Indicators
Part 2 Setting Up and Operation

Page 1

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Controls and Indicators

This part details the purpose of all controls and indicators of the T6TR transceivers.

Front Panel

The front panel’s controls, indicators and connectors are shown below and detailed in the following
paragraphs.

Scroll SwitchLCD

ALARM

RECEIVE

TRANSMIT

READY

STANDBY

F r e q 1 1 8 .0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
M o d e A M V o i c e 1

P w r

SCROLL/

SELECT

REFERENCE

HEADSET/
MICROPHONE/
DIAGNOSTICS

Scroll/Select Switch and LCD

The Scroll/Select switch is used in conjunction with the LCD to select most of the transceiver's
operational settings. Use of the switch and LCD is fully detailed in the section of this user guide applicable
to the particular operatin g mod e. Dur i ng norm al op er ati on, th e LCD sh ows the op erati ng fr equ ency , the
channel number (if the channel store facility is used), the carrier offset (if used), and displays a graphical
representation of instantaneous peak power.

The example LCD scree n below shows the tr ansceiver operat ing on 118.000 M Hz; the frequency has
been preset as channel 100 and offset at +7.3 kHz.

Transmit Indicator

An amber indicator that lights when the transmit circuit is keyed and producing output power.

Receive Indicator

An amber indicator that lights when a signal is received that is above the squelch threshold. Additionally,
this indicator is lit when the transceiver's squelch facility is switched off (squelch defeated). This indicator
also lights when the transceiver is keyed.

Alarm Indicator

A red indicator that either flashes, or lights, when a BIT fault has been de tected. BIT indications are
classified as either Alarms or Alerts.

If an ‘alert’ conditi on is detected, the Alarm i ndicator flashes, the Ready i ndicator remains lit, and the
transceiver remains operational. A BIT ‘alert’ is indicated if:

❑ If the transceiver RF output power has red uced from its setting by more than 1 dB b ut not more

than 3 dB

❑ If the supply volts falls below a pre-defined level.

Any other BIT condit ion results in an alarm. When detected, the Alarm indicator lights and the Ready
indicator becomes unlit; the transceiver cannot be used.

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Ready Indicator

A green indicator that lights when the transceiver is ready for use and no BIT faults have been detected.

Standby Indicator

A red indicator that ligh ts wh en the transceiver is in stan dby mo de. W hen in standby mode, most of the
radio's circuits are inactive, the front panel LCD is blanked, and the transceiver cannot be keyed.

Standby mode is selected and deselected using the front panel Scroll/Select switch and LCD, by initiating
an instruction th rough a MARC system, th rough a T6 control ler or through the V FP. For d etails of front
panel selection and deselection see page 15.

Reference Connector

An SMB jack soc ket that allows a frequency coun ter to monitor the tr ansceiver's re ference frequen cy.
This connector is used onl y for mainte nance pur poses. The in structions for checki ng and adjus ting the
reference frequency are given in the Maintenance section.

Headset/Microphone/Diagnostics Connector

A dual purpose connector that allows either a headset/microphone, or a PC, to be connected to t he
transceiver. The connector is a 7-pin self-locking DIN socket; the pin-out is shown in Table 1.

A microphone is fitted to this con nec tor to e nabl e th e tr ansce iv er to be operat ed i n AM loc al mode . T he
connections are detailed in Table 1. A PC can also be connected to allow the VFP to be displayed. Using
the VFP is detailed in the T6TR maintenance section. The PC connections at the transceiver are shown
in Table 2 on page 4.

Viewed from front

Table 1 Headset/Microphone/Diagnostics Connector - Audio Connections

Pin

Number

1 Microphone ground - 0 V.

3 Microphone PTT Input 0 V to PTT.

Signal

Input or

Output

Description

5 Sidetone/headset drive Output 0 to 3 V pk-pk.

6 Microphone input Input 2 to 35 mV rms on Passive setting and 8 to 140 mV rms

on Active setting to remain in VOGAD range.

7Ground - 0V.

Page 3

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Table 2 Headset/Microphone/Diagnostics Connector - PC Connections

Pin

Number

2 Transmit data Output RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no

4 Receive data Input RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no

7 Ground - 0 V.

Signal

Input or

Output

Description

handshaking.

handshaking.

Rear Panel Power Switch

The rear panel's power switch is a 2-way rocker switch used to select between power on, and standby.

WARNING

When the Power Switch is set to the Standby position, dangerous voltages are s till prese nt
in the transceiver's internal power supply circuitry. To ensure safe working, the transceiver
must be isolated from the ac and dc input supplies.

Dangerous Voltages

= Standby= On

Page 4

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Setting Up and Operation

Introduction

Setting up the transcei ver involves selecting vari ous parameters using the Virt ual Front Panel (VFP),
through a Multi-Acces s Remote Control (M ARC) system , from a T6 co ntrol ler, or from the transc eiver’ s
front panel. The transceiver can be configured for remote or local use.

Table 11 on page 35 details the functions and parameters that can be set from all these sources.

The rest of this doc ument details how to configure the transce iver from the front panel, and how to
operate the radio in local mode.

Selecting most of th e transce iver' s operati onal set tings is carri ed out usin g the front panel Scro ll/Se lect
switch and the LCD (see the illustration below). No attempt to set up the transceiver should be made until
the transceiver has been installed as per the installation procedures given in the Installation section.

Normal Operation

During normal operation, the LCD displays the Main screen. This screen shows the operating frequency,
the channel number (i f the channel store facility is used), the c arrier offset (if used), and displays a
graphical representa tion of outp ut powe r when the trans ceive r is keyed . If the trans ceiv er has been set
to Standby mode, which is shown by the front panel Standby Indicator being lit, the LCD is blanked.

Scroll SwitchLCD

RECEIVE

ALARM

TRANSMIT

READY

STANDBY

F r e q 1 1 8 .0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
M o d e A M V o i c e 1

P w r

SCROLL/

SELECT

REFERENCE

HEADSET/
MICROPHONE/
DIAGNOSTICS

Using the Scroll/Select Switch

The Scroll/Select switc h (referred to throughout this section as the ‘Switch’) is used to leav e the Main
screen and display the Control screen (see page 8). Further use of the Switc h di splays vari ous sel ectio n
menus and allows t he required parameters to be set. Th e switch has three actions: it can b e turned
clockwise, anti-clockwise, or momentarily pushed in.

Page 5

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Main Page

Screen Protocol

The following protocol is applicable to all screens described in this document.

Main Screen During normal transceiver operation, the Main screen, an example of which is shown

below, is disp layed.

F r e q 1 1 8 . 0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
M o d e A M V o i c e
V o l I I I I I I I I I I

Switch Refers to the front panel Scroll/Select switch. The switch is turned clockwise to scroll

through fields from left to right, and from top to bottom. The switch is turned
anti-clockwise to scroll through fields from right to left, and from bottom to top. The
switch is pressed to make a selection.

Time out If during any setting up procedure the Scroll/Select switch is not operated for

30 seconds, the display returns to the Main screen. If editing any parameter has not
been completed, the transceiver stays on the original setting.

>> Indicates more fields are available other than those currently displayed. To access

those fields, turn the switch clockwise through the last displayed field.

<< Indicates more fields are available other than those currently displayed. To access

those fields, turn the switch anti-clockwise through the first displayed field.

Back When Back is selected, you are returned to the previous menu.
Exit When Exit is selected, you are returned to the Main screen.

Menu System

The front panel control of the radio is implemented through a hierarchical menu system as shown on the
following page.

Page 6

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F r e q 1 1 8 . 0 0 0 M H z
C h 1 0 0
M o d e A M V o i c e
V o l I I I I I I I I I I

Main Screen

Displayed during normal

transceiver operation

with the transceiver

unkeyed.

Frequency

Set the

transceiver’s

operating
frequency

Backlight

Adjust the

display’s
backlight

Control Screen

Configure the transceiver’s

operating parameters, ac cess

the BIT facility or view the

software configuration.

Channel

Set or recall up

to 100 preset

frequency

channels

Settings

Set the

transceiver’s

operational

settings

Ref Freq

Adjust the

transceiver’s

reference

frequency

Initiate a BIT

test and view

Band Edges

Set up the

transceiver’s

band edges

Menu Lock Screen

(see page 8)

BIT

results

S/W Config

transceiver’s
configuration

Mode and

Mode

Settings

Select Mode

View the
software

Standby

Enter or Exit

standby mode

Polarities

Set the active

polarity for

certain hardwire

connections

AM-Voice Mode

Settings

(see page 19)

AM-MSK Mode

Settings

(see page 20)

Menu System

Page 7

Digital Modes
(see page 23)

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Menu Lock Screen

A security facility available onl y from the VFP allows the trans ceiver's f ront panel to be ‘l ocked’. Wh en
this facility is active, no operational settings can be made from the front panel until an ‘unlock’ command
is sent from the VFP.

The following screen is displayed when ‘lock’ is active, and the front panel switch is pressed.

S E C U R I T Y M E S S A G E

F r o n t P a n e l

L o c k e d

O K

To exit the system lock screen:

❑ Select OK, then press the switch. You are returned to the Main screen.

or,

❑ Wait for the 30 second time-out to expire. You are returned to the Main screen.

Control Screen

The Control screen is entered from the Main screen by pressin g the switch. The following screen is
displayed:

Change the transceiver’s operating frequency.

Store or recall preset channel frequencies.
Select operating mode and mode settings.

Initiate a BIT test and view results.

View software configuration.

Enter or exit standby mode.

F r e q u e n c y
C h a n n e l
S e t t i n g s
E x i t > >

B I T
S / W C o n f i g
S t a n d b y
E x i t < <

Page 8

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Notes for Setting Up the Transceiver

The following notes should be read before setting up the transceiver. They advise on the special
frequency displa y when using 8.33 kHz chan nel spacin g, and give guidan ce on the o ptimum line l evel
settings. Note that for operation in the United States of America, this equipment is certified only for
operation using 25 kHz channel spacing.

Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing

When setting the oper ating frequ ency of the tra nsce iver an d 8.33 kH z ch annel sp acing is s elected, the
displayed frequency differs from the actual channel frequency. Table 3 shows the pattern used for
25 kHz and 8.33 kHz spaced channel frequencies from 118.000 MHz to 118.141 MHz. The pattern is the
same for any frequency within the transceiver's frequency range. The display conforms to ICAO
convention for 8.33 kHz operation.

Table 3 25 kHz and 8.33 kHz Channel Spacing Displays

Actual Frequency

(to 4 decimal places)

118.0000 MHz

118.0000 MHz

118.0083 MHz

118.0166 MHz

118.0250 MHz

118.0250 MHz

118.0333 MHz

118.0416 MHz

118.0500 MHz

118.0500 MHz

118.0583 MHz

118.0666 MHz

118.0750 MHz

118.0750 MHz

118.0833 MHz

118.0916 MHz

118.1000 MHz

118.1000 MHz

118.1083 MHz

118.1166 MHz

Channel
Spacing

25 kHz

8.33 kHz

8.33 kHz

8.33 kHz

25 kHz

8.33 kHz

8.33 kHz

8.33 kHz

25 kHz

8.33 kHz

8.33 kHz

8.33 kHz

25 kHz

8.33 kHz

8.33 kHz

8.33 kHz

25 kHz

8.33 kHz

8.33 kHz

8.33 kHz

Displayed Frequency

at Transceiver's Front Panel

118.000 MHz

118.005 MHz

118.010 MHz

118.015 MHz

118.025 MHz

118.030 MHz

118.035 MHz

118.040 MHz

118.050 MHz

118.055 MHz

118.060 MHz

118.065 MHz

118.075 MHz

118.080 MHz

118.085 MHz

118.090 MHz

118.100 MHz

118.105 MHz

118.110 MHz

118.115 MHz

118.1250 MHz

118.1250 MHz

118.1333 MHz

118.1416 MHz

25 kHz

8.33 kHz

8.33 kHz

8.33 kHz

118.125 MHz

118.130 MHz

118.135 MHz

118.140 MHz

Input Line Level Settings

The input line lev el setting displayed on the f ro nt pa nel is eq uiv al en t to the average speech le vel wi th a
peak-to-average ratio of 13 dB. This corresponds to the level specified for the lines.

When testing the transceiver using a sine wave, the line input level should be set to 10 dB above the line
level setting. The VOGAD and mute thresholds are p re-set at 10 dB and 15 dB respectively below the
line level setting.

Table 4 shows the relationship between the input line level, VOGAD threshold and mute threshold.

Page 9

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Table 4 Relationship Between Line Level, VOGAD Threshold and Mute Threshold

Line Level

Setting (dBm)

+10 +10 +20 0 -5

+5 +5 +15 -5 -10

00+10-10-15

-5 -5 +5 -15 -20

-10 -10 0 -20 -25

-15 -15 -5 -25 -30

-20 -20 -10 -30 -35

-25 -25 -15 -35 -40

-30 -30 -20 -40 -45

Average Speech

Level (dBm)

Sine Wave Level

(dBm)

VOGAD Threshold

(dBm)

Mute Threshold

(dBm)

Output Line Level Setting

The output line level setting displayed on the front panel is equivalent to the average speech level with a
peak-to-average ratio of 13 dB. This corresponds to the level specified for the lines.

When testing the transc eiver using a signal gen erator with sine wave mo dulation, the line output le vel
will be 10 dB above the line level setting.

Table 5 shows t he relationship between line level, output levels with av erage speech and sine wave

(assuming that the audio AGC is set to on, and the modulation depth is between 30% and 100%).

Table 5 Relationship between Line Level, Output Levels with Average Speech

and Sine Wave

Line Level Setting

(Front Panel Setting)

(dBm)

+10 +10 +20

+5 +5 +15

00+10

-5 -5 +5

-10 -10 0

-15 -15 -5

-20 -20 -10

-25 -25 -15

-30 -30 -20

Output Level with

Average Speech

(dBm)

Output Level with

Sine Wave

(dBm)

Page 10

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Changing the Transceiver’s Operating Frequency

The transceiver’s frequency can be changed in two ways: either from the frequency screen, or by
recalling a preset channel. This procedure details using the Frequency screen.

(1) From the Control screen, select

frequency to display the Frequency
screen.

(2) Turn the switch to highlight the dig it to

be changed, then press the switch.

(3) Turn the switch until the required digit

is shown, then press the switch.

(4) Repeat until the required frequ ency is

shown, then highlight OK and press the
switch.

F r e q 1 1 8 . 0 0 0 M H z

C a n c e l O K

Page 11

To Store and Recall Frequency Channels

Up to 100 frequency channels can be stored in the transceiver.

