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Page Title:
MODULATION TONE DISTORTION PERFORMANCE TEST. |
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 TM 11-6625-2975-40
2-7. OUTPUT ATTENUATOR ACCURACY PERFORMANCE TEST. (CONT)
PROCEDURE
1.
Enter frequency 108.00 MHz into test set.
Set test set RF LEVEL to 6 dBmW.
2.
3.
Remove modulation by extinguishing all TONE SELECT keys.
4.
Record power meter indication. Power meter should indicate between -6 dBm 0.5 dBm. If
not, go to troubleshooting chart 2-1, sh 7.
Set test set RF LEVEL to values listed below. Subtract level recorded in step 4 from each setting.
5.
The difference at each level should be within limits specified in the table. If not, go to trouble-
shooting chart 2-1, sh 7.
TEST SET
ACCEPTABLE DIFFERENCE
RF LEVEL (dBmW)
-7
0.5 dBm
0.5 dBm
-8
-10
0.5 dBm
-14
0.5 dBm
0.5 dBm
-20
MODULATION TONE DISTORTION PERFORMANCE TEST.
TEST EQUIPMENT REQUIRED: Distortion Analyzer HP 334A-C41
RF Cable RG-58/U with BNC plug-to-double banana plug
termination
EQUIPMENT SETUP: Connect test set to 115 vac power source.
Connect distortion analyzer to test set as indicated in the following diagram.
EL9LY014
Turn equipment on. Allow at least 30 minutes for warmup.
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