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HF-SSB MICOM-500E Model G761AA / G762AA
American Communication Systems
Discover the Power of Comm unications
™
–
VISIT
http://www.ameradio.com
This manual is an appendix to the Micom 2E-Trunk O w ner’s M anual 6802952C 60
HF-SSB
MICOM-500E-A
O w ner’s M anual
6886858J01-A
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HF-SSB Micom –500E-A
CONTENTS
Introduction............................................................................................................................................2
General Specifications...........................................................................................................................2
Block diagram........................................................................................................................................3
Controls and indicators..........................................................................................................................4
General principles of operation..............................................................................................................5
500W HF Linear Amplifier Unit...........................................................................................................6
DC Power Supply ..................................................................................................................................7
Junction Box ..........................................................................................................................................7
Performance Specifications ...................................................................................................................8
500W Transceiver Model Complements.............................................................................................11
Trouble Shooting .................................................................................................................................11
Radio Tuning Procedure......................................................................................................................12
ALE......................................................................................................................................................12
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HF-SSB Micom –500E-A
INTRODUCTION
The transceiver is a complete unit that includes Micom-2ET, 500watts amplifier , power supply,
enclosed together in a 19” drawer. The control head of the radio is placed on the drawer’s front
panel. The unit includes a movable drawer, which allows to detach the control panel of the radio and
moved up to 5 meters away (cable extension included).
The transmitter amplifier is microprocessor controlled, doing the following functions:
- Adjust amplifier input sensitivity
- Monitor heat, VSWR, and under voltage conditions,
- Setting the power output via the channel power setting (Max, High, Medium and Low)
GENERAL SPECIFICATION
Power Output: 1.6-30MHz: 500W PEP and average
Band Switching: Fully Automatic
Input Voltage: 220VAC-10A /110VAC-20A
Cooling: Cooling fans
T/R Switching time: 10mS nominal
Band Switch time: 100mS nominal
Protection: Input over drive under voltage (adjustable):
Factory default 28+/-3 VDC Amplifier module
Current imbalance VSWR faults Frequency out of
Specified range over current over temperature.
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MICOM-500W BLOCK DIAGRAM
HF-SSB Micom –500E-A
110/220 AC
SW
ON/OFF
CONTROL HEAD
RADIO
13.8v
POWER
SUPPLY
RF OUT
28v
J-BOX
RF IN
FAN
NOTE: ALL THE WIRES AND CABLES CAT No - 01MB000027
SENS
AMP
3
RF
TO ANTENNA
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HF-SSB Micom –500E-A
K
Controls and Indicators
Power Amplifier module has the following controls and indicators:
I
Indicator VOLT –shows when power supply voltage is out of limits.
In OVER –input overload indicator. Input power is out of limits.
TEMP –amplifier overheat indicator.
VSWR –load circuit failure indicator.
FAILURE –fatal failure indicator, further amplifier operation is impossible.
TX –transmission mode indicator.
Figure 1. PA 500 front panel
Controls and Indicators
Power Amplifier module has the following controls and indicators:
Indicator VOLT –shows when power supply voltage is out of limits.
In OVER –input overload indicator. Input power is out of limits.
TEMP –amplifier overheat indicator.
VSWR –load circuit failure indicator.
FAILURE –fatal failure indicator, further amplifier operation is impossible.
TX –transmission mode indicator.
BYPASS –bypass mode indicator. The amplifier shall operate in this mode when it is
disconnected to power supply, faulty, can not operate by any other reason or is in receive
mode.
BAND OUT indicator shows that input signal frequency is out of operation band.
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HF-SSB Micom –500E-A
General principles of operation
Block diagram of the power amplifier is shown at Fig.4. Input RF signal with 25W nominal
level comes through “RF In” connector to TS1 227 board of PAMP 500 amplifying device
consisting of 4-channel power splitter and 4-channel amplifier. The power splitter unit contents:
Input signal level sensor;
Input relay Rx/Tx that provides the possibility to operate in BYPASS mode;
Input signal attenuator used by the amplifier protection system;
Signal frequency sensor;
Power splitter.
The signal comes from power splitter output to four 150W amplifying sections inputs.
Then, amplified signal is summed by power Combiner (TS5 226).
The signal then comes from Combiner output to harmonic filter (TS5 223) input and then
to output level sensor, output relay Rx/Tx and to output connector “RF OUT”.
The controller provides the power amplifier control, status monitoring and its protection in
emergency situations. By analyzing the input signal level, the controller provides protection of the
amplifier input against overloading. By measuring the input signal frequency the controller selects
and switches on appropriate harmonic filter. Control system also provides the control of the
amplifier sink temperature. Depending of its level the forced air cooling system shall be switched on
or output power level shall be reduced if necessary and if the temperature limit is exceeded the
amplifier shall be switched to BYPASS mode. By analyzing signals from output sensor the
controller monitors the status of load, and if VSWR in the load is higher than maximum allowed one
the controller decreases output power, and if VSWR is higher than 4 the controller switches the
amplifier to BYPASS mode. Besides, the controller sends to CONTROL output connector the
signals that proportional to forward and reflected power at the amplifier output and that assigned for
output power control from an external device, for example, exciter.