To store a Channel Frequency

(1) From the Control screen, select

Channel to display the Channel
screen. Highlight Channel, press the
switch and then turn it until the required
channel number is displayed; press the
switch.

(2) Highlight the MHz frequency value

(see Example 2), press the s wit ch and
then turn it until the required MHz value
is shown. Press the switch.

(3) Highlight the kHz frequency value (see

Example 3), press the swi tch and the n
turn it until the required kHz value is
shown. Press the switch.

(4) Highlight Store and press the switch.

The new frequency is now stored in the
selected channel number.

To recall a Stored Frequency Channel

(1) From the Control screen, select

Channel to display the Channel
screen.

(2) To make the transceiver operate on any

preset channel frequency, highlight
Channel and press the switch. Turn the
switch until the required channel
number/frequency is displayed, then
press the switch.

(3) Turn the switch to highlight Recall, then

press the switch. E xit the screen. The
transceiver now operates on the
recalled channel frequency.

C h 1 0 0
F r e q 1 2 1 . 5 0 0 M H z
R e c a l l
B a c k E x i t

Channel Screen - Example 1

C h 1 0 0
F r e q 1 1 8 . 0 0 0 M H z
S t o r e
B a c k E x i t

Channel Screen - Example 2

C h 1 0 0
F r e q 1 1 8 . 0 0 0 M H z
O u t s i d e B a n d E d g e
B a c k E x i t

Channel Screen - Example 3

C h 1 0 0
F r e q 1 1 8 . 0 0 0 M H z

I nn v a l i d f o r M o d e

B a c k E x i t

Channel Screen - Example 4

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Notes:
If a frequency ou tside the band edge limits is

entered, a message (see Channel Screen ­Example 3) is displayed.

If a frequency not valid for the mode of
operation is entere d, a m es sage ( se e Cha nne l
Screen - Example 4) is displayed.

Page 12

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To Initiate a BIT Test

Use the following procedur e to initiate an interrup tive BIT test from the transceiver's fro nt panel. A BIT
test cannot be initiat ed while the transceiv er is keyed . After a BIT test has been run, the BIT scre en is
displayed (see AM-Voice and AM-M SK BIT Screen on page 28). An interruptive BIT test cannot be
initiated in Mode 2 or Mode 3.

During an interruptive BIT test, the transceive r radiates modu lated carr ier waves at the set
power. Users should therefore obtain the necessary authority before initiating a test.

If the test is to be carri ed out with the antenna discon nected, ensure a l oad is fitted to t he
transceiver's antenna connector.

In order to test the line input stages, an internally generated 1 kHz tone is injected into the
line input circuit. Any other audio present on the line input will cause the test to be
inaccurate. Therefore the transceiver must not be keyed during the test.

(1) From the Main scr een, pres s the s witch to d isplay the Contr ol scr een. Tu rn the s witch unt il BIT

is highlighted. Press the switch.

B I T
S / W C o n f i g
S t a n d b y
E x i t < <

(2) Ensure the BIT menu is displayed. Turn the switch until BIT Initiate is highlighted. Press the

switch.

B I T I n i t i a t e
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
E x i t > >

(3) During the test, which takes approximately two seconds, the Testing screen is displayed.

T e s t i n g

P l e a s e W a i t

(4) On completion, and if the interruptive test was initiated from the front panel, one of the following

screens will be shown.

Page 13

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T e s t S t a t u s

P A S S

O K

(5) Selecting OK takes the user back to the BIT screen.

T e s t S t a t u s

F A I L

O K

(6) Selecting OK takes the user back to the BIT screen. The user can then scroll through the screen

to check out transceiver parameters for failure.

Page 14

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Standby Mode

Standby mode is a power saving feature that can be used for non-ope rational transceivers. Whe n in
standby mode, most of t he transceiver's cir cuits are inactive, t he LCD is blanked, an d the transceiver
cannot be keyed. To put the transceiver into standby mode, use the following procedure.

When the transceiver is in Standby mode, the red front panel Standby indicator is lit.

To Enter Standby Mode

(1) From the Control screen select

Standby.

(2) At the Standby screen, select Yes.

E n t e r S t a n d b y ?

(3) Check that the displ ay blanks and

the front panel Sta ndby indica tor is
lit.

To Exit Standby Mode

(1) Press the Switch.
(2) Select Yes.
(3) Check that the Main screen is

displayed and that the front panel
Standby indicator is unlit.

Y e s N o

E x i t S t a n d b y ?

Y e s N o

Page 15

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Settings

Operational settings for the T6TR VHF trans ceiver are co nfigured at the front panel, th rough the V FP,
and through an assoc iated MARC system (or compa tible control syst em). Some settings ca n also be
made remotely via a T6 controller. The Settings screen is entered from the Control screen.

The settings that can be selected at the front panel Settings screen are:

❑ Mode - either AM-Voice, AM-MSK, Mode 2 or Mode 3.
❑ Mode Settings - allows the selected mode parameters to be set
❑ Polarities
❑ Band edges
❑ Backlight
❑ Reference frequency.

Note that the mode selec tion, refer ence frequen cy and ba cklight ar e set from th is screen. W hen mode
settings, polarities and band edges are selected the user is taken to other screens.

M o d e A M V o i c e
M o d e S e t t i n g s
P o l a r i t i e s
E x i t > >

B a n d E d g e s
R e f F r e q 5 0 . 0 %
B a c k l i g h t 0 3 0 s
E x i t < < > >

B a c k
E x i t

Select between AM-Voice, AM -MSK, Mode 2 or Mode 3.
Select to take you to the mode specific Settings menu.
Select to take you to the Polarities menu.

Set the transceiver’s frequency band edges.
Align the transceiver’s reference frequency (Note 1).
Adjust the LCD’s backlight time out (Note 2).

Notes:

1. Setting the transceiver’s reference frequency is a maintenance operation. The current value should not be
reset unless the correct test equipment is connected. See the Maintenance section.

2. The LCD’s backlight can be se t for perm anentl y on, off, o r timed to stay on for a p eriod b etween 1 5 and 12 0
seconds.

General and mode specific settings, showing default values, are referenced in Table 6 on page 17. Click
on any required parameter by page number for further references.

Page 16

Table 6 Operational Settings from the Front Panel

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Parameter

Menu lock screen All Locked or unlocked Unlocked page 8
Enter standby mode All Yes or No - page 15
Exit standby mode All Yes or No - page 15
Set mode of

operation
Set polarities AM-Voice

Band edges All

LCD backlight All 15 to 120 s, On or Off 30 s page 16
RF Power All 5 to 50 W 50 W page 19
Audio line in level AM-Voice

Audio line out level AM-Voice

Inhibit AM-Voice

PTT (key) AM-Voice

Tx time out AM-Voice

Modulation depth AM-Voice

Mute AM-Voice On or Off On page 19
VOGAD AM-Voice On or Off On page 19
Antenna C/O delay AM-Vo ice

Mode Adjustment Range Factory Default Setting Further

All AM-voice, AM-MSK,

Mode 2 or Mode 3
STD or INV STD page 24

AM-MSK

NB model

118.000 to 136.975 MHz
or

AM modes only

AM-MSK

AM-MSK

AM-MSK

AM-MSK

AM-MSK

AM-MSK

WB model

112.000 to 155.975 MHz

-30 to +10 dBm -13 dBm page 19 and

-30 to +10 dBm -13 dBm page 19 and

On or Off Off page 19 and

On (key), Off (de-key) Off page 19 and

2 to 510 s or Off 180 s page 19 and

5 to 95% 85% page 19 and

On or Off On

AM-voice page 16

NB model

118.000 and 136.975 MHz
WB model

112.000 and 155.975 MHz

Reference

page 33

page 21

page 21

page 21

page 21

page 21

page 21

page 19

AM-MSK

Offset AM-Voice 0, ±2.5, ±5, ±7.3, or

±7.5 kHz

Squelch AM-Voice

AM-MSK

RF Pre-attenuation AM-Voice

AM-MSK

Squelch Defeat AM-Voice

AM-MSK

Squelch noise
compensation

Squelch carrier
override

AM-Voice
AM-MSK

AM-Voice
AM-MSK

-114 to -60 dBm in 1 dB
steps. With the RF
pre-attenuator selected,
the range is -108 to

-54 dBm
On or Off Off page 19 and

On or Off Off page 19 and

On or Off On page 19 and

On or Off Off page 19 and

Page 17

Off
0 (No offset) page 19

-107 dBm page 19 and

page 21

page 21

page 21

page 21

page 21

page 21

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Main Page

Table 6 Operational Settings from the Front Panel (Continued)

Parameter

Mode Adjustment Range Factory Default Setting Further

Reference

Audio AGC AM-Voice On or Off On page 19
Loudspeaker AM-Voice On or Off On page 19
Step AM-Voice 8.33, 25 kHz or both 25 kHz page 20
Mic AM-Voice Active or Passive Passive page 20
Key priority AM-Voice

AM-MSK

Local PTT AM-Voice

AM-MSK

Remote PTT AM-Voice

AM-MSK

Remote phantom PTT AM-Voice

AM-MSK

Local-Remote or
Remote-Local

Local-Remote page 20 and

page 21

Enabled or Disabled Enabled page 20 and

page 21

Enabled or Disabled Enabled page 20 and

page 21

Enabled or Disabled Enabled page 20 and

page 21

Self receive AM-Voice On or Off Off page 20

AM-Voice Settings Procedure

During this procedure, the following parameters, applicable to AM-Voice operation, can be set:

❑ RF power output
❑ Audio Line input level
❑ Audio Line output level
❑ Inhibit
❑ PTT on (key) or off (de-key)
❑ Transmitter time out
❑ Modulation depth
❑ Mute (on or off)
❑ VOGAD (on or off)
❑ Antenna c/o delay (on or off)
❑ Offset
❑ Squelch (See “Squelch Setting Options” on

page 22.)

❑ RF pre-attenuation (on or off)

❑ Squelch defeat (on or off)
❑ Squelch noise compensation (on or off)
❑ Squelch carrier override (on or off)
❑ Audio AGC (on or off)
❑ Loudspeaker (on or off)
❑ Step (25 kHz or 8.33 kHz)
❑ Mic (Passive or Active)
❑ Key priority (local or remote)
❑ Enable or disable local PTT
❑ Enable or disable remote PTT
❑ Enable or disable remote phantom PTT

❑ Self receive

Page 18

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AM-Voice Mode Settings Screen

The AM-Voice mode setting screen is a accessed from the Settings screen. Use the Scroll/Select switch
to select the parameter, then enter the required setting(s).

Adjustments

P o w e r 5 0 W
L i n e I n - 1 3 d B m
L i n e O u t - 1 3 d B m
E x i t > >

I n h i b i t O F F
P T T O F F
T X T i m e o u t 1 8 0 s
E x i t < < > >

M o d D e p t h 8 5 %
M u t e O N
V O G A D O N
E x i t < < > >

RF power between 5 W to 50 W.
Audio line in level between -30 to +10 dBm.
Audio line out level between -30 to +10 dBm.

On or Off.
On (key), Off (de-key).
2 to 510 s.

5 to 95%.
On or Off.
On or Off.

A n t C / O D e l O N
O f f s e t 0 . 0 k H z
S q u e l c h - 1 0 7 d B m
E x i t < < > >

R F P r e - A t t e n O F F
S q l D e f e a t O F F
S q l N / C o m p O N
E x i t < < > >

S q l C a r r O / R O F F
A u d i o A G C O N
S p e a k e r O N
E x i t < < > >

On or Off.
0, ±2.5, ±5, ±7.3, ±7.5 kHz.

-114 to -60 dBm in 1 dB steps. With the RF

pre-attenuator selected, the range is -108 to

-54 dBm.

On or Off.
On or Off.
On or Off.

On or Off.
On or Off.
On or Off.

Page 19

S t e p 2 5 k H z
M i c P A S S I V E
K e y P r i o r i t y L - R
E x i t < < > >

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Adjustments

25 kHz, 8.33 kHz or both.
Active or Passive.
Local-remote or Remote-local.

L o c a l P T T E N
R e m o t e P T T E N
R e m P h a n P T T E N

Enabled or Disabled.
Enabled or Disabled.
Enabled or Disabled.

E x i t < < > >

S e l f - R e c e i v e O F F

On or Off.

B a c k
E x i t

< <

AM-MSK Mode Settings Procedure

During this procedure, the following parameters, applicable to AM-MSK operation, can be set:

❑ RF Power output
❑ Audio Line input level
❑ Audio Line output level
❑ Inhibit
❑ PTT on (key) or off (de-key)
❑ Transmitter time out
❑ Modulation depth
❑ Antenna c/o delay (on or off)
❑ Squelch (See “Squelch Setting Options” on

page 22.)

❑ RF pre-attenuation
❑ Squelch defeat
❑ Squelch noise compensation
❑ Squelch carrier override
❑ Key priority (local or remote)
❑ Enable or disable local PTT
❑ Enable or disable remote PTT
❑ Enable or disable remote phantom PTT

Page 20

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AM-MSK Mode Settings Screens

The AM-Voice mode setting screen is a accessed from the Settings screen. Use the Scroll/Select switch
to select the parameter, then enter the required setting(s).

Adjustments

P o w e r 5 0 W
L i n e I n - 1 3 d B m
L i n e O u t - 1 3 d B m
E x i t > >

RF power between 5 W to 50 W.
Audio line in level between -30 to +10 dBm.
Audio line in level between -30 to +10 dBm.

I n h i b i t O F F
P T T O F F
T X T i m e o u t 1 8 0 s
E x i t < < > >

M o d D e p t h 8 5 %
A n t C / O D e l O N
S q u e l c h - 1 0 7 d B m
E x i t < < > >

R F P r e - A t t e n O F F
S q l D e f e a t O F F
S q l N / C o m p O N
E x i t < < > >

On or Off.
On (key), off (de-key).
2 to 510 s.

5 to 95%.
On or Off.

-114 to -60dBm in 1dB steps. With the RF
pre-attenuator selected, the range is -108 to

-54 dBm.

Off or On.
Off or On.
Off or On.

S q l C a r r O / R O F F
K e y P r i o r i t y L - R
L o c a l P T T E N
E x i t < < > >

R e m o t e P T T E N
R e m P h a n P T T E N
B a c k
E x i t < <

Page 21

Off or On.
Local-remote or Remote-local.
Enabled or Disabled.

Enabled or Disabled.
Enabled or Disabled.

