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USING THE PPM COUNTER WITH SCA
The Peaks Per Minute counter is set at the factory
t~
detect modulation
k levels greater than 100%.
FCC rule changes permit, in certain in
• an increase in the
percentage level
modulation when using an SCA.
The Peaks Per Minute voltage references can be reset to your station's
legal modulation limit.
Refer
Section 5 "Alignment and Troubleshooting", review Section 5-2
items 1 - 11 before proceeding.
With reference
items 5-2,4
&
5.
Changing the voltage setting of TP3
&
4 by approximately 30 M.V.
+
and -
with respect to TPI
&
2 will change the PPM detection point by
approximately 1%.
The following table lists the approximate voltage settings for
TP3 and
TP4~
needed to change the PPM detection pOint.
Ex. TPI
TP2
=
3. 00 V.
' * TP3
4
*PPM%
3. OOV •
100%
3.03V.
101%
3.1SV.
105%
3. 30V •
110%
*(All values are nominal)
Recheck items
5-2~
2 through 11. Substitu
the new values where
appl
i
cab 1 e.
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