Thus, the amplifier control system provides full its status and operability control. It
switches the amplifier to BYPASS mode in the following cases:
VSWR > 1:4
Input signal frequency is out of operation band
The temperature mode is out of limits
In other cases, as well as in switched off mode when normal operation of the
amplifier is impossible. In that case the possibility of normal operation of external
transceiver is provided.
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HF-SSB Micom –500E-A
MICOM 2E-Trunk
For Micom 2E-Trunk specification see user manual 6802952C60
500W HF Linear Amplifier Unit
Input Voltage: 28 VDC
Power Output: 1.6-30MHZ: 500W PEP and average
The power amplifier is fully protected by microprocessor control. This circuitry dynamically
monitors all amplifier parameters, and provides adjustments and protection against high VSWR,
under voltage, over current and high temperature conditions.
Current- protection against over current condition (exceeding 60 amps) and current imbalance
between amplifier modules (exceeding 20%). When one of these two conditions exists, the amplifier
turns off-line. To reset the transceiver, power down the amplifier and restart the unit.
Volt - protection against under amplifier turns off-line. To reset the transceiver, power down the
amplifier and restart the voltage condition (less than 28+/-3 VDC). When this condition exists, the
unit.
VSWR –when a sampled VSWR exceeded 4:1 and the power reflected back to the amplifier is
higher than acceptable, the amplifier turns off-line. To reset the transceiver, power down the
amplifier and restart the unit.
Temp - protection against over temperature condition
Atten –as input RF power level increases beyond 60-70 watts, the attenuation increases
automatically. The Attenuate remains engaged until the input drops to 30 watts.
ALC Control- provides adjustable ALC feedback voltage.
A positive voltage is present on the Amplifier line for use with the equipped transceiver for ALC
input control.
PTT keying mode and Band input filter selection enabled automatically. Band switching time is
typically 100 msec or less.
This automated capability is ideal for remote or unattended operating site application.
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HF-SSB Micom –500E-A
3. DC Power Supply
Model: EWS1500-15
Nominal Output Voltage: 28V-50A----14V-30A
Input Voltage Range: 85~132 VAC / 170~265 VAC (Auto Selectable), 47~63 Hz
110/220 VAC power supply - if need to convert the power supply from 220VAC to 110VAC,
please detached the 110/220VAC panel at the rear panel of the unit and short the A and B terminals.
The ON/OFF switch on the front panel of the unit, enables to turn the power supply output on and
off.
Note that, when the dc output power supply is on OFF mode, the internal power supply fans still
work.
4. Junction Box
The junction box enables the connection of up to four external devices simultaneously, in addition to
headphone, to the accessory port of the MICOM –2 (e.g. modem, phone patch.)
Potentiometers adjust - Potentiometers are used to adjust the received audio levels (one of each
connector). Each potentiometer is associated with a connector as follows:
ACC. -J1: RX1
ACC. -J2: RX2
ACC. -J3: RX3
ACC. -J4: RX4
The potentiometers are located on the rear panel of the MICOM-500E.
For more details see Service Manual 68P02952C55
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HF-SSB Micom –500E-A
PERFORMANCE SPECIFICATIONS for 500W TRANSCEIVER
GENERAL
Frequency Range XMIT 1.6 –30 MHz
Frequency Range RX 0.1 –30 MHz (0.1 - 1.6 MHz reduced spec)
RF Input Impedance 50 Ohms
Number of Channels 200 SIMPLEX or HALF DUPLEX
Scanning
1
5 groups with up to 100 channels per group, including 1 guard
channel.
Programmable scan rate: 1 - 5 sec. per channel, in 1 sec. steps
Frequency Stability
0.6 PPM @ -10to 60C
Frequency Drift (Aging) 1 PPM/year
Synthesizer Lock Time 10 msec. Max
Frequency Resolution 10 Hz
Operating Temp. Range
Storage Temp. Range
Humidity
-10to +60C
-30to +70C
95% @ 50C
Remote Control Interface RS232C (Optional)
Modes of Operation J3E SSB
R3E PILOT
H3E AME
J2A CW
J2B RTTY, ARQ, FEC, PACKET, MCW
B8C FAX, DATA, FSK
Dimensions
(mm/inch)Height 10.43265/
(mm/inch)Width 16.61422/
Depth (mm/inch) 508/20
CURRENT CONSUMPTION @ 14 VDC / 28VDC ( INTERNAL CURRENT )
XMIT Voice(500WP.E.P.) 38 Amp
Receive Full Audio 2 Amp
Squelch 1.7 Amp
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ALE specification see user manual 6802952C60
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HF-SSB Micom –500E-A
TRANSMITTER
Output Power 500W P.E.P. and average +/-1dB
Reduced Power Levels 500W, 400W, 300W, 200W (RSS programmable)
Audio Bandwidth
2
350 to 2700 Hz at –6dB
Audio Bandwidth Ripple 3 dB
Intermodulation -31 dB / 500W P.E.P
Spurious Emissions -60 dB / 500W P.E.P
Carrier Suppression -50dB / 500W P.E.P
Undesired Sideband
-55dB / 500W P.E.P
Suppression
Audio Distortion 2.5%
1/2 Power Mic. Sensitivity 15 to 125mV (RMS)/600 Ohms
Hum & Ripple -50 dB
Inband Noise -60 dB (30 Hz BW)
TX/RX Switching Time 10 msec
Tx Tuning Adjustments
3
None
RECEIVER
Sensitivity (SINAD) SSB
0.5 V for 10 dB SINAD (0.35 V Typical. Note 1)
0.1 - 1.6 MHz with reduced performance
1/2 Rated Power Sensitivity
Selectivity
2
1 V for 2.5W audio at speaker
- 6 dB @ 350 to 2700 Hz
–60 dB @ -1 kHz; +4 kHz
Image Rejection -80 dB
IF Rejection -85 dB
RECEIVER (continued)
2
See Micom 2E spec. for more Bands widths.