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Squelch Setting Options

The transceiver’s squelch facility is configured from the AM- Voice, or AM-MSK Settings screen. The
following fields are applicable to squelch operation.

Sql Defeat. The squelch defeat facility can be set to on or off.

❑ When set to on, the squelch facility does not operate.
❑ When set to off the transceiver’s squelch facilities are available.

Squelch. The squelch field sets the threshold; the default setting is -107 dBm.

❑ During periods of no reception, or when signals weaker tha n the threshold are

received, the transceiver is muted.

❑ When signals stronger than the squelch threshold are received, the squelch circuits

are defeated and reception is heard in the normal way.

Sql N/Comp. This field allows noise compensated squelch to be selected on or off. When this facility

is on, the squelch circuit s mute all signals weaker than the thres hold, and also mu te
signals stronger than the threshold that are excessively noisy.

Sql Carr O/R. The carrier override squelch facility is used in conjunction with the noise compensated

squelch facility. If too many noisy si gnals are being los t due to noise co mpensation,
carrier override c an be switched on to redu ce the squelch thresho ld by 10 dB. T he
default threshold of -107 dBm effectively becomes -97 dBm with carrier override
switched on. All signals stronger than -97 dBm, irrespective of the noise level, are then
heard in the normal way.

Table 7 Squelch Facility Settings

Required Squelch Operation Squelch Defeat

No squelch On Any Off Off

Squelch
(without noise compensation)

Noise compensated squelch Off Required threshold On Off

Noise compensated squelch
with carrier override squelch

Setting

Off Required threshold Off Off

Off Required threshold On On

Squelch Setting Sql N/Comp

Setting

Sql Carr O/R

Setting

Using the RF Pre-Attenuator

Selecting the RF pre-attenuator to On provides a 6 dB reduced sensitivity feature to improve co-location
performance where maximum sensitivity cannot be realised due to large unwanted signals

Page 22

Mode 2 Settings Screen

This is an advisory screen. Pressing OK returns the user to the Main screen.

M o d e 2 p a r a m e t e r s
a r e s e t v i a t h e
H L D C i n t e r f a c e

O K

Mode3 Settings Screen

This is an advisory screen. Pressing OK returns the user to the Main screen.

M o d e 3 p a r a m e t e r s
a r e s e t v i a t h e
T 1 / E 1 i n t e r f a c e

O K

Back to Transceiver
Main Page

Page 23

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Polarities Screens AM-Voice and AM-MSK

A number of remote indicatio n and contr ol signals c an be hard -wire connected to the trans ceiver. The
following paragraphs detail the signals applicable to each operational mode of the transceiver.

The Polarities screen is accessed from the Settings screen.

AM-Voice and AM-MSK Polarity Settings

R e a d y O u t S T D
E - B I T I n S T D

I n h i b i t I n S T D

E x i t > >

B I T S t a r t I n S T D
P T T R e f + 1 4 V
P T T I n S T D
E x i t > >

P h a n P T T I n S T D
P T T O u t S T D
F a s t P T T O u t S T D
E x i t < < > >

Each of thirteen polarity settings applicable to
AM-Voice and AM-MSK can be set to the default
STD (standard) setting or INV (inverted).

The signal connection s are shown in Table 8 on

page 25 along with the conditi ons when STD or

INV is selected .
The settings for the PTT Reference voltage are

also shown in Tabl e 8 on page 25.

E x t V S W R I n S T D
M A R C S q l O u t S T D
F A C S q l O u t S T D
E x i t < < > >

P h a n S q l O u t S T D
S q l D e f I n S T D
B a c k
E x i t < <

Page 24

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Table 8 AM-Voice and AM-MSK Polarity Settings

Signal Connector Polarity set to STD Polarity set to INV

Ready Out Facilities, pin 13 An open collector grounded

output when the radio is ready
to transmit and no BIT faults
are detect ed.

E-BIT In Facilities, pin 2 TTL input. 0 V indicates an

external fault.

Inhibit In Facilities, pin 10 TTL input. 0 V inhibits receiver

operation.

BIT Start In Facilities, pin 11 TTL input. 0 V initiates an

interruptive BIT test.

PTT In MARC Audio, pin 8 Active when input differs from

reference by more than ±10 V.
Inactive when input dif fers from
reference by less than ±1 V.
Maximum input l evel ±60 V
with respect to reference. Inpu t
will draw no more than 6 mA,
requires at least 1 mA to
operate.

Phantom PTT In MARC Audio, pin 4 Active when input differs from

reference by more than ±10 V.
Inactive when input dif fers from
reference by less than ±1 V.
Maximum input l evel ±60 V
with respect to reference. Inpu t
will draw no more than 6 mA,
requires at least 1 mA to
operate.

An open collector high
impedance output when the
radio is ready to transmit and
no BIT faults are detected.

TTL input. 5 V indicates an
external fault.

TTL input. 5 V inhibits receiver
operation.

TTL input. 5 V initiates an
interruptive BIT test.

Active when input differs from
reference by less than ±1 V.
Inactive when input di ffers from
reference by more than +10 V.
Maximum input level +60 V
with respect to reference. Inp ut
will draw no more than 6 mA,
requires at least 1 mA to
operate.

Active when input differs from
reference by less than ±1 V.
Inactive when input di ffers from
reference by more than +10 V.
Maximum input level +60 V
with respect to reference. Inp ut
will draw no more than 6 mA,
requires at least 1 mA to
operate.

PTT Out Facilities, pin 3 Grounding solid state relay.

+60 to -60 V, ac or dc, 100 m A
max, n/o. Activated 20 ms
(±1 ms) before the start of the
power ramp up to allow for the
antenna relay to pull-in time.

Fast PTT Output
(antenna
changeover)

External VSWR
Input

MARC squelch
out

MARC Audio, pin 3 Open collector NPN transistor

grounding output, 200 mA max,
n/o.

Facilities, pin 4 TTL input. 0V active. TTL input. 5 V active.

MARC, pin 4
MARC audio, pin 6

Normally open relay contact
that closes to give a 0 V output
when the squelch circuits are
defeated (aircraft calling).

Page 25

Grounding solid state relay.
+60 to -60 V, ac or dc, 100 mA
max, n/c. Activated 20 ms
(±1 ms) before the sta rt of the
power ramp up to allow for the
antenna relay to pull-in time.

Open collector NPN transistor
grounding output, 20 0 mA max,
n/c.

Normally closed (0 V output)
relay contact that opens when
the squelch circuits are
defeated (aircraft calling).

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Table 8 AM-Voice and AM-MSK Polarity Settings

Signal Connector Polarity set to STD Polarity set to INV

FAC squelch out

Phantom squelch
out

Squelch defeat in

PTT Ref
.

Facilities, pin 5 Normally open relay contact

that closes when the squel ch
circuits are defeated (aircraf t
calling). The relay cont ac t can
be configured to switch any
potential between -60 V and
+60Vdc.

MARC, pin 2
MARC audio, pin 1

Facilities pin 7 TTL input. 0 V switches off the

-

Phantom Squelch. Normally
open relay contact that closes
to connect a 0 V phantom
potential to the audio lines
when the squelch circuits are
defeated (aircraft calling).

squelch circuits.
PTT Ref can be set to +14 V,

0 V or -14 V. PTT stat e is:
+14 V Ref. key ≤+4 V

≥+24 V
unkey +13 to +15 V

0 V Ref. key ≤-10 V
≥+10 V
unkey -1 V to +1 V

-14 V Ref. key ≤-24 V
≥-4 V
unkey -13 to -15 V

Maximum input l evel ±60 V
with respect to reference. Inpu t
will draw no more than 6 mA,
and requires at least 1 mA to
operate.

Normally closed relay contact
that opens when the squelch
circuits are defeated (aircraft
calling). The relay contact can
be configured to switch any
potential between -60V and
+60Vdc.

Phantom Squelch. Normally
closed relay con tact connecting
a 0 V potential to the audio
lines that opens when the
squelch circuits are defeated
(aircraft calling).

TTL input. 5 V switches off the
squelch circuits.

PTT Ref ca n be set to +14 V,
0 V or -14 V. PTT state is:

+14 V Ref. unkey ≤+4 V
≥+24 V
key +13 to +15 V

0 V Ref. unkey ≤-10 V
≥+10 V
key -1 V to +1 V

-14 V Ref. unkey ≤-24 V
≥-4 V
key -13 to -15 V

Maximum input level ±60 V
with respect to reference. Inp ut
will draw no more than 6 mA,
and requires at least 1 mA to
operate.

Page 26

Mode 2 and Mode 3 Polarity Settings

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Main Page

R e a d y O u t S T D
E - B I T I n S T D
E x t V S W R I n S T D
E x i t > >

Each of the three polarit y settings applicable to
Mode 2 and Mode 3 can be set to the default STD
(standard) setting or INV (inverted).

The signal connections are shown in Table 9
along with the conditions when STD or INV is
selected.

B a c k
E x i t

< <

Table 9 Mode 2 and Mode 3 Polarity Settings

Signal Connector Polarity set to STD Polarity set to INV

Ready Out Facilities, pin 13 An open collector grounded

output when the radio is
ready to transmit and no BIT
faults are detected.

An open collector high impedance
output when the radio is ready to
transmit and no BIT faults are
detected.

E-BIT In Facilities, pin 2 TTL input. 0 V indicates an

external fault.

External

Facilities, pin 4 TTL input. 0 V active TTL input. 5 V active.

VSWR Input

TTL input. 5 V indicates an
external fault.

Page 27

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AM-Voice and AM-MSK BIT Screen

The AM-Voice and AM-MS K BIT screen is a accessed from the Control sc reen. Furth er informatio n on
the BIT screen can be found in the Maintenance section.

B I T I n i t i a t e
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
E x i t > >

D C S u p p l y O N
S u p p l y 2 8 V
S y n t h L o c k P A S S
E x i t < < > >

P A T e m p 5 0 d e g C
P A C o o l i n g P A S S
B a s e b a n d P A S S
E x i t < < > >

Select to initiate BIT test.
Shows elapsed time 0:00 to 99999:59 (Hrs:Min).
Shows state of ac supply (On or Off).

Shows state of dc supply (On or Off).
dc supply 0 to 40 V, <21.6 V Alert, <19 V Alarm.
Pass or Fail (Out-of-Lock).

PA temperature (range -20°C to +150°C).
Pass or Fail.
Pass, Fail or Not Connected.

R F D r i v e P A S S
P A O u t p u t P A S S
P A L o o p P A S S
E x i t < < > >

M o d D e p t h P A S S
V S W R P A S S
L o o p E r r o r P A S S
E x i t < < > >

T X R F F i l t P A S S
R X R F F i l t P A S S
S e n s i t i v i t y P A S S
E x i t < < > >

Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.

Pass, Fail or Not Tested.
Pass or Fail.
Pass or Fail.

Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.

Page 28

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Main Page

I F F i l t e r s P A S S
A u d i o P A S S
D S P 1 P A S S
E x i t < < > >

D S P 2 P A S S
X i l i n x 1 P A S S
X i l i n x 2 P A S S
E x i t < < > >

E E P R O M P A S S
S t a r t U p P A S S
C a l i b r a t i o n P A S S
E x i t < < > >

Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass or Fail.

Pass or Fail.
Pass or Fail.
Pass or Fail.

Pass or Fail.
Pass or Fail.
Pass or Fail.

U n k e y e d P w r P A S S
E - B I T P A S S
M A R C A C T I V E
E x i t < < > >

H D L C I N A C T I V E
T 1 / E 1 I N A C T I V E
B a c k
E x i t < <

Pass or Fail.
Pass or Fail.
Active or Inactive.

Active or Inactive.
Active or Inactive.

Page 29

Mode 2 and Mode 3 BIT Screen

The Mode 2 and Mode 3 BIT screen is accessed from the Control screen.

Back to Transceiver
Main Page

E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
D C S u p p l y O N
E x i t > >

S u p p l y 2 8 V
S y n t h L o c k P A S S
P A T e m p 5 0 d e g C
E x i t < < > >

P A C o o l i n g P A S S
V S W R P A S S
L o o p E r r o r P A S S
E x i t < < > >

Shows elapsed time 0:00 to 99999:59 (Hrs:Min).
Shows state of ac supply (On or Off).
On or Off.

Shows value of dc supply.
Pass or Fail.
Indicates the PA temperature.

Pass or Fail.
Pass, Fail or Not Tested.
Pass or Fail.

D S P 1 P A S S
D S P 2 P A S S
X i l i n x 1 P A S S
E x i t < < > >

X i l i n x 2 P A S S
E E P R O M P A S S
S t a r t U p P A S S
E x i t < < > >

C a l i b r a t i o n P A S S
E - B I T P A S S
M A R C A C T I V E
E x i t < < > >

Pass or Fail.
Pass or Fail.
Pass or Fail.

Pass or Fail.
Pass or Fail.
Pass or Fail.

Pass or Fail.
Pass or Fail.
Active or Inactive.

Page 30

Back to Transceiver
Main Page

H D L C A C T I V E

T 1 / E 1 A C T I V E

B a c k

E x i t < <

Active or Inactive.
Active or Inactive.
Active or Inactive.

Page 31

Software Configuration Screens

Software configuration screens are as follows:

Back to Transceiver
Main Page

T 6 V H F 5 0 W T X
1 1 8 - 1 3 6 . 9 7 5 M H z

E x i t > >

B o o t S o f t w a r e
6 5 - x x x x x x x x / v v

E x i t < < > >

B a s e S o f t w a r e
6 5 - x x x x x x x x / v v

E x i t < < > >

Second line variation for WB radios reads
112-155.975 MHz.

65-xxxxxxxx represents the software part
number and /v v represents its version.

65-xxxxxxxx represents the software part
number and /v v represents its version.

M o d e S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]
E x i t < < > >

F i l l 1 S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]
E x i t < < > >

F i l l 2 S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]
E x i t < < > >

Current mode running. 65-xxxxxxxx
represents the software part number and /v v
represents its version.

65-xxxxxxxx represents the software part
number and /v v represents its version.

65-xxxxxxxx represents the software part
number and /v v represents its version.

Page 32

Back to Transceiver
Main Page

F i l l 3 S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]

F i l l 4 S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]

65-xxxxxxxx represents the software part
number and /v v represents its version.

65-xxxxxxxx represents the software part
number and /v v represents its version.

Band Edges

The frequency rang e of the transceiver is 118 to 136.9 75 MHz for the B6550/NB v ersion, or 112 to

155.975 MHz for the B6550/WB version.
If required, reception c an be limi ted to either on e or two smalle r parts o f the frequency band by se tting

the band edges BE1 to BE4. Reception is possible between BE1 and BE2 frequencies, and frequencies
between BE3 and BE4.

