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Page Title: CONTROL, RADIO SET C-7088/ARC-131 FUNCTIONING-continued
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TM 11-5820-670-30
1-59. CONTROL, RADIO SET C-7088/ARC-131 FUNCTIONING. (CONT)
When SQUELCH switch S9106 is set to TONE, the ground at contact 7 is connected through contact 8
to contact 9 on the rear wafer of S9105A. This ground is applied to pin X of connector J9101 only when
the mode control switch is set to T/R or RETRAN position. From pin X, the squelch tone ground is
connected through the interconnecting wiring and is used to operate the tone mode relays in the
audiofrequency amplifier assembly.
Tone mode relays K5503, K5504, and K5505 (not shown) perform the required switching for the
squelch filter and receiver-squelch amplifier. When the received signal is modulated by a 150 Hz
tone, the receiver-squelch amplifier tone rectifier circuit will unsquelch the receiver-audio amplifier.
Homer operate voltage is also applied from contact 7 of S9105A front through current limiter R9101, to
pin GG of connector J9101. This voltage is used to operate the homing indicator flags. Operation of
the flags depends on the ground return. This ground return is provided by the squelch relay in the
audiofrequency amplifier when sufficient signal is received to cause unsquelching. The ground is
connected, as in RETRAN operation, from the audiofrequency amplifier, through interconnecting
wiring to pin Y of control unit connector J9101.
As in RETRAN operation, SQUELCH switch S9106 must be set to either CARR or TONE position. From
J9101 pin Y, ground is connected to contacts 11 and 12 of S9106. With switch S9106 positioned to
CARR or TONE, contacts 11 and 12 are connected to contact 1 which is connected to contact 9 on the
rear wafer of S9105B. In HOME position, contacts 9 and 10 are connected and the ground is applied to
pin FF of connector J9101 of the control unit and then to the homing indicator to operate the flags.
The homing indicator horizontal (signal strength) needle is controlled by the signal voltage from the
homer assembly. The signal strength voltage is coupled from the receiver-transmitter unit to pin MM
of control unit connector J9101. From pin MM, the signal strength voltage is connected to contact 6 on
the rear wafer of S9105B.
In HOME mode, contact 6 connects to contact 5. From contact 5, the signal strength voltage is
coupled through pin NN of J9101 to the homing indicator. The homing indicator horizontal needle
negative terminal is returned to the homer assembly in the receiver-transmitter.
1-66


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