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reduce the sensitivity by tuning the potentiometer half or fully
anticlockwise. This has the effect of reducing the background noise
coming lip in speech pauses. The compressor ensures that the trans-
mitter is still fully modulated by the speech signal.
7.9.2.
Realigrment of 244 R15:
Control settings:
SUPPI.Y switch: STANI) BY.
I. Connect oscilloscope to test point 244 TP7.
2. Un§older broti7ri lead to terminal 244-4.
3. Set potentiometer 244 R15 to the middle of its range.
4. Press TUNE button and adjust Sensitivity of oscilloscope to give
full screen peak to peak clef lection.
5. Resolder brouri lead to teminal 244-4.
6. Press TUNE button and adjust 244 R15 to give exactly the Sane de-
f lection on oscilloscope as before.
7.9.3.
Realignment of 244 R44, Balance:
Control settings: SUPPLY switch: STAND BY
MODE switch:
A3J
1. Comect oscilloscope to the hot el`d o£ 244 R61.
2. Adjust potentiome[er 244 R44 for uininm de£1ection oa oscilloscope.
7.9.4.
Realignemic of 244 R48, Carrier Level:
Control settings:
SUPPLY switch: STAND BY
rol>E switch:
A3H
1. Connect oscillo§cope to 244 C44/244 L6.
2. Press TtJNE button and adjust 8en§itivity of oscilloscape to give
full screen peak to peak clef lection.
3. Unsolder grey lead to
4. Press TUNE button and
deflection as before.
terminal 244-13.
adjust 244 R48 to give exactly the sane peak
5. Resolder grey lead to teminal 244-13.
Above procedure implies that 244 R15 is correctly adjusted (paragraph
7. 9.2. ) .
7.9.5.
Realignment of 244 Tl:
Control settings: SUPPLY
1. Connect o§cilloscope
2. Press TUNE button and
oscilloscope.
Switch:
STANI) BY.
to test 244 TP7
adjust 244 Tl for tDaximm clef lectiotl on
7-3
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