B E 1 1 1 8 . 0 0 0 M H z
B E 2 1 3 6 . 9 7 5 M H z
B E 3 1 1 8 . 0 0 0 M H z
E x i t > >

The Band Edge screen is accessed from the
Control screen.

Band edge frequencies can be set only in
increments of 25 kHz.

If the transceiver is requi red to operate over the

B E 4 1 3 6 . 9 7 5 M H z

full range, the band edge parameters must be set
to the lowest and highest values in the range (see

Table 10).

E x i t < <

Table 10 Band Edge Values

BE1 BE2 BE3 BE4

B6550/NB set so that the full frequency range can be received. 118.000 136.975 118.000 136.975
B6550/WB set so tha t the fu ll freq uency range can be recei ved. 1 12.000 155.975 1 1 2.000 155.975

Example: Transceiver set to transmit and receive only those
frequencies in the range 120 to 130 MHz.

Example: Transceiver set to transmit and receive only those
frequencies in the ranges 120 to 125MHz and 130 to
135 MHz.

120.000 130.000 120.000 130.000

120.000 125.000 130.000 135.000

Page 33

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Main Page

BIT Status Warning Screens

The following shows some ex ample BIT scr eens. These scre ens alternate with the Main Screen when
an alert or alarm condition is present. Only the parameters causing the alert or alarm are displayed, and
if both an alert and alarm cond ition exists simultaneously only the alarm information is displayed. If
multiple parameters are signallin g an alert or alarm co ndition, multi ple screens ar e used to display the
status alternating with the Main Screen.

A L E R T

S u p p l y 2 1 V

A L E R T
R F P o w e r R e d u c e d
L o o p E r r o r
S u p p l y 2 1 V

A L E R T
R F P o w e r R e d u c e d
P A T e m p 8 5 d e g C

Alarm indicator flashing

No RF power reduction.

Alarm indicator flashing

RF power reduced between 1 and 3 dB.

Alarm indicator flashing

RF power reduced between 1 and 3 dB.

A L A R M
S y n t h L o c k F a i l

A L A R M
R F P o w e r R e m o v e d
L o o p E r r o r F A I L
S u p p l y 1 8 V

Alarm indicator on

Synth Lock failu re (showing a single cause of
alarm).

Alarm indicator on

RF power shut do wn (sho wing m ultipl e ca uses
of alarm).

Page 34

Table 11 Functions and Parameters

Back to Transceiver
Main Page

Function

Front

Panel

FREQUENCY

Change frequency

FREQUENCY CHANNELS

Store/Recall preset
frequency channels

SETTINGS

Set modulation
mode

Radio Settings (AM Modes):

Set RF output power

Set audio input line
level

Set audio output line
level

✔✔✔ ✔ ✔ ✔

✔✔✔ ✔ ✗ ✗

✔✔✔ ✔ ✔ ✔

✔✔✔ ✔ ✔ ✔

✔✔✔ ✗ ✔ ✗

✔✔✔ ✗ ✔ ✗

VFP MARC T6

Controller

T1/E1 HDLC

Default Setting

118.0 00 MH z

-

AM-Vo ice

50 W

-13 dBm

-13 dBm

Set inhibit on or off

PTT test facility
on (key) off (de-key)

Set Tx time out

Set modulation
depth

Set mute on or off
(AM-Voice only)

Set VOGAD on
or off
(AM-Voice only)

Set antenna C/O
delay on or off

Set frequency offset
(AM-Voice only)

Squelch Level

RF pre-attenuator
On or Off

✔✔✔ ✗ ✗ ✗

✔✔

View

only

✗✔✗

✔✔✔ ✗ ✔ ✗

✔✔✔ ✔ ✔ ✗

✔✔✔ ✗ ✗ ✗

✔✔✔ ✗ ✗ ✗

✔✔✔ ✗ ✗ ✗

✔✔✔ ✗ ✗ ✗

✔✔✔ ✔ ✗ ✗

✔✔✔ ✗ ✗ ✗

Off

Off

180 s

85%

On

On

AM-Voice - On

AM-MSK - Off

0 (No offset)

-107 dBm

Off

Page 35

Continued >>

Table 11 Functions and Parameters (Continued)

Back to Transceiver
Main Page

Function

Set squelch defeat
on or off

Set squelch noise
compensation
on or off

Set squelch carrier
override on or off

Audio AGC on or off

Loudspeaker
on or off

Set frequency step
size
(AM-Voice only)

Set microphone type
(active or passive)
(AM-Voice only)

Set keying priority
(local or remote)

Front

Panel

VFP MARC T6

Controller

T1/E1 HDLC

✔✔✔ ✔ ✗ ✗

✔✔✔ ✗ ✗ ✗

✔✔✔ ✗ ✗ ✗

✔✔✔ ✗ ✗ ✗

✔✔

View
state

✗✗✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

Default Setting

Off

On

Off

On

On

25 kHz

Passive

Local-Remote

Enable or disable
local PTT

Enable or disable
remote PTT

Enable or disable
remote phantom
PTT

Self Receive
(transmit audio on
line output)

Radio Settings (Digital Modes):

MAC TM1
(inter access delay)

MAC TM2
(channel busy)

MAC p (persistance)
MAC M1 (maximum

number of access
attempts)

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✗✔✗ ✗ ✗ ✔

✗✔✗ ✗ ✗ ✔

✗✔✗ ✗ ✗ ✔

✗✔✗ ✗ ✗ ✔

Enabled

Enabled

Enabled

Off

2.5 ms

60 s

13/256

135

Page 36

Continued >>

Table 11 Functions and Parameters (Continued)

Back to Transceiver
Main Page

Function

Scramble vector

Tx enable

Polarities:

Ready out

Set PTT input
polarity
(AM modes only)

Set phantom PTT
input polarity
(AM modes only)

Set PTT reference
voltage
(AM modes only)

Set PTT output
polarity
(AM modes only)

Front

Panel

VFP MARC T6

Controller

T1/E1 HDLC

✗✔✗ ✗ ✗ ✔

✗✔✗ ✗ ✗ ✔

✔✔

✔✔

✔✔

✔✔

✔✔

View
state

View
state

View
state

View
state

View
state

✗✗✗

✗✗✗

✗✗✗

✗✗✗

✗✗✗

Default Setting

4D4B
19787

On

STD

STD

STD

+14 V

STD

Set fast PTT
antenna changeover
output polarity
(AM modes only)

Set external VSWR
input polarity
(All modes)

Set Inhibit input
polarity
(AM modes only)

BIT interruptive test
input polarity
(AM modes only)

E-bit input polarity
(All modes)

Squelch output
polarity at the
MARC connector

✔✔

✔✔

✔✔

✔✔

✔✔

View
state

View
state

View
state

View
state

View
state

✗✗✗

✗✗✗

✗✗✗

✗✗✗

✗✗✗

✔✔ ✗ ✗ ✗ ✗

STD

STD

STD

STD (active low)

STD (active low)

STD (n/o)

Continued >>

Page 37

Table 11 Functions and Parameters (Continued)

Back to Transceiver
Main Page

Function

Squelch output
polarity at the
Facilities connector

Phantom squelch
output polarity

Squelch defeat input
polarity

Band Edges:

Set band edges

Reference Frequency:

Adjust transceiver’s
reference frequency

LCD Backlight:

Front

Panel

VFP MARC T6

Controller

T1/E1 HDLC

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

✔✔ ✗ ✗ ✗ ✗

Default Setting

STD (n/o)

STD (n/o)

STD

118.000 & 136.975 MHz
or

112.000 & 155.975 MHz

-

Adjust LCD
backlight

BIT:

Initiate BIT
interruptive test

Standby:

Enter and exit
standby facility

Software Configuration:

View the
transceiver’s
sofeware
configuration

LOCK FACILITIES:

Front panel lock ✗✔✗ ✗ ✗ ✗ Off
MARC lock ✗✔✗ ✗ ✗ ✗ Off
T1/E1 lock ✗✔✗ ✗ ✗ ✗ Off

✔✔ ✗ ✗ ✗ ✗

✔✔✔ ✔ ✗ ✗

✔✔✔ ✔ ✗ ✗

✔✔ ✗ ✗ ✔ ✔ -

30 s

-

Not in Standby

HDLC lock ✗✔✗ ✗ ✗ ✗ Off

Page 38

Installation Procedures

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This document gives the installation procedures applicable to the

T6TR VHF Multimode Transceiver.

Page 1

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WARNING Dangerous Voltages

The instructions given in this section involve connecting dangerous voltages to the
transceiver. The instructions detailed in this document must be carried out only by suitably
qualified personnel.

WARNING

Antenna Radiation

The antenna used with the transceiver must be installed such that the resultant radiated field
strength is below 10 W/m² in areas normally accessible to personnel.

WARNING

ESSDs

The T6TR transceiver's circuitry contains Electrostatic Sensitive Devices (ESSDs).
Personnel must be aware of the precautions necessary to prevent damage to such devices.
During installation all precautions necessary to prevent ESSD damage must be taken.

Caution Unauthorized Modifications

Changes or modifications made to this equipment that are not expressly approved by
Park Air, or parties authorized by Park Air, could void the user ’s authority to operate the
equipment.

Introduction

The procedures in this document describe how to install a T6TR transceiver. The procedures necessary
during installation are listed in Table 1 and it is recommended that they be completed in the order shown.

Table 1 Installation Procedures

Procedure Reference

1 Perform an initial inspection of the transceiver. see page 4
2 Antenna configuration (if required). see page 4
3 Fit the transceiver into an equipment cabinet. see page 6
4 Connect the remote facilities (as required). see page 7
5 Fit the correct ac input fuse. see page 22
6 Connect the chassis stud to the cabinet or system earth. see page 22
7 Connect the ac supply (if required). see page 22
8 Connect the dc supply (if required). see page 23

Page 2

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Fuses and Connectors

The following list details the radio’s supply fuses and the connectors. Some of the connectors (depending
on your particular configuration) are required during installation.

Component Type Park Air Part Number

Fuses:

AC input fuse, F2, for 110/120 V input
AC input fuse, F2, for 220/230 V input

DC input fuse 15A size 0 29-01350201

Connectors:

AC supply connector IEC 20-02030102
DC supply connector XLR3 socket 20-01030106
Antenna connector N-type plug 19-01030301
MARC connector 9-way D-type plug Plug: 20-01090100

MARC audio RJ48 plu g 20K01080100
MARC data RJ48 plu g 20K01080100
Facilities connector 15-way D-type plug Plug: 20-01150100

HDLC connector RJ48 plug 20K01080100
T1/E1 connector RJ48 plug 20K01080100
Reference connector BNC to SMB 2 metre long lead 17K11000004

T4A, 125V, UL
T4A, 250V, IEC

29C11120102S
29E01120108S

Cover: 20-09090101

Cover: 20-09150101

Microphone/Diagnostics connector 7-pin DIN plug to 9-way D-type, radio

to PC interconnection lead

17E12600001

Page 3

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Initial Inspection of the Transceiver

On receipt of the transceiver from Park Air, remove all transit packaging and check that there is no transit
damage. If damage is evident, contact Park Air immediately and retain the original transit packaging.

The following items are included with the transceiver:

❑ Item 1. One copy of the T6 VHF Radios User Guide CD (part number 31-36T62VCD)
❑ Item 2. Packing box.

Antenna Configuration

The transceiver can be operated using a single antenna, or separate transmit and receive antennas (see

Fig 4 to Fig 9). For single antenna operatio n, the antenna’s feeder c able is c onnect ed to the re ar panel

TX/RX antenna connector. For separate antenna operation, the transmit feeder cable is connected to the
TX/RX antenna connector and the receive feeder cable is connected to the RX antenna connector.

Fig 1 Antennas

TX/RX Antenna

RX Antenna

ANTENNA

DANGER HIGH

RF VOLTAGES

CONNECT
ANTENNA

BEFORE

USE

T1/E1 HDLC

RX

ANTENNA

INTERNALLY

( )

SELECTABLE

MARC
DATA

MARC
AUDIO

MARC FACILITIES

~ 110 - 240V ( +10%) 4A

RATINGS

AC SUPPLY

48 - 62Hz

110-240V T4 A 250V IEC

110V - 120V T4A 125V U L

POWER 400VA max

DC SUPPLY

21.6 - 32V 10A

SEE INSTALLATION INSTRUCTIONS BEFORE

CONNECTING SUPPLIES

DISCONNECT SUPPLIES WHEN NOT IN USE

SUPPLY

FUSE F2

FUSE F1

F15A 32V

FUSE F1

AC SUPPLY

FUSE F2

DC SUPPLY

Fig 1 Antennas

Internal RF cables must be correctly positioned to suit the required configuration. This is normally carried
out at Park Air prior to shipment. Should the configuration be required to change on installation, perform
the procedure detailed below. Note that if this procedure is use d at any other time take note of the
warning preceding the instructions.

Page 4

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Changing the Antenna Configuration (if required)

WARNING Dangerous Voltages

Dangerous voltages are present within the transcei ver. Care must be taken b y personnel to avoid
accidental contact with exposed circuitry when the bottom cover is removed and power is applied
to the radio

Proceed as follows:

(1) Remove the 15 captive screws securing the bottom cover to the mainframe.
(2) With the cover removed locate the PA Control/Rx RF module.
(3) Locate CN7 and CN12 on the PA Control/Rx RF module (see Fig 2).
(4) For single antenna configuration, connect the Rx antenna RF cable to CN12 (Park). Connect the

adjacent RF cable from the PA module to CN7.

(5) For dual antenna configuration, connect the Rx antenna RF cable to CN7. Connect the adjacent

RF cable from the PA module to CN12 (Park).

CN7

CN12
PARK

Fig 2 Antenna Configuration

RX Antenna

Fig 2 Antenna Configuration

(6) When configured, replace the transceiver’s bottom cover using the 15 captive screws.

Page 5

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Fitting a Radio into an Equipment Cabinet

Caution Mechanical Support

It is essential that the chosen mechanical installation provides adequate support along the
depth (front to rear) of the unit. The transceiver must not be supported by the front panel;
doing so can cause damage.

The transceiver can b e installed on telescopic slides, or on fixed ru nners, within a standard 483 mm
(19 inch) equ ipm ent rack. M4 tapp ed hol es , each 10 mm deep (see Fig 3) are provided on each side of
the equipment to accept the slid es. Details of suitable tel escopic slid es and fixed runn ers are avail able
from Park Air.

