Resistor Selection Table

TM 11-5820-509-35

(7) Connect the rf probe of the multimeter to

NOTE

test jack J3 of the 0-1032/PRC-47 (fig. 3-53) and select

A more rapid selection of resistor

a value of capacitance for C20 (fig. 3-53 and fig. 7-13)

and capacitor values can be made if

from the table above that provides maximum voltage at

the component is clipped into the

J3.

circuit temporarily.

All selections

(8) The multimeter reading in step (7) must

may be soldered at the conclusion of

read 1.5 0.2 volts rms. Adjust the value of R30 using

the procedure just before final retest.

the selections from the table below to obtain this output

(6) Adjust the signal generator output

reading.

Figures 3-53 and 7-13 locate the parts

frequency to 2970 kHz at the output level established in

involved in this procedure.

step (4).

Resistor Selection Table

Value

Part No.

Value

Part No.

2700 270 ohms

RC07GF272K

10000 1000 ohms

RC07GF103K

3300 330 ohms

RC07GF332K

12000 1200 ohms

RC07GF123K

3900 390 ohms

RC07GF392K

16000 1500 ohms

RC07GF153K

4700 470 ohms

RC07GF472K

18000 1000 ohms

RC07GF183K

5600 560 ohms

RC07GF562K

22000 2200 ohms

RC07GF223K

6800 680 ohms

RC07GF682K

27000 2700 ohms

RC07GF273K

8200 820 AA ohms

RC07GF822K

(3) A clear, stable 5:1 Lissajous pattern must

(9) Move the rf probe of the multimeter to test

be observed as the signal generator is varied from 2.90

jack J4 of the module (fig. 3-53) and select a value of

to 3.10 MHz. Select a value of capacitance for C29

capacitance for C25 (figs. 3-53 and 7-13) from the list

from the capacitor selection table above that provides

in the capacitor selection table above until maximum

this clear, stable 5:1 pattern. (Refer to figs. 3-52 and 7-

output voltage is obtained at 2970 kHz.

13 for part locations. )

(10) The multimeter reading in step (9) must

(4) Adjust the signal generator output

read 1.5 0.2 volts rms. Adjust the value of resistance

frequency to 2970 kHz and maintain the output level

for R45 using the values listed in the resistor selection

used in step 12).

table above to obtain this output reading. (Figures 3-53

and 7-13 show the locations of parts.)

(5) Connect the rf probe of the multimeter to

test jack J1 of the module (fig. 3-52) and select a value

(11) At the conclusion of these adjustments,

of capacitance for C34 (figs 3-52 and 7-13) from the list

solder all resistors and capacitors and repeat the

in the capacitor selection table above that provides

procedures listed in step d.

maximum output at J1.

f. Locked Oscillator Q8 and 100-kHz Amplifier

(6) The multimeter reading in step (5) must

Adjustment.

read 1.5 0.4 volts rms. Adjust the value of resistance

NOTE

for R46 {using the selections from the table above to

Perform these procedures only if the

obtain this output reading). Figures 3-53 and 7-13

stability or output level of the 100-

locate the parts involved in this procedure.

kHz amplifier circuits is deficient.

(7) Repeat the procedure of step d after

The locked oscillator and amplifier

permanently soldering all resistors and capacitors in

adjustments are performed by

place within the module.

selecting

specific values for

(8) Proceed to step d (12)

capacitors C29 and C34 and resistor

R46.

g. final Frequency Calibration.

(1) Connect the oscilloscope horizontal input

(1) Before beginning this procedure, attach

to the test fixture at connector 500 KHZ A2, and connect

the cover to the module and install the O-1032/PRC-47

the oscilloscope vertical input to the test fixture at

in the test fixture.

connector 100 KHZ A1.

(2) Connect the frequency counter to

connector 500 KHZ A3 on the test fixture, and then

NOTE

place the +20V ON-OFF switch to ON.

The signal generator and frequency

counter remain connected to the

NOTE

junction of Q4-R23-R24 (fig. 3-53) as

Do not begin the calibration

in step d (3).

procedure for at least 1 hour. The

(2) Adjust the signal generator output

unit must be

frequency to 3.00 MHz and set the output level to the

value established in step c(3)

6-30