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7.
COMPOSITE EXT INPUT AIJ13 -
s input allows a compos;
signal
~.
to be appli
the Stereo and SeA circui
the monitor bypas-
sing the
RF
8.
COMPOSITE EXT
level.
Control AIR4 - Sets external composi
signal
9.
COMPOSITE Switch AIS16 - This
tch must be
in
INT position to
use
RF
demodulator.
In EXT position signal appli
to COMPOSITE EXT INPUT
AIJ13 is fed to stereo and SCA circuits.
3-3
MONAURAL MEASUREMENTS
1.
Total Modulation
the
FREQUENCY thumbwheel
the desired frequency and
MUTE switch to
ON.
Verify that L.O. UNLOCK led ;s out and that RF LEVEL
OK 1
is lit.
Allow a few
for
monitor to
lize on
frequency selected.
Adjust
MOD thumbwheel to the desired 1
The amber PEAK MOD lamp will
ash for 2
4 seconds each time the modu-
lation exceeds
preset PEAK MOD
level in
ther a positive or nega ve
rection.
TOTAL MODULATION meter responds to total modulation with
FCC specifi
ballistics and may be switched to read either positive or
negative modul
on with the MOO METER
POS
or
NEG
pushbuttons.
Total Peak Mod Flasher and Total Modulation Meter will
only agree
if
the transmitter is modulated by a low di
tion sine wave.
Any distortion will cause positive
nega-
tive assymmetry approximately double the amount of the dis-
tortion in percent.
that the flasher reads
highest polarity and that
meter reads the sel
polarity.
The difference in read;
with program material
is due to many factors such as the
of audio dynamic
range compression. transmitter overshoot, program assymmetry,
etc.
The 100% PEAKS PER MINUTE
counts
number of positive or negative
ks occurin within one minute.
This counter was
igned to show
campI ance with
ATS rules.
Therefore, it counts 5 millisecond peaks
as per FCC rules
.342(b)3.
However, the required PEAK MOO flasher must
remain lit for 2
4 seconds
time it triggers
FCC rules 73.
(D)4i.
This means that it is possi
e to get many ATS 5 mil isecond peaks during one
ash of the PEAK MOD flas
r.
Since
ATS rules allow 10 (ten) 100% 5 milli-
second peaks
minute, the readout
at 10 and has a maximum count of
19.
It
cally
at one minu
intervals
may be man
ly reset
or turned off with its
ated switch.
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