When fitted in the rack, the transceiver's front panel must be secured to the cabinet’s chassis using four
M6 x 16 mm screws and plastic washers.

Fig 3 Slide Fittings

Front
Panel

29.0

41.7

47.0

152.8

207.5

232.2

430

All measurements in mm

Fig 3 Slide Fittings

88.9

378.2

390.9
399

450

Page 6

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o

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Connecting the Remote Equipment

Connection of externa l equipment dep ends on the c onfiguratio n required. The se configurati ons are as
follows:

❑ T6TR transceiver configured for local operation
❑ T6TR transceiver configured for remote operation
❑ T6TR transceiver configured for use with MARC
❑ T6TR Mode 2 configuration
❑ T6TR Mode 3 configuration.

Fig 4 to Fig 9 illustrate the various configurations.

Fig 4

Either a common Tx/Rx
antenna or separate Tx

and Rx antennas can be

T6T Transceiver

used

E-BIT
PTT relay
External VSWR
Squelch
Squelch common
Squelch defeat
Unregulated supply
Inhibit
BIT interrup tiv e test
RSSI
Ready
Tape

Facilities
Connector

Frequency Counter

required only for

maintenance

Reference
Connector

TX/RX Antenna

Connector

RX Antenna

Connector

Headset/Microphone/Diagnostics

Connector

Mic/Headset for local operation

Laptop (o r PC) requi red

nly for maintenance

Fig 4 Transceiver Configured for Local Operation

Page 7

T6T Transceiver

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Fig 5

Either a common Tx/Rx

antenna or separate Tx and

Rx antennas can be used

Rx Audio
Squelch

Unregulated supply

RS 422 Data

Tx Audio

PTT

Frequency Counter

required only for

maintenance

Note:
The unregulated sup ply an d R S 42 2
data connections may be used when
conn ecting to remote cont ro ll e r s
such as the Park Air T6 controller

MARC
Connector

MARC Audio
Connector

Reference
Connector

TX/RX Antenna

Connector

RX Anten na

Connector

Mic/Headset/Diagnostics

Connector

Mic/Headset for eng ineering us e

Laptop (or PC) required

only fo r maintenan c e

Fig 5 T6TR Transceiver Configured for Remote Operation

Page 8

RSE2

Equipment

Connector 1

Rx Audio

Squelch

Unregulated supply

RS422 data

T6TR Transceiver

MARC
Connector

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Fig 6

Either a common Tx/Rx ant enna or

separate Tx and Rx ante nnas can be

used

TX/RX Antenna

Connector

Equipment

Connector 3

Shows single channel conn ections at R SE2

Tx Audio

PTT

Frequency Counter

required only for

maintenance

Fig 6 T6TR Transceiver Configured for use with MARC

MARC Audio
Connector

Reference
Connector

RX Antenna

Connector

Headset/Microphone/Diagnostics

Connector

Mic/Headset for engineering use

Laptop (or PC) required

only for maintenance

Page 9

T6TR
Transceiver

MARC

Connector

MARC Audio

Connector

Fig 7

Receive lines + data

Transmit lines

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RSE2

Equipment Connector 1

Equipment Connector 3

T6TR
Transceiver

T6TR
Transceiver

T6TR
Transceiver

MARC

Connector

MARC Audio

Connector

MARC

Connector

MARC Audio

Connector

MARC

Connector

MARC Audio

Connector

Receive lines + data

Transmit lines

Receive lines + data

Transmit lines

Receive lines + data

Transmit lines

Equipment Connector 2

Equipment Connector 4

Equipment Connector 5

Equipment Connector 7

Equipment Connector 6

Equipment Connector 8

Fig 7 Transceiver to MARC RSE2 Connections

Fig 7 sh ows the connection convention when conn ecting transceivers to a single RSE2. Table 2 and

Table 3 detail the pin to pin connections.

Page 10

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Table 2 Transceiver to RSE2 Equipment Conne ctor 1, 2, 5 or 6

Transceiver MARC

9-Way D-type Conn ector

Pin Number

1Ground
2 Audio line out (+) Audio line L1 2
3 Audio line out (-) Audio line L2 3
4 Squelch indication
5 Unregulated supply

6Data in (+)
7 Data in (-) Data out (-) 7
8 Data out (+)
9 Data out (-) Data in (-) 9

Table 3 Transceiver to RSE2 Equipment Conne ctor 3, 4, 7 or 8

Transceiver

output

Signal at

Signal at RSE2 RSE2 Equipment

Ground 1

Mute indication 4
Unregulated

supply input
Data out (+) 6

Data in (+) 8

Connector Pin

Number

5

Transceiver MARC RJ48

Audio Connector Pin

Number

7 Ground
4 Audio line in (+) Audio line L1 2
5 Audio line in (-)
8PTT

Signal at

Transceiver

Signal at RSE2 RSE2 Equipment

Connector Pin

Number

Ground 1

Audio line L2 3
PTT 4

Page 11

T6TR Transceiver

Reference
Connector

Headset/Microphone/Diagnostics
Connector

HDLC

Connector

Fig 8

T1/E1

Connector

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Either a common Tx/Rx
antenna or sepa rate T x

and Rx antennas can

be used

TX/RX Antenna

Connector

RX Antenna

Connector

Facilities

Connector

Mode 2

Network Computer

Connects to the

Reference connector

Connects to the

eadset/Diagnostics

connector

Control and data

Frequency Counter

required only for

maintenance

Fig 8 T6TR Mode 2 Configuration

Page 12

T6TR Transceiver

Fig 9

Either a common Tx/Rx antenna or

separate Tx and Rx antennas can be

TX/RX Antenna

Connector

RX Antenna

Connector

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used

Mode 3

Network Computer

T1/E1

Connector

Control and data

Frequency Counter

required only for

maintenance

Reference
Connector

Mic/Headset/Diagnostics

Connector

Laptop (or PC) required only

Fig 9 T6TR Mode 3 Configuration

for maintenance

Page 13

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Connectors

Front and rear panel connector pin-outs are detailed in Table 4 to Table 11. The Reference connector is
described in text.

Front Panel Connectors

The front panel has two connectors; Headset/Microphone/Diagnostics connector and Reference
connector. These are illustrated in Fig 10.

Fig 10

Fig 10 Front Pan el

Headset/Microphone/Diagnostics Connector

The Headset/Microphone/Diagnostic connector is shown in Table 4. This connector is a self-locking
7-way DIN socket used for connecting a microphone, microphone/headset or computer.

Table 4 Headset/Microphone/Diagnostics Connector

Pin Number Signal Characteristic

1 Microphone ground 0 V
2 Transmit data (output) RS232. 1 15200baud, 8 data bits, 1 stop bit, no parity ,

no handshaking.
3 Microphone PTT (input) 0 V to PTT.
4 Receive data (input) RS232. 115200 baud, 8 data bits, 1 stop bit, no parity,

no handshaking.
5 Sidetone/headset drive

(output)

6 Microphone input (input) To ensure correct VOGAD operation, the following

7 Ground 0 V

The level is adjustable between 0and 3 V

peak-to-peak by using the volume control.

microphone input levels are required:

Passive setting: between 2 and 35 mV

Active setting: between 8 and 140 mV

Reference Connector

The Reference connector is an SMB plug used to moni tor the radio’s referen ce frequency. It monit ors
the frequency at a level of 100 mV (±50 mV) with less than -10 dBc harmonics.

Page 14

Rear Panel Connectors

The rear panel connectors are shown in Fig 11. These connectors are:

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❑ Antenna
❑ RX Antenna
❑ MARC
❑ MARC Audio
❑ MARC Data

❑ HLDC
❑ External Speaker
❑ Facilities
❑ ac Supply
❑ dc Supply

❑ T1/E1

Fig 11

ANTENNA

DANGER HIGH

RF VOLTAGES

CONNECT

ANTENNA

BEFORE

USE

RX

ANTENNA

INTERNALLY

( )

SELECTA BLE

T1/E1 HDLC

MARC
DATA

MARC
AUDIO

MARC FACILITIES

RATINGS

110V - 120V T4A 125V UL

CONNECTING SUPPLIES

FUSE F2

110-240V T4A 250V IEC

FUSE F1

F15A 32V

AC SUPPLY

48 - 62Hz

~ 110 - 240V ( +10%) 4A

POWER 400VA max

DC SUPPLY

21.6 - 32V 10A

SEE INSTALLATION INSTRUCTIONS BEFORE

DISCONNECT SUPPLIES WHEN NOT IN USE

SUPPLY

FUSE F1

AC SUPPLY

FUSE F2

DC SUPPLY

Fig 11 Rear Panel (Connectors)

The MARC Audio, MARC Data , T1/E1 and HLDC connectors are all RJ48 types. Fig 12 il lustrates an
RJ48 plug used with these connectors.

Pin 1

Fig 12

Numbering is shown as looking from the top of the connector.
[The top is being viewed when the lever is on the bottom.]

RJ48 Plug

Fig 12 RJ48 Modular Plug

Page 15

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Antenna Connectors

The antenna connectors are N-type sockets suitable for connecting 50 ohm antennas.

MARC Connector

The MARC connector is a 9-way D-type socket used for connecting to a MARC system via an RSE2. The
connector pin-out is detailed in Table 5

.

Table 5 MARC Connector

Pin Number Signal Characteristic

1 Ground 0 V
2

3
4 Squelch (output) Solid state relay, +60 to -60 V, ac or dc, 100 mA max,

5 Unregulated supply

6
7

8
9

Audio line out (+)

Audio line out (-)

(output)
Data in (+)

Data in (-)

Data out (+)
Data out (-)

Balanced 600 ohm, -20 to +20 dBm.
Phantom squelch (see Fig 14) - solid-state relay,
+60 to -60 V ac or dc, 100 mA max, configurable n/o or n/c.

Pair to pin 2.

configurable n/o or n/c.
This output is between 21.6 and 32 Vdc (nominally 24 V)

fused at 500 mA.
RS422 differential asynchronous data at 9600 baud. 8 data

bits, 1 stop bit, no parity, no handshaking.

RS422 differential asynchronous data at 9600 baud. 8 data
bits, 1 stop bit, no parity, no handshaking.

Note ...

The line level figures shown for the MARC and MARC Audio connectors are the limits when testing
the transceiver with sine wav e modula tion; the line level will be 10 dB ab ove the lin e level setting.
See the information supplied under the heading ‘Line Level Settings’ in the Operation section.

Page 16

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MARC Audio Connector

The MARC Audi o connector is an 8-way RJ48 socket. The connector pin-out is detailed in Table 6.

Table 6 MARC Audio Connector

Pin Number Signal Characteristic

1
2
3 Fast antenna

4
5

6 Squelch

7Ground 0 V.
8 PTT (input) Active when input dif fer s from referen ce by more than

Audio line out (-)
Audio line out (+)

changeover/PTT
Audio line in (+)
Audio line in (-)

(output)

Balanced 600 ohm -20 a nd +20 dBm. Phantom
squelch (see Fig 14) - solid-state relay, +60 to -60 V,
ac or dc, 100 mA max, configurable n/o or n/c.

Open collector NPN transistor grounding output,
200 mA max, configurable n/o or n/c.

Balanced 600 ohm input, -20 to +20 dBm.
Phantom PTT (see Fig 13) - active when input differs
from reference by more than ±10 V. Inactive when
input differs from reference by less than ±1 V.
Maximum input level ±60 V with respect to reference.
Input will draw no more than 6 mA, requires at least
1 mA to operate. Configurable active high or low.
Common reference to all inputs programmable to
+14, 0 or -14 V (±1 V).

Solid state relay, +60 to -60 V, ac or dc, 100 mA max,
configurable n/o or n/c.

±10 V. Inactive when input differs from reference by
less than ±1 V. Maximum input level ±60 V with
respect to reference. Input will draw no more than
6 mA, requires at leas t 1 m A t o o pe r ate. Con figurable
active high or low. Common reference to all inputs
programmable to +14, 0 or -14 V (±1 V).

Page 17

Fig 13

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T6TR Transceiver

Solid state

relay

PTT

Maximum signal level ±60 V

with respect to transmitter

reference.

T6TR Transceiver

Audio lines with phantom PTT

signal superimposed

Internal Sensing Circuit

Reference can be configured as +14 V, 0 V
or -14 V from the Polarities screen.
With STD selected, PTT active when input
differs from reference by more than ±10 V.
PTT inactive when input differs from
reference by less than ± 1 V.
With INV selected, PTT active when input
differs from reference by less than ±1 V. PTT
inactive when input differs from reference by
more than ±10 V.

For example, to use 0 volt as the keying
potential with STD polarity, set the reference
to +14 V or -14 V.

Fig 13 Example Phantom PTT Keying Diagram

Fig 14

Solid state

relay

Relay = 100 mA maximum.
Can be configured as normally open, or
normally closed from the Polarities screen.

Fig 14 Example Phantom Squelch Indication Diagram

Audio lines with phantom

squelch signal superimposed

Squelch Indicator

R

V

The pull-up voltage should be in the

range -60 to +60 V ac or dc.

Page 18

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MARC Data Connector

The MARC Data connector is an 8-way RJ48 socket. The connector pin-out is detailed in Table 7.

Table 7 MARC RJ48 Data Connector

Pin Number Signal Characteristic

1
2

3 Not connected ­4

5
6 Remote Supply ON/OFF

7 Ground 0 V.
8 Unregulated supply

Data in ­Data in +

Data out +
Data out -

(input)

(output)

RS422 differential asyn chronous da ta, 9600 baud,

8 data bits, 1 stop bit, no parity, no handshaking.

RS422 differential asyn chronous da ta, 9600 baud,

8 data bits, 1 stop bit, no parity, no handshaking.

0 V to switch off.

Note: Rear panel switch must be in ON position for

this function to operate.

This output is between 21.6 and 32 Vdc (nominally

24 V) fused at 500 mA.

T1/E1 Connector

The T1/E1 connector is an 8-way RJ48 socket used for connecting to a Mode 3 network computer. The
connector pin-out is detailed in Table 8.

Table 8 T1/E1 Connector

Pin Signal Characteristic

1 RRing

(input)

2RTip

(input)

3 Not connected ­4TRing

(output}

5TTip

(output)

6 Not connected ­7 Not connected ­8 Not connected -

T1 - Balanced 100 ohm (±10%), 1.544 Mbits per second (±50 ppm),
AMI/B8ZS Coding.

