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Page Title: Table 4-7. TESTING RECEIVER CIRCUITS TEST PROCEDURE (Cont'd)
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TM 11-5895-1141-34
Table 4-7. TESTING RECEIVER CIRCUITS TEST PROCEDURE (Cont'd)
Step
Operation
Normal Indication
7
Reconnect the audio oscillator. Remove
An output level of 1.1 v minimum should be
the short circuit of step 6. Adjust the
obtained across the loudspeaker; record the
oscillator for 1000 Hz, 155 mv input.
output level.
Remove the ac voltmeter from the 600 ohm
load and place it across the loudspeaker
voice coil in the audio-unit. Set the
receive select switch to the Loudspeaker
position.
NOTE
Access for the loudspeaker requires
detaching front panel from the audio unit
chassis by removing the mounting screws.
8
Connect a distortion meter across the
The percentage distortion should not exceed
loudspeaker and measure the percentage
8%.
distortion at 300 Hz, 1000 Hz and 3000 Hz,
with the signal amplitude at 155 mv for
each frequency.
9
Measure the output voltage across the
The output voltage should not be more than
loudspeaker terminals at both 300 Hz and
3 dB below the output voltage measured at
3000 Hz using an input signal amplitude of
1000 Hz in step 7.
155 mv.
4-9


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