Honeywell
COMPONENT MAINTENANCE MANUAL
PART NUMBER 964-0452
I.B.1516A
Mar 30/01
23-12-01
(a) Amplifier Board, A31
The Amplifier Board amplifies the RF input from Receiver/Exciter, A1, with a level
of –7dBm ± 3dB Peak Envelope Power (PEP) or Continuous Wave (CW) to a max-
imum output power of 125W continuous wave (+51dBm) or 400W +0.5dB PEP
(56dBm +0.5dB). It is composed of 4 amplifier stages, the final stage operates in
push-pull mode. A voltage-controlled attenuator is inserted between the 1st ampli-
fier stage and the 2nd amplifier stage with the function of regulating the output pow-
er of Amplifier Board, A31, at a constant level, depending upon the ALC voltage
generated by Amplifier Control, A33.
Amplifier board, A31, also contains a number of monitoring and measuring circuits.
(b) Cooling
The preamplifier and final stage transistors are cooled by a heat sink. An internal
blower ensures the airflow through the Transceiver, and maintains proper cooling
of Power Amplifier, A3, during transmit operations.
(c) Harmonic Filter, A32
Harmonic Filter, A32, contains 1 transmit/receive relay, 7 low-pass filters, 1 or 2 of
which are switched on in order to suppress the harmonics in the RF signal path, de-
pending upon the transmission frequency, as well as a directional coupler for mea-
suring the forward and reflected power.
(d) Modem
The Harmonic Filter, A32, also contains a modem with frequency-division multiplex-
ing, permitting simultaneous bidirectional data transfer between transceiver and an-
tenna coupler vial the coaxial line.
(e) Amplifier Control, A33
Amplifier Control, A33, provides the interface between Controller, A8, and Amplifier
Board, A31, and Harmonic Filter, A32. This connection links the information coming
via the module data bus with internal module signals to obtain control signals for the
Amplifier Board and Harmonic Filter. In addition, the ALC control voltage for regu-
lating the transceiver output power is generated here from various analog mea-
sured signals from Amplifier board, A31, and Harmonic Filter, A32.
(3) Power Supply, A4
The Power Supply, A4, is composed of a 3-phase transformer, Regulator Board, A41,
and Mains Filter, A42. The transformer is delta-connected at the input end and the 5 sec-
ondary windings are all star-connected. The star point for secondary winding 5 is directly
configured on the transformer; the star points of the other 4 secondary windings are lo-
cated on the Regulator Board, A41.
The outputs of secondary windings 1 through 4 are connected to the Regulator Board,
A41, where the various supply voltages are generated by means of rectifiers and series
regulators. Secondary winding 5 of the transformer is configured as a 3-phase power out-
put in order to supply the RF power transistors in Power Amplifier, A3. The rectifiers and
filters are also located on Power Amplifier, A3.
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