E1 - Balanced 120 ohm (±10%), 2.048 Mbits per second (±50 ppm),
AMI/HDB3 Coding.

Protected with 28 V dif ferential and common mo de c la mp and 1.2 5 A
fuse in each line.

T1 - Balanced 100 ohm (±10%), 1.544 Mbits per second (±50 ppm),
AMI/B8ZS Coding.

E1 - Balanced 120 ohm (±10%), 2.048 Mbits per second (±50 ppm),
AMI/HDB3 Coding.

Protected with 28 V dif ferential and common mo de c la mp and 1.2 5 A
fuse in each line.

Page 19

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HDLC Connector

The HDLC connector is an 8-way RJ48 socket used for connecting to a Mode 2 network computer. The
connector pin-out is detailed in Table 9.

Table 9 HDLC Connector

Pin Signal Characteristic

1 HDLC RX A

(input)

RS422 differential synchronous data, 128 kbytes per second
±50 ppm.2 HDLC RX B

(input)

3 HDLC CL A

(output)

4 HDLC TX B

(output)

(output)

6 HDLC CL B

(output)
7Ground 0 V.
8 Unregulated Supply

(output)

RS422 differential synchronous data, 128 kbytes per second
±50 ppm.

RS422 differential synchronous data, 128 kbytes per second
±50 ppm.5 HDLC TX A

RS422 differential synchronous data, 128 kbytes per second
±50 ppm.

21.6 to 32 V, fused at 500 mA.

External Speaker

The External Speaker conn ector is a 3.5 mm stere o jack used for conne cting t o an e xternal speak er to
provide sidetone on the transceiver. This speaker should be a high impedance active type.

Table 10 External Speaker

Pin Signal Characteristic

Tip Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Ring.

Ring Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Tip.

Sleeve Ground 0 V.

Page 20

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Facilities Connector

The Facilities conne cto r is a 15 -way D-type fi ltered s ocket used fo r connec ting t o assoc iated pa rts o f a
system. The connector pin-out is detailed in Table 11.

Table 11 Facilities Connector

Pin Number Signal Characteristic

1Ground 0V.
2 E-BIT (input) An external BIT input that connects from any ancillary equipment

having a compatible BIT alarm output.
When this input is activ e, the tran sc eiver’s fron t p a nel Alarm ind ic ato r

flashes and an E-BIT message is displayed on the LCD. The input is
TTL having a 4.7 kohm pull-up resistor to 5 V. The input is
configurable from the front panel to be active high or low.

3 PTT (output) Grounding solid state relay. +60 to -60 V ac or dc, 100 mA max,

configurable n/o or n/c. Ac tivated 35 ms (± 1 ms) befo re the st art of the
power ramp up to allow for the antenna relay pull in time.

4 External VSWR (input) TTL input with 4.7 kohm pull-up to 5 V. Configurable active high or

low.

5 Squelch (output) Solid state relay linked to pin 6. +60 to -60 V ac or dc, 100 mA max,

configurable n/o or n/c.

6 Squelch common

(output)
7 Squelch defeat (input) TTL with 4.7 kohm pull-up to 5 V. Configurable active high or low.
8Ground 0 V.
9 Unregulated supply

(output)

10 Inhibit (Input) TTL with 4.7 kohm pull-up to 5 V. Configurable active high or low.
11 BIT Interruptive test

(input)

12 RSSI (output) 0 to 10 V.
13 Ready (output) Open collector NPN transistor grounding output, 200 mA max,

14 Tape (output) 0 dBm fixed output into 600 ohm for 90% modulation depth.
15 Reserved (output) Open collector NPN transistor grounding output, 200 mA max,

Solid state relay linked to pin 5.

21.6 to 32 V, fused at 500 mA.

TTL with 4.7 kohm pull-up to 5 V. Configurable active high or low.
Must be asserted for >300 ms.

configurable n/o or n/c.

configurable n/o or n/c.

Page 21

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Fitting the Correct AC Input Fuse

The mains input fuse F2 is an integral pa rt of the rear panel a c connector (see Fig 11). The fuse type
must be correct for the local mains supply. Check the fuse fitted conforms to that detailed in Fig 15.

Fig 15

Earth

Line

For a mains input in the range 110 to 120 Vac,

Neutral

FS2
Spare Fuse

Fig 15 ac Input Fuse

fuse F2 should be rated T4A, 125V, UL.

For a mains input in the range 110 to 240 Vac,
fuse F2 should be rated T4A, 250V, IEC.

Chassis Stud Connection

WARNING Chassis Earth

A chassis stud is fitted to the transceiver's rear panel. This stud is used to connect the
equipment to the equ ipmen t r ack , o r t o t he us er's sy stem ear th poi nt. Th e s tud must no t be
used as the safety earth.

In order not to compromise the transceiver’s Electromagnetic Compatibility (EMC) the chassis stud,
marked and fitted to the rear panel (see Fig 11) must be connected to the equipment rack (if a rack
is being used) or to the user's system earth point. The connection should be made using a single tri-rated,
green-and-yellow c able having a cross-sectional are a of 2.5 mm

2

. The cable should have CSA and
UL1015 approval, and be connected to the chassis stud through an M6 eyelet (for example, Park Air part
number 20-08010103).

Failure to comply with this instruction could result in non-compliance with the European

Commission EMC Directive 89/336/EEC.

AC Supply Connection

WARNING Dangerous Voltages

The equipment is permanently connected to the mains supply when the mains connector is
attached. Switching the rear pan el Power switch to off does not isolate all internal circuits
from the mains supply. For this reason, a mains isolating switch should be fitted close to,
and easily accessible from, the transceiver's position. The isolation switch should isolate
both live and neutral supplies, be clearly labelled, and adequately rated to protect the
equipment.

Page 22

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WARNING Earth Connection

This equipment must be earthed. The earth terminal of the ac connector should be used as
the safety earth.

An ac input connector (see Fig 11 and Fig 15) is fitted to the equipme nt’ s r ear pane l. T he c able us ed to
connect between the equipm ent and the user’s ac power source shoul d be 3-core (to IEC 227) rated
250 Vac at 8 amps, and have a minimum cross-sectional area of 1.0 mm

2

per core. Park Air recommends
the use of polyvinyl chlo ride (PVC) insulated cable. The cable must be fi tted with the IEC approved
equipment connector (Park Air part number 20-02030102) supplied with the transceiver, and conform to
the following specification:

❑ If PVC insulated, be no t lighter than ordinar y polyviny l chlorid e sheathed fl exible c ord accord ing

to IEC publication 227 (designation H05 VV-F, or H05 VVH2-F).

❑ If rubber insulated, be of synthetic rubber and n ot lighter than ordinary toug h rubber-sheathed

flexible cord accordin g to IEC publi cation 24 5 titled ‘Rub ber Insulate d Cables of Rated V oltages
up to and Including 450/750 V (designation H05 RR-F)’.

The T6TR transceiver is a Class 1 equipment. The ac sup ply cable should have a green-an d-yellow
protective earthing conductor electrically connected to the protective earthing terminal of the equipment
connector and the mains plug. Park Air recommends the ac supply cable is colour coded in accordance
with the electrical appliance (colour code) regulations for the UK. That is:

❑ The core coloured green-and-yellow must be connected to the terminal in the plug that is marked

with the letter E or by the earth symbol or coloured green-and-yellow.

❑ The core coloured b lue must be connected to the termin al that is marked with the letter N or

coloured black.

❑ The core coloured brown m ust be connected to the termin al that is marked with the letter L or

coloured red.

DC Supply Connection

The transceiver ope rates from eithe r an ac, or a dc input supp ly. When both ac and dc are co nnecte d,
operation from the ac supply takes priority; automat ic change-over to the dc supp ly occurs if the ac
supply fails. On restoration of the ac supply, the equipment reverts to ac operation.

A dc input supply connector (see Fig 11) is fitted to the equipment's rear panel. The recommended
minimum rating of the dc supply cable is: 2-core having a cross-sectional area of 1.5 mm

2

per core. The

supply cable should be fitted with an XLR3 connector (Park Air part number 20-01030106).

Page 23

Switching On

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WARNING

Dangerous Voltages

When the POWER SWITCH is set to the Standby position, dangerous voltages are still present in
the transceiver's internal power supply circuitry. To ensure safe working, the transceiver must be
isolated from the ac and dc input supplies.

When installatio n is complete, the transceiver shoul d be switched on at the rear panel 2-way r ocker
Power switch. The Power switch is used to switch on, and switch off, power to the transceiver's circuitry
but does not remove power from the radio.

= Standby= On

Under normal circumstances this screen is displayed when the radio is switched on.

T 6 D i g i t a l R a d i o
( c ) 2 0 0 3 P a r k A i r

I n i t i a l i s i n g . . . .

. . . . . . . . . . . . . . .

The bottom row begins empty and dots are added as the initialisation progresses. When the initialisation
is complete the Main Screen is displayed.

Note ...

All radios have a standby function to extend power supply life when the radios are not required to be
operational. With the st andby fun ction enable d the tr ansceiv er is un able to tr ansmit or receiv e and
the display is blank. Rem ote control ser ial ports and the fr ont panel contro l knob remain active to
allow normal operation to be restored.

Page 24

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End of Document

Page 25

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Page 26

Maintenance

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This document gives the maintenance procedures applicable to the

T6TR VHF Multimode Transceiver.

Part 1 General Information
Part 2 Maintenance Procedur es
Part 3 Virtual Front Panel

Page 1

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General Inform ation

This section pr ovides the m aintenance personnel wi th sufficient information to maint ain and repa ir the
T6TR VHF transceiver. The standard maintenance policy regards the transceiver as a Line Replacement
Unit (LRU) which should be changed for a serviceable unit should a failure occur. Note that modules may
be changed on the advice of Park Air Customer Support (see following contact details).

Email address: [e-mail].
Telephone during normal hours: From UK 01778 381557 or from outside UK 44 1778 381557.
Telephone out of normal hours: From UK 07733 124457 or from outside UK 44 7733 124457.

Caution ...

When replacing a Processor module ensure the correct module is fitted.

❑ For radios at Mod Strike Level 5 the Processor Module part number is 68-60000671/F

(board issue 5).

❑ For radios at Mod Strike Level 7 the Processor Module part number is 68-60000671/H

(board issue 7).

❑ Note that Mod strike 6 was a special to type modification.

The following provides information that enables the user to:

❑ Conduct scheduled maintenance tasks including checking/setting the reference frequency

oscillator to compensate for long term ageing effects

❑ Identify any tools or test equipment required to maintain the transceiver
❑ Use the built-in test facilities to check transceiver functionality
❑ Remove a transceiver from service to dismantle and replace a faulty module, and where

applicable, realign the module

❑ Install the Virtual Front Panel (VFP) software into a PC
❑ Use the VFP to:

❑ Download all radio settings to a file that can be stored/printed for reference
❑ Change radio settings
❑ Copy settings from one radio to another
❑ Check a radio after repair and return it to service.

Refer to the Installati on and Operating sections, available fr om the Main page of this document, for
complete installation and setting up procedures.

Included on the CD-ROM delivered with the radio is the VFP software. The software enables the original
settings to be re-loaded and alignment to be made if the transceiver's Processor, PA Control and
PA modules are ever repla ced. The VFP so ftware can be run from this doc ument by clic king on ‘B ack
to Transceiver Mai n Page’ ( at top r ight of page) and f rom the re, c licking on ‘Bac k to Mai n Page ’ (at t op
right of page). When the Main page is displayed select ‘Run the VFP Software’.

Note ...

A hard copy of the User Documentation is available. Contact Park Air for details.

Page 2

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Transceiver Variants

Two variants of the T6TR VHF transceiver are available:

❑ B6550/NB/50. This trans ceiver frequency operating range is 118.000 to 136.975 MHz. Power

output adjustable from 5 to 50 Watts. Frequency stability compliant with ICAO requirements for 2,
3 and 4-offset carrier applica tio ns

❑ B6550/WB/50. This tr ansceiver frequency operating range is 112.000 to 155.975 MHz . Power

output adjustable from 5 to 50 Watts. Frequency stability compliant with ICAO requirements for 2,
3 and 4-offset carrier applica tio ns.

Operating Frequency

The transceiver’ s op er ati ng frequ enc y c an be changed by the user throug h the fr ont pa nel , t hr oug h t he
VFP, through a T6 controller or through an associated MARC system (or compatible control data
system). Details of how to ch ange the operating frequen cy from th e front panel and VF P are conta ined
in this document. Details of how to change the frequency from MARC or a T6 controller can be found in
the MARC and T6 Controller User Guides respectively.

Input Supplies

The transceiver can be operated from standard ac input supplies, or from a low voltage dc supply. Both
ac and dc input supplies can be connected to the equipment. When both ac and dc supplies are
connected, operation from the ac supply takes priority; automatic change-over to the dc supply will occur
if the ac supply fails. On restoration of the ac supply, the equipment reverts to ac operation.

Built-in Test (BIT) Indications

The transceiver continuously self monitors key internal parameters without affecting normal operation. If
a BIT alarm is detected, the front panel Alarm indicator lights, the Ready indicator becomes unlit, and the
transceiver becomes inoperable. Additionally, a BIT alert, as opposed to a BIT alarm may be indicated.

A BIT alert is shown b y the front p anel Al arm indi cator flash ing; the Ready i ndica tor remai ns lit and the
transceiver remains operational, but at reduced power. Conditions that cause a BIT alert are:

❑ RF output has reduced from its setting by more than 3 dB
❑ Supply volts has fallen below a pre-defined level.

In AM-voice and AM-MSK modes only, and in addition to continuous monitoring, an interruptive BIT test
can be initiated locally at the front panel or remotely. When initiated, test signals are injected that key the
transceiver allowing parameters to be monitored in their active state.

The results of continuous monitoring, and of interruptive testing, are available at the front panel LCD and,
if connected, the VFP PC. When the transceiver is used with a MARC system (or other compatible data
and control system) the results are also sent, in the form of a data message, to the monitoring facility.

Page 3

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Configurations

The connectors used to configure the transceiver depend on the required operating mode. The purpose
of each connector is detailed in the following text. Config uration detai ls can be f ound in the In stallation
section of this document.

Antenna Connector Used in all operating modes to connect the 50 ohm antenna

feeder cable.

Headset/Microphone/Diagnostics This is a dual purpose connector. A microphone/headset

Connector(complete with integral PTT switch) can be connected
to enable

local AM-voice operation. Alternatively, a PC can be connected to

allow use of the VFP. The VFP can be used to set the
transceiver's operational settings, or to download new software.

