POWER SUPPLY ASSEMBLY OPERATION.

TM 11-6625-2975-40

1-18. RF SECTION OPERATION. (CONT)

The rf strip line assembly A3A1 produces a signal that is the rf carrier frequency. It also produces a

demodulated signal which is the modulated signal with the rf carrier removed, The rf signal is supplied

to the counter I/O board A3A3 and the demodulator signal to demodulator/ale assembly A3A2.

Counter l/O board A3A3 counts the rf signal to determine the output signal frequency. This information

Is supplied to the counter l/O board A3A3 output ports. When the cpu requests the frequency count,

this information is supplied to the cpu through the control bus. The cpu uses this frequency count to

supply frequency information to be displayed in the FREQUENCY display of the front paneI. When

requested by the cpu, counter l/O board A3A3 supplies phase-lock information from the I/O port over

the control bus. The cpu uses this information to supply data to the front panel assembly for the control

of RF STATUS-PH LOCK indicator.

The demodulator signal from rf strip line assembly A3A1 is supplied to demodulator/ale assembly

A3A2. This signal is used to level the rf carrier and to linearize the modulation signal supplied to rf strip

line assembly A3A1. The demodulation signal is also supplied to the DEMOD connector on the rear

panel. When the rf output is within specified limits, a calibration signal is supplied to an l/O port on

counter I/O board A3A3. This calibration status information is continually being sampled and the

information returned over the control bus to the cpu. The cpu uses this calibration status information

for supplying data to the front panel assembly RF STATUS-LEVEL CAL indicator.

1-19. POWER SUPPLY ASSEMBLY OPERATION.

EL9LY010

The test set can operate on either 115 or 230 vac, 50/60 Hz power supply. The power supply assembly

produces + 24, + 15,-15, + 12, +9, and + 5 vdc for the test set operation.