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.
Page 3
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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.
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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.
Page 6
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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%.
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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.
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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.
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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.
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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.
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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)
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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.
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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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