Reference Connector Used in all operating modes to check and reset the transceiver's

reference frequency.

Facilities Connector Used primarily to connect remote signals when using AM-voice

mode and the transceiver does not form part of a MARC system.
Some auxiliary signals available at this connector, for example
the 24 volt (nominal) unregulated output supply, can be utilized
irrespective of the operating mode.

MARC Port The MARC port is used to connect received audio, squelch

indication and data to a MARC system via an RSE2.

MARC Audio The MARC Audio port is used for connecting transmit audio and

PTT to a MARC system via an RSE2.

MARC Data The MARC Data port is used for connecting data to a MARC

system.

T1/E1 The T1/E1 port is an 8-way RJ48 socket used for connecting a

Mode 3 network computer.

HLDC The HLDC port is an 8-way RJ48 socket used for connecting a

Mode 2 network computer.

Page 4

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Maintenance Procedures

WARNING Dangerous Voltages

The instructions given in this section involve connecting dangerous voltages to the
transceiver. The instructions detailed in this document must be carried out only by suitably
qualified personnel.

When an ac supply is connected, lethal voltages are present within the transceiver. Care
must be taken by personnel to avoid accidental contact with exposed circuitry during
maintenance or alignment procedures.

When the power switch is set to the off position, lethal voltages are still present in the
transceiver's internal power supply circuitry. To ensure safe working, the ac and dc input
supplies must be disconnected from the transceiver.

WARNING

The antenna used with the transceiver must be installed such that the resultant radiated field
strength is below 10 W/m² in areas normally accessible to personnel.

Caution

The T6TR transceiver’s circuitry contains Electrostatic Sensitive Devices (ESSDs).
Personnel must be aware of the precautions necessary to prevent damage to such devices.

Caution Unauthorized Modifications

Changes or modifications made to this equipment that are not expressly approved by
Park Air, or parties authorized by Park Air, could void the user ’s authority to operate the
equipment.

Caution Repairs

Antenna Radiation

ESSDs

(1) When carrying out repairs to the PA module, care must be taken not to damage the gasket.

If the strips become damaged, they must be replaced. Failure to comply with this
instruction may compromise the transceive r’s Electromag netic Compatibil ity (EMC) and
breach European Commission regulations.

(2) When screws are inserted into the transceiver PA casting care must be taken not to

exceed a torque of 6 Ibs/in ch when tightening . This applies when r eplacing the top and
bottom covers and during the refitting of the PA module.

Page 5

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Introduction

This part of th e Maintenance section covers maintenance tasks that include schedule maintenance,
dismantling and assembly instructions and fault finding. Due to the complexity of most modules the
recommended policy is repair by replacement of the radio. However module replacement information is
supplied in the event that Park Air Customer Support advises this may be done.

A faulty module may be traced by aid of the front panel LCD and Scroll/Select control; VFP or MARC.
Note ...

Access to a PC is essential when fitting spares.
During all maintenance tasks the warnings and cautions given in this section should strictly be adhered to.
For maintenance purposes and loading new software, a Virtual Front Panel (VFP) is used. The VFP is a

standard PC loaded with a bespoke software package for carrying out these tasks. Separate VFP
operational instructions are included in Part 3 of this section of the document.

Tools, Materials and Test Equipment Required

The following tools, materials and test equipment should be made available to complete the maintenance
tasks described in this section:

❑ Personal Computer (PC)
❑ General Pu rpose Toolkit (including a

1.5 mm Allen key)

❑ 6BA Nut Spinner
❑ Camel Hair Brush
❑ Clean Lint-free Cloths

❑ Frequency Counter
❑ Power Meter
❑ Dummy Load
❑ PC to Radio Interconnection Lead

(Park Air part number 17E12600001)

Scheduled Maintenance

Park Air recommends that this is carried out at twelve-monthly intervals. Schedule maintenance
comprises:

(1) Ensuring the equipment is clean (see page 7).
(2) Ensuring that the external connectors are securely fitted to the transceiver (see page 7).
(3) Checking and resetting (if required) the transceiver's frequency standard (see page 7).
(4) Performing a BIT interruptive test (see page 7).
(5) Performing an ac and dc change-over check (see page 9).

Page 6

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Schedule Maintenance Procedure

The procedure, detailed in the following paragraphs, should be followed whe n carrying out schedule
maintenance.

Cleaning the Equipment

Remove all dust a nd di rt from the e quipm ent's e xterior using the clean ing c loths a nd ca mel h air brush.
Clean the front panel indicators and LCD face.

Security of External Connections

Check all external connections are secure and free from damage.

Setting the Transceiver’s Internal Reference Frequency

To set the transceiver’s inte rn al refer ence fr equ enc y, use the fol lo win g pr ocedure. Note that references
to the switch in the procedure mean the Scroll/Select switch.

(1) Refer to AM-Voice Mode Settings

Screen in the Operation s ection of this
document and set the offset to 0 kHz.

(2) Select Exit and return to the Main

screen.

(3) Connect a high impedance frequency

counter to the front panel Reference
connector.

(4) From the M ain scre en, pre ss the swi tch

to display the Contro l screen. Turn the
switch until Settings is highlighted.
Press the switch.

(5) Ensure the Settings screen is displayed.

Turn the switch until Ref Freq is
highlighted, th en pre ss t he switch .

(6) With Ref Freq selected turn the switch

clockwise or anti-clockwise until the
frequency counter reads 20.950000 MHz
±10 Hz, then press the switch.

(7) Turn the switch clockwise until Exit is

highlighted, then press the s witch. You
are returned to the Main screen.

AM-Voice Mode Settings Screen

A N T C / O D e l
O f f s e t 0 . 0 k H z
S q u e l c h - 1 0 7 d B m
E x i t < < > >

Control Screen

F r e q u e n c y
C h a n n e l
S e t t i n g s
E x i t

Settings Screen

B a n d E d g e s
R e f F r e q 5 0 . 0 %
B a c k l i g h t 0 3 0 s
E x i t < < > >

(8) Disconnect the frequency counter.
(9) Refer to AM-Voice Mode S ettings Screen in the Operation se ction of this doc ument and set to

the required offset.

To Initiate a BIT Test

Use the following procedur e to initiate an interrup tive BIT test from the transceiver's fro nt panel. A BIT
test cannot be initiat ed while the transceiver is keyed. An interru ptive BIT test cannot be initiated in
Mode 2 or Mode 3.

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During an interruptive BIT test, the transceiver radiates modulated carrier waves at the set
power. Users should therefore obtain the necessary authority before initiating a test.

If the test is to be carr ied out with the ant enna disconn ected, ensure a lo ad is fitted to the
transceiver's Antenna (not Rx Antenna) connector.

In order to test the line input stages, an internally generated 1 kHz tone is injected into the
line input circuit. Any other audio present on the line input will cause the test to be
inaccurate. Therefore the transceiver must not be keyed during the test.

(1) From the Main screen, press the switch to

display the Control screen. Turn the switch
until BIT is highlighted. Press the switch.

(2) Ensure the BIT menu is displayed. Turn the

switch until BIT Initiate is highli ghted. Press
the switch.

B I T
S / W C o n f i g
S t a n d b y
E x i t < <

B I T I n i t i a t e
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
E x i t > >

(3) During the test, which takes approximately

two seconds, the Testing screen is
displayed.

T e s t i n g

P l e a s e W a i t

On completion, and if the interruptive test was initiated from the front panel, one of the following screens
will be shown.

(4) Selecting OK takes the user back to the BIT

screen.

.

(5) Selecting OK takes the user back to the BIT

screen. The user can then scroll through the
screen to check out transceiver parameters
for failure.

T e s t S t a t u s

P A S S

O K

T e s t S t a t u s

F A I L

O K

Page 8

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AC and DC Change-over Check

If both ac and dc input supplies are connected to the transceiver, carry out the following check:

(1) Confirm that both ac and dc supplies are connected to the transceiver. Ensure that the rear panel

Power switch is set to the I (on) position.

(2) Confirm that the front pa nel Rea dy ind icato r is li t, the LCD i s illum inated , and the transc eiver i s

operational.
(3) Switch off the ac supply from its source.
(4) Check that the tra nsceiver continues to operate correctly from the dc supply. If accessed, the

front panel BIT scree n will show AC Supply as of f and DC supply as on. The value of the dc

supply is also shown.

Page 9

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Dismantling and Assembly Instructions

Introduction

This topic provides the user wi th de tailed instru ction s on the rem oval and r eplacem ent of mo dules a nd
assemblies. Access to a PC loaded with VFP software, and a radio to PC se rial interconnection lea d,
Park Air part number 17E12600001 is essential when carrying out these instructions.

The transceiver’s m odules and assem blies are acce ssed by removi ng the top and bottom co vers. The
top cover is secur ed by 18 countersunk screws a nd the bottom cover by 15 co untersunk screws. To
remove a module fr om th e tran sceiv er, fo llow th e instr uctio ns de tailed in the fo llowi ng par agraphs (see

Fig 3 for module locations when covers are removed).

Cautions ...

(1) When removing or refitting modules, observe antistatic handling precautions.
(2) Do not change any potentiometer (or link) settings unless detailed in these instructions.

Potentiometers have been set using specialist equipment.
(3) The transceiver uses the following Molex KK connectors:

CN2 on the PA Control/Rx RF module

CN7 and CN6 on the PSU Regulator module

CN3 on the Front Panel PCB.

To remove KK type connectors:

❑ Free the locking mechani sm on the c onn ect or by mo ving one side of the connector up, then

move the other side up (see the following diagram). The upward motion should only be as far
as needed to free the locking mechanism.

❑ DO NOT pull the cable to free the connector.

❑ Note that KK type connecto rs are des ig ned to be rem ov ed in this man ner to fre e the l ocki ng

mechanism. Do not use this procedure with non-KK type connectors as damage to the
connector may occur.

Lift 2Lift 1

PCB

Top Cover

To remove the to p cov er, loca te and unsc rew t he 18 count ersu nk scr ews secu ring the to p cover to t he
mainframe. Access can then be gained to the following modules:

❑ Processor module
❑ PSU Regulation module
❑ Power Supply (requires both top and bottom covers to be removed)
❑ Front Panel assembly (requires both top and bottom covers to be removed).

WARNING Dangerous Voltages

Dangerous voltages are pr esent w ithin the t ranscei ver. Care must be tak en by p ersonne l to
avoid accidental contact with exposed circuitry when the top cover is removed and power is
applied to the radio.

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Removing and Refitting the Processor Module

The Processor module is located as shown in Fig 3. A module removal diagram is shown in Fig 4.

Removal

Before attempting to remov e the Processor module, and if possi ble, save the equipment settings. T o
achieve this connect a PC, with the VFP software loaded, to the radio using the PC to Radio
Interconnection Lea d (Park Air part numb er 17E12600001). With the VFP software activ e, upload the
radio settings to a specified file.

Ensure that the transceiver is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Remove the transceiver’s top cover as described on page 10 (take heed of the warning).
(2) Locate the Processor module and disconnect the following connectors:

❑ CN1 50-way connector (50-way ribbon cable from PA Control/Rx RF module)

❑ CN3 14-way connector (14-way ribbon cable from PSU Regulator module)

❑ CN4 34-way connector (34-way ribbon cable from Front Panel module)

❑ CN2 SMB connector (to PA Control/Rx RF module).

(3) Gain access to the rear of the transceiver. Using a 6BA nut spinner tool, remove the four

screwloc 8 mm-4-40 UNC screws that secure t he Proces sor module interfac e connectors CN5

and CN6 to the rear panel.
(4) Remove the 11 (Mod Strike 5 modules), 7 (Mod Strike 6 and 7 modules) M3 x 8 mm screws that

secure the module to the transceiver’s mainframe.
(5) Remove the module from the chassis.

Refitting

To refit the Processor module, proceed as follows:

(1) Place the module in positi on. E nsu re no wir es are tra ppe d by the mod ule . Ens ure jumper J2 on

the module is set to ‘R/TR’ for transceiver (see diagram on this page).

JP2

Shown set for

Transceiver

T2

T3

TS7

C84

T

R/TR

T

R/TR

IC38

IC20IC19

IC21

IC25

IC27

(1) Ensure the module’s int erface connecto rs CN5 and CN6 are located co rrectly and are ali gned

with the screw holes in the rear panel. Fit the four screwloc 8 mm-4-40 UNC screws and wav y

washers but leave them loose.

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(2) Fit the 11 (Mod Strike 5 modules), 7 (Mod Strike 6 and 7 modules) M3 x 8 mm screws that secure

the module to the transceiver’s mainframe, but leave them loose.
(3) Using a nut spinner tool, tighten the four screwloc 8 mm-4-40 UNC screw s and wavy washers

that secure the connectors; then ti ghten the 11 (Mod Strik e 5 modules), 7 (Mod Strike 6 and 7

modules) M3 x 8 mm screws that secure the module to the receiver’s mainframe.
(4) Refit the following connectors to the module:

❑ CN1 50-way connector (50-way ribbon cable from PA Control/Rx RF module)

❑ CN3 14-way connector (14-way ribbon cable from PSU Regulator module)

❑ CN4 34-way connector (34-way ribbon cable from Front Panel module).

(5) Re-establish the ac and/or dc supplies (take heed of the warning on page 10).
(6) Switch power on at the radio using the rear mounted Power switch.
(7) Ensure the front panel Ready indicator is lit and the Alarm Indicator is unlit.
(8) If a new module has been fitted, connect the VFP PC to the radio using the PC to Radio

Interconnection Lead, Par k Air p art number 17E12 600001 (if not alrea dy con nected ). Note that

any module sent from Park Air as a spare for a particular radio will be programmed with

compatible operat ing and F ill softwar e. Park Air k eeps recor ds of modu le softwar e in all rad ios

supplied. Care must be taken when using a module removed from another radio as this module

may not have compatible software.
(9) If saved during the removal procedure, download the radio settings from file using the VFP (see

VFP information starting on page 21). Alternatively the settings can be edited by hand as

described in the Operation section of this document. Once entered, ensure the required settings

appear in the VFP screen.
(10) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure

To Calibrate the Transceiver on page 26.

(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.
(12) Remove the VFP PC to radio interconnection lead and switch power off at the transceiver using

the rear mounted Power switch. Isolate the transceiver from the ac and/or dc supplies.
(13) Refit the transc eiver’s top cover ( take note of repairs caution (1 ) on page 5 before carrying out

this task). The transceiver can now be returned to service.

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Removing and Refitting the PSU Regulator Module

The PSU Regulator module is located as shown in Fig 3. A module removal diagram is shown in Fig 5.

