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Honeywell
COMPONENT MAINTENANCE MANUAL
PART NUMBER 964-0452
I.B.1516A Page 43
Mar 30/01
23-12-01
4
Transmit/Receive relay
Transmit/receive relay, K1, connects the receive signal from the antenna to the
receiver and switches the RF-power from the amplifier to the antenna.
5
BITREL circuit-breaker
The BITREL signal actuates a relay, which switches to 47B during test opera-
tion. This test facility permits short time monitoring of part functions of the Har-
monic Filter under HF power.
6
Modem
The modem in the Harmonic Filter and the modem in the Antenna Coupler re-
place the conventional multiple cable between the units. Now only a screened
HF cable is necessary for transfer purposes.
The modem effects the transfer of the following signals, independently of each
other, from the Transceiver to the Antenna Coupler via the inner conductor of
the HF cable:
1. HF frequency 2 to 29.9999MHz (receive signal or transmission power)
2. Serial Data from transceiver to antenna coupler, carrier frequency 105kHz
3. Serial Data form antenna coupler to transceiver, carrier frequency 240kHz
4. Direct v28V (+19V to 31V) to supply the antenna coupler.
The modem consists of a transmitter, a receiver, 2 combined, series-parallel,
resonant circuits, a high-pass filter, and a direct-voltage coupling.
Operational amplifier, N2, of the transmitter oscillates at 105kHz on the basis of
its connection; N3 amplifies the signal. The signal passes to jack X36 via the se-
ries-connected, series-parallel, resonant circuit configured for thfis frequency.
V37, V34, and V36 function as switches and cause the oscillator to pulsate or
rest in step with the applied CPLTX pulses. The receive signal passes from jack
X36 via the series-parallel, resonant circuit (resonant frequency 240kHz) to V31
and D1.
The circuit around monostable multivibrator with timer, R51, C126, is configured
such that only the slow pulses, in this case the CPLRX signal, penetrates the
circuit by means of the post-trigger.
The CPLPS supply voltage of the antenna coupler passes via decoupling coil
L16 to jack X36. A high-pass filter between the directional coupler and the mo-
dem allows only HF frequencies to pass unobstructed; the direct voltage and
modem frequencies, on the other hand, are blocked.
(4) Power Supply, A4
(a)
Regulator Board, A41
1
Introduction
Regulator Board, A41, houses the rectifier diodes and series regulators or cur-
rent-limiting circuits for the vo5V, +15V, 15V, +28V, 28V
EXT
, and CPLPS,
as well as monitoring facilities for detection of faults or impermissible operating
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