CIRCUIT SELECTOR Switches (cont)

11-6625-467-34

input connects to the front panel connector RF VM1.

not related to the 30-megahertz oscillator). Note

By the use of an RF jumper cable, the 30 MC jack is

that R2-3 receives an input from S6B-4. Refer to

c o n n e c t e d to the RF amplifier/detector circuit

figure FO-3 again and note that wafer S6B (CIR-

through the RF VM1 jack.

CUIT SELECTOR D) has an input of +27.5 volts dc.

(3) Next the output of the RF amplifier/detec-

In position 3, the movable contact connects +27.5

tor circuit must be connected to the TEST METER.

volts S6B-4 which is connected to terminal 3 of

The RF amplifier/detector circuit output (XA13-P)

HIGH FREQ AMPL control R2.

connects to three places: S4A-5, S4A-6, and S4A-7.

(2) So far, note that if CIRCUIT SELECTOR D

is in position 3 and CIRCUIT SECLECTOR C is in

Refer to figure FO-3 and note that the output of

position 7 or CIRCUIT SELECTOR A is in position

S5A connects to S3A-2 and the output of S4A con-

nects to S3A-1. The output of switch S3 connects to

O, +27.5 volts is connected to the HIGH FREQ

A M P L control which acts as a variable voltage

the TEST METER through the PRESS TO TEST

divider. The movable arm of the voltage divider con-

switch. From the above it is seen that, with a pro-

nects to the input of the 30-megahertz oscillator

gram setting of 04X3 or 05X3, the 30-megahertz

through one or two paths, S3 or S5. Therefore, with

oscillator is activated and connected to the TEST

METER. Position 6 of S5 cannot be used because S5

a CIRCUIT SELECTOR program setting of 0XX3 or

XX73, the 30-megahertz oscillator operates and pro-

must be in position 7 to connect the HIGH FREQ

AMPL control output to the 30-megahertz oscillator

duces a 30-megahertz output at XA1l pin C. Note

that XA1l pin C connects directly to J25, a front

if S3 is not in position O. Pushing PRESS TO TEST

panel connector labeled 30 MC. The RF amplifier/

switch S2 connects the RF amplifier/detector cir-

detector circuit must be used to measure the ampli-

cuit output to the TEST METER. The 30-megahertz

tude of the 30-megahertz output signal. In figure

oscillator can now be set for any specified reading

FO-4, note that the 50-ohm RF amplifier/detector

by adjusting the HIGH FREQ AMPL control.

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