Removal

Before attempting to remove the PSU Regulator module, ensure that the transceiver is isolated from the
ac and dc input supplies. Then proceed as follows:

(1) Remove the transceiver’s top cover as described on page 10 (take heed of the warning).
(2) Locate the PSU Regulator module and remove the three M3 x 8 mm captive washer screws that

secure the module to the transceiver’s mainframe.
(3) Carefully raise the module to gain access to the module connectors.
(4) Disconnect the following connectors:

❑ CN5 10-way connector (10-way ribbon cable to PA Control/Rx RF module)

❑ CN6 6-way connector (2-way loom to power supply). Note caution (3) on page 10

❑ CN4 14-way connector (14-way ribbon cable to Processor module)

❑ CN3 3-way connector (3-wire loom to PA module)

❑ CN7 3-way connector (3-wire loom to rear panel On/Off switch). Note caution (3) on page 10

❑ CN2 2-way connector (2-wire loom from dc input connector on rear panel)

❑ CN1 4-way connector (4-wire cable from power supply)

❑ CN9 2-way connector (2-wire cable ac input to power supply)

❑ CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection).

(5) Remove the module from the chassis.

Refitting

To refit the PSU Regulator module, proceed as follows:

(1) While holding the module in position, connect the following connectors:

❑ CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection)

❑ CN9 2-way connector (2-wire cable ac input to power supply)

❑ CN1 4-way connector (4-wire cable from power supply)

❑ CN2 2-way connector (2-wire loom from dc input connector on rear panel)

❑ CN7 3-way connector (3-wire loom to rear panel On/Off switch)

❑ CN3 3-way connector (3-wire loom to PA module)

❑ CN4 14-way connector (14-way ribbon cable to Processor module)

❑ CN6 6-way connector (2-way loom to power supply)

❑ CN5 10-way connector (10-way ribbon cable to PA Control/Rx RF module).

(2) Locate the module in position. Ensure no wires are trapped by the module.
(3) Secure the module t o the transceive r’s mainframe using the three M3 x 8 mm capti ve washer

screws removed during the removal procedure.
(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 10).
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(7) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.

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(8) Switch power off at the transceiver using the rear mounted Power switch. Isolate the transceiver

from the ac and/or dc supplies.
(9) Refit the transceive r’s top c over (take n ote of rep airs cauti on (1) on page 5 before carrying out

this task). The transceiver can now be returned to service.

Bottom Cover

To remove the bottom cover, locate and unscrew the 15 captive screws securing the bottom cover to the
mainframe. Access can then be gained to the following modules:

❑ PA Control/Rx RF module
❑ Power supply (requires top and bottom covers to be removed)
❑ PA module (requires top cover and bottom covers to be removed)
❑ Front Panel assembly (requires top cover and bottom covers to be removed).

WARNING Dangerous Voltages

Dangerous voltages are pr esent w ithin the t ranscei ver. Care must be tak en by p ersonne l to
avoid accidental contact with exposed circuitry when the bottom cover is removed and
power is applied to the radio.

Removing and Refitting the PA Control/Rx RF Module

The PA Control/Rx RF module is located as shown in Fig 3. A module removal diagram is shown in Fig 6.

Removal

Before attempting to remo ve th e PA Control /Rx RF mo dule, en sure that the transceiver is isol ate d from
the ac and dc input supplies.

Then proceed as follows:

(1) Remove the transceiver’s bottom cover as described above (take heed of the warning).
(2) Locate the module and disco nnect the following conne ctors (before removin g CN7 and CN12,

note the antenna configuration):

❑ CN1 50-way connector (50-way ribbon cable from Processor module)

❑ CN6 10-way connector (10-way ribbon cable from PSU Regulator module)

❑ CN5 SMB connector (reference frequency)

❑ CN3 SMB connector (RF drive)

❑ CN4 SMB connector (forward power sense)

❑ CN2 6-way connector (to PA module). Note caution (3) on page 10)

❑ CN8 SMB connector (to Processor Module)

❑ CN7 SMB connector from the Rx antenna connection or CN13 on the PA module (see

antenna configuration on page 16)

❑ CN12 SMB connector (connects to CN13 on the PA module) or Rx antenna connection (see

configuration on page 16).

(3) Remove the seven M3 x 8 mm captive washer screws that secure the module to the transceiver’s

mainframe.
(4) Remove the module from the chassis.

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Refitting

To refit the PA Control/Rx RF module, proceed as follows:

(1) Place the module in position. Ensure no wires are trapped by the module.
(2) Fit the seven M3 x 8 captive washer screws that secure the module to the transceiver’s

mainframe.
(3) Refit the following connectors to the module:

❑ CN7 SMB connector to the Rx antenn a connection or to the connecto r from CN13 on the

PA module (see antenna configuration on page 16)

❑ CN12 SMB connector to the CN13 on the PA module or Rx antenna connection (see

configuration on page 16)

❑ CN8 SMB connector (to Processor Module)

❑ CN2 6-way connector (to PA module)

❑ CN4 SMB connector (forward power sense)

❑ CN3 SMB connector (RF drive)

❑ CN5 SMB connector (reference frequency)

❑ CN6 10-way connector (10-way ribbon cable from PSU Regulator module)

❑ CN1 50-way connector (50-way ribbon cable from Processor module).

(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 14).
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(7) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure

To Calibrate the Transceiver on page 26

(8) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.
(9) Remove the VFP PC to radio interconnection lead and switch power off at the transceiver using

the rear mounted Power switch. Isolate the transceiver from the ac and/or dc supplies.
(10) Refit the transceiver’s bottom cover. The transceiver can now be returned to service.

Page 15

Antenna Configuration

CN12
PARK

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RX Antenna
Connector

CN7

Antenna

Configuration

Single Rx antenna CN13 (from PA Module)
Dual CN13 (from PA Module) Rx antenna

Connector CN12

PARK

Connector CN7

Antenna Configuration

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Removing and Refitting the Power Supply

The Power Supply is located as shown in Fig 3. A module removal diagram is shown in Fig 7.

Removal

Before attempting to remov e the Power Supp ly, ensure tha t the transceiver is isolated fr om the ac and
dc input supplies. Then proceed as follows:

(1) Remove the transceive r’s top and bottom covers as descri bed on page 10 and page 14 (take

heed of the warnings on those pages).
(2) Support the radio on its side.
(3) Locate the power supply . From the bottom half of the uni t remove the four No. 6 x 32 UNC

countersunk sc rews that secure the power supply to the transceive r’s mainframe. During this

operation support the power supply from the top half of the unit.
(4) Withdraw the power supply from the chassis sufficient to allow access to the power terminal

blocks taking care not to damage the ac terminal plastic supply guard.
(5) Remove the connector CN4 (power supply to the power regulator).
(6) Disconnect the dc wires from the eight connector terminal block.
(7) Slide back the terminal block cover and disconnect the ac wires from the three connector terminal

block (marked L N E).
(8) Carefully remove the power supply from the transceiver.

Refitting

(1) With the transceiver on its side hold the power supply near to its securing position in the top half

of the radio.
(2) Slide back the terminal block cover and connect the ac wires to the three connector te rminal

block (marked L N E); brown to terminal L, blue to terminal N and yellow/green to terminal E.
(3) Connect the dc wires to the eight connector terminal block; red to terminal 2 and terminal 3 and

black to terminal 6 and terminal 7.
(4) Connect connector CN4.
(5) Taking care not to damage the plastic supp ly guard, low er the Power Supply into position a nd

secure from the bottom half of the unit using the four countersunk screws.
(6) Re-establish the ac and/or dc dc supplies (take heed of the warnings on page 10 and page 14).
(7) Switch power on at the radio using the rear mounted Power switch.
(8) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(9) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.
(10) Switch power off at the transceiver using the rear mounted Power switch. Isolate the transceiver

from the ac and/or dc supplies.
(11) Refit the transceiver’s top and bottom covers (take note of Repairs caution (1) on page 5 before

carrying out this task). The transceiver can now be returned to service.

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Removing and Refitting the PA Module

The PA module is located as shown in Fig 3. A module removal diagram is shown in Fig 8.

Removal

Before attempting to r emov e the P A mod ule, en sure tha t th e transc eive r is is olate d from the ac an d dc
input supplies. Then proceed as follows:

(1) Remove the transceive r’s top and bottom covers as descri bed on page 10 and page 14 (take

heed of the warnings on those pages).
(2) Remove CN3 from the PSU Regulator module.
(3) With the transceiver upside-down disconnect CN2 from the PA Control/Rx RF module.
(4) Disconnect the SMB c onnector s CN8 an d CN10. Not e that CN10 is lo cated w ithin th e heats ink

fins and should be disconnected using long nosed pliers. Do not attempt to remove the connector

by pulling on the cable.
(5) Remove the black equipment handle from the PA side of the radio by unscrewing and removing

the two M5 x 16 mm panhead screws that secures it to the transceiver.
(6) Remove the six M3 x 8 mm countersunk screws and two M3 x 8 mm captive screws that secure

the PA from the bottom and top of the mai nframe as shown in Fig 8. Ensure the PA module i s

well supported during this operation.
(7) Withdraw the PA module from the mainframe taking care not to snag the wiring looms.

Refitting

Note ...

Take note of Repairs caution (2) on page 5 before fitting the PA module.

To refit the PA module, proceed as follows:

(1) Place the module in position and butt it up to the mainframe. Ensure no wires are trapped by the

module.
(2) Fit the six M3 x 8 countersunk screws and two M3 x 8 mm captive screws that secure the module

to the transceiver’s mainframe.
(3) Fit the black equipment hand le to the PA side of the radi o using the two M5 x 16 mm panhead

screws.
(4) Connect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink fins

and should be connected using long nosed pliers if unable to use fingers in the enclosed space.
(5) With the transceiver upside-down connect CN2 to the PA Control/Rx RF module.
(6) Fit CN3 to the PSU Regulator module.
(7) Re-establish the ac and/or dc supplies (take heed of the warnings on page 10 and page 14).
(8) Switch power on at the radio using the rear mounted Power switch.
(9) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure

To Calibrate the Transceiver on page 26.

(11) Carry out a BIT interruptive test as detailed in the procedure ‘To Initiate a BIT Test on page 7’.
(12) Remove the VFP PC to radio interconnection lead and switch power off at the transceiver using

the rear mounted Power switch. Isolate the transceiver from the ac and/or dc supplies.
(13) Refit the transceiver’s top and bottom covers (take note of Repairs caution (1) on page 5 before

carrying out this task). The transceiver can now be returned to service.

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Removing and Refitting the Front Panel Assembly PCB

The Front Panel assembly PCB is located as shown in Fig 3. An assembly and PCB removal diagram is
shown in Fig 9.

Removal

Before attempting to remove the Front Panel assembly PCB, ensure that the transceiver is isolated from
the ac and dc input supplies. Then proceed as follows:

(1) Remove the transceive r’s top and bottom covers as descri bed on page 10 and page 14 (take

heed of the warnings on those pages).
(2) Disconnect CN4 at the Pr ocessor module. Careful ly pull the cable throug h the aperture in the

mainframe to free it.
(3) Disconnect SMB connector CN5 at the PA Control/RxRF module.
(4) Remove the four M3 x 8 mm countersunk screws from the bottom and top of the mainframe box

section (see Fig 9, Diagram A).
(5) Remove the two black e quipment handles by unscrew ing and removing the four M5 x 16 mm

panhead screws that secure them to the transceiver. The front panel can now be moved forward

and away from the mainframe.
(6) At the front panel, rel ease the control kno b by unscrewing th e Allen head grub screw using a

1.5 mm Allen key. Withdraw the control knob from the spindle.
(7) Disconnect the speaker connector from the Front Panel PCB.
(8) Remove the Front P anel PCB f rom the Fron t Panel as sembly by r emoving th e six M3 x 6 mm

panhead screws and wavy washers (see Fig 9 Diagram B).

Refitting

To refit the Front Panel assembly PCB, proceed as follows:

(1) Place the PCB in positio n at the Front Panel assembly. Ens ure the spindle of the control kn ob

and Heaset/Microphone/Diagnostics connector are correctly located.

(2) Secure the PCB to the Front Panel assembly using the six M3 x 6 mm panhead screws and wavy

washers (see Fig 9, Diagram B).
(3) Connect the speaker connector to the Front Panel PCB.
(4) At the front panel, place the control knob onto the spindle and using a 1.5 mm Allen key, secure

the Allen head grub screw .
(5) Secure the Front Panel assemb ly to the top and bot tom of the mai nfr am e box sec ti on usin g th e

four M3 x 8 mm countersunk screws. Fit the two black equipment handles using the four

M5 x 16 mm panhead screws (see Fig 9, Diagram A).
(6) Route the ribbon cable to the Processor module connector CN4 and connect it.
(7) Route the SMB connector to CN5 on the PA Control/RxRF module and connect it.
(8) Re-establish the ac and/or dc supplies (take heed of the warnings on page 10 and page 14).
(9) Switch power on at the radio using the rear mounted Power switch.
(10) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.
(12) Switch power off at the transceiver using the rear mounted Power switch. Isolate the transceiver

from the ac and/or dc supplies
(13) Refit the transceiver’ s top and bot tom cover s (take note of repairs caut ion (1) on page 5 before

carrying out this task). The transceiver can now be returned to service.

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Removing and Refitting the Cooling Fan

The cooling fan is at the rear of the PA module as shown in Fig 3. An assembly and removal diag ra m is
shown in Fig 10.

Removal

Before attempting to remove the fan, ensure that the transceiver is isolated from the ac and dc input
supplies. Then proceed as follows:

(1) Disconnect the two-pin connector.
(2) Remove fan's finger guard.
(3) Using an Allen key, inserted through the holes in the fan exposed with the finger guard removed,

remove the three M4 x 12 mm caphead Allen screws that secure the fan to the PA module

heatsink.
(4) Remove the fan from the PA module.

Refitting

To refit the cooling fan, proceed as follows:

(1) Locate the fan in positio n and using a s ui tabl e Al le n ke y i ns erted through the holes for the fan 's

finger guard, secure using the four M4 x 12 mm caphead Allen screws.
(2) Sec ure the finger guard to the fan.
(3) Connect the 2-pin fan connector to the fan. Ensure the + marked socket mates with the + marked

plug on the fan.
(4) Re-establish the ac and/or dc supplies.
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(7) Carry out a BIT interruptive test as detailed in the procedure ‘To Initiate a BIT Test on page 7’.

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