RF OSCILLATOR

TM 11-7440-232-12/NAVELEX 0967-LP-275-5010

RF OSCILLATOR

· The stable 4.8 MHz crystal clock RF oscillator

(PIN 190-47861-01 for Code AB shelf) plugs into a

subassembly mounted in position A9 on the modem

shelf.

· Position A9 is equipped with a front retainer

plate and a bracket which mounts the oscillator output

test jack and a ground test jack. The retainer plate

contains a center hole to allow adjustment of the

oscillator frequency.

· There are no operating controls on this

module.

· Test pin-jacks are located on the front of the

module.

DATA CARRIER ALARM

· The Data Carrier Alarm (PIN 090-46841-01)

PCC module plugs into the modem shelf. It provides

delayed alarm signals for transmit data, transmit carrier,

receive carrier, and receive data signals.

· It provides individual alarm outputs if trouble

occurs in any of the monitored signal paths. The type of

alarm output used provides a fail-safe feature, in that,

failure of the circuit being monitored, failure of the alarm

circuit, or failure within the entire digital data modem will

always produce an alarm output.

· The operating control (ALARM CUTOFF

switch) and the test pin-jacks are located at the front of

the PCC module.

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