3
For tune procedure wait about 2 sec when stepping from one channel to another before transmitting.
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Undesired Sideband Rejection -55 dB @ -1 kHz
Spurious -80 dB
Intermodulation -80 dB
Crossmodulation -100 dB @ 100 kHz
Desensitization -100 dB @ 100 kHz
Reciprocal Mixing -100 dB @ 100 kHz
Audio Power at Speaker 5W @ 2.5% distortion
HF-SSB Micom –500E-A
RGC Range
RGC Time Constants
Voice
Data
5 V to 1V (2 dB change in output level)
Attack time 10 msec
Release time 1500 msec
Attack time 10 msec
Release time 10 msec
Squelch Constant SINAD (digital)
Clarifier Range
200 Hz
Receiver Tuning Adjustments None
Maximum Antenna Input 20 kV transient, 100V RMS for 2 minutes
CONTROLS
Standard and optional: volume, on/off, scroll, squelch, scan, USB/LSB, call, monitor, priority, func
and accessory/programming connector.
Specifications subject to change without notice.
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500W TRANSCEIVER MODEL COMPLEMENTS
2ET
M81AMN0KV5AK * MICOM-
FDN6144A Amplifier 500 watts
FPN5585A Power supply
FRN5865A Junction box
01MB000027 Cables
01MB000029 Chassis
01MB000030 Miscellaneous
FMN1615A Microphone
* NOTE:
LORD No-FLN3179A
HIGH POWER No-FLN3180A with interface modification for 500w amplifier
HF-SSB Micom –500E-A
TROUBLE SHOOTING
In case of malfunctioning, perform the following steps (referto the Maintenance
sectionin MICOM-2E Owner’s manual, Motorola publication number 6802952C60).
1. Turn OFF and ON the radio switch to reset both the radio and the amplifier.
2. Use BITE when the channel is in SSB mode only
3. Refer to the User Troubleshooting Chart.
4. Follow the troubleshooting procedures in this section, which provide instructions
for isolating faulty boards.
Troubleshooting a board at component level should be performed according to the
notes on the relevant schematic diagram.
FAULT ADVICE
Ensure power supply maintains voltage greater than 11.0VDC
VOLT trip off-line
VSWR trip off-line Check integrity of antenna and feedline connections.
Amp TEMP led is on. Reduce drive level or duty-cycle. Ensure fan unit is
No PTT Keying Ensure transceiver, amplifier and DC supply all utilized a
under load. Check DC cable connections.
Check for evidence of arc-over or dielectric breakdown
of feedline. Ensure antenna is resonant (<2:1 SWR) at
the desired operating frequency.
operating properly.
common ground.
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HF-SSB Micom –500E-A
RADIO TUNING PROCEDURE
Before operating the 500W transceiver, a calibration procedure should been taken.
An IBM PC and RSS (Radio Service Software) package, FLN2514, are required
to align the radio.(factory setting)
1. On the accessories section, please mark the check box of the “1 kw Amplifier”.
2. There are 4 steps of power outputs as noted above. If you need to perform a
power calibration, please refer to the power calibration procedure in the
MICOM-2E RSS manual.
ALE
Automatic Link Establishment (ALE) is an embedded feature inside the Micom-2E/R
ALE family of mobile/fixed station HF-SSB radios.
Through the combined use of channel scanning, selective calling and Link Quality
Analysis, ALE automatically selects the best available communications link. It is no
longer necessary for an operator to be familiar with the varying factors, which affect high
frequency (HF) propagation between two points.
Each ALE equipped Micom-2 ALE family radio stores a matrix of Link Quality Analysis
(LQA) scores for all other stations in the HF network. Memorized LQA scores are
derived from an analysis of channel "soundings" which are periodically transmitted by
each network station. When an operator selects the individual or net call address of the
receiving station, ALE automatically determines the optimum available channel and
automatically initiates calling procedures. Sending and receiving operators are alerted
when a communication link has been established.
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