Specifications

TM 11-5820-670-30
2-26. TROUBLESHOOTING CHARTS. (CONT)
CHART 2-9
Poor Sensitivity Troubleshooting
(Sheet 1 of 2)
PERFORM RECEIVER
SENSITIVITY ADJUSTMENT
(PARA 2-35).
DISCONNECT P4902 FROM
J4902 ON IF. ATTENUATOR
WITH AN/URM-103 SET TO
11.5 MHz, 0.8 µV, 8 KHz
DEVIATION, CONNECT
DISCONNECT P4901 FROM
J4901 ON IF. ATTENUATOR
A4900. CONNECT THE AN/
URM-103 OUTPUT TO J4901.
SEE ILLUSTRATION, SH 2.
OUTPUT TO P4902. SEE
ILLUSTRATION, SH 2.
REPEAT RECEIVER SENSI-
TIVITY, QUIETING AND
LIMITING PERFORMANCE
TEST (PARA 2-7).
REPLACE IF. ATTENUATOR
A4900 (PARA 2-61).
REPLACE VHF TUNER
ASSEMBLY A1000 MODULES
A1100 THRU A1500 (PARA
2-52).
ALINE VHF TUNER
ASSEMBLY A1000 (PARA
2-35).
SEE TROUBLESHOOTING
CHART 2-5.
2-85