SILICON VERSION A5300A SQUELCH FILTER ALINEMENT.

TM 11-5820-401-34-3/0967-LP-432-3060

5-23. A5300 SQUELCH FILTER ALINEMENT. (CONT)

11. Adjust AN/URM-103 DEVIATION control for 3.5-kHz reading on DEVIATION KHZ meter.

12. Adjust AN/URM-127 FREQ RANGE DIAL to vary frequency above and below 150 Hz while

observing ME-30(*)/U at TP5008. Stop at frequency that gives highest possible ME-30(*)/U

reading. At same time, adjust AN/URM-103 DEVIATION control to keep ME-30(*)/U reading

between 2 and 4 vac. If adjustment of DEVIATION control is required, readjust AN/URM-127

frequency for peak ME-30(*)/U reading.

13. Check and record AN/URM-127 modulating frequency as indicated by AN/USM-207 frequency

counter. If frequency is 150 1 Hz, squelch filter alinement is satisfactory. If above 151 Hz, go

to step 14; if below 149 Hz, go to step 17.

NOTE

In steps 14 and 17, maintain a voltage reading of 2 to 4 vac at TP5008 by adjusting the

AN/URM-103 DEVIATION control.

14. FREQUENCY ABOVE 151 HZ. Turn R5301 (3) counterclockwise slightly. Reset AN/URM-127

FREQ RANGE DIAL to obtain a peak reading on ME-30(*)/U.

15. Check frequency on AN/USM-207.

16. Repeat steps 14 and 15 until peak ME-30(*)/U reading is obtained at a frequency between 149

and 151 Hz.

17. FREQUENCY BELOW 149 HZ. Turn R5301 (3) clockwise slightly. Reset AN/URM-127 FREQ

RANGE DIAL to obtain a peak reading on ME-30(*)/U.

18. Check frequency on AN/USM-207.

19. Repeat steps 17 and 18 until peak ME-30(*)/U reading is obtained at a frequency between

149 and 151 Hz.

5-24. SILICON VERSION A5300A SQUELCH FILTER ALINEMENT.

PURPOSE. This procedure adjusts the gain of Squelch Amplifier A5200A in the NEW SQUELCH mode

of operation. Alinement of the A5300A squelch filter must be done before the Silicon Version A5200A

Squelch Amplifier Alinement, NEW SQUELCH Level, paragraph 5-25.

TEST EQUIPMENT AND MATERIALS

Signal Generator AN/URM-103

Matching Unit CN-901/U

Signal Generator AN/URM-127

T-Connector UG-274/U

Power Supply PP-1104(*)/G

Loudspeaker LS-454/U

Frequency Counter AN/USM-207

Voltmeter ME-30(*)/U

Test Cable No. 1

TEST SETUP. Connect the equipment as shown in test setup diagram

R-442/VRC top cover. (See paragraph 2-7.)

5-115