The RF Output on each and every modulator

SMATV Headend Balancing
** RF Gain adjusts the output to distribution. This level is relative to the
size and setup of the distribution system.
It is important that the input level does not exceed the manufacturers
recommended level per channels. If the combined input exceeds the
manufacturers specifications, the amplifier can be overdriven and the
result will be poor picture quality.
** Tilt adjustment allows technicians to compensate for loss on higher
frequency channels on larger distribution systems. Since Higher frequency
channels drop off faster, the Tilt will attenuate the lower frequencies in an
attempt to keep all channels balanced.
Unless there is a noticeable drop on the higher frequencies when measured
at the furthest distribution point, you will not need to adjust the tilt. Leave this
adjustment turned completely counter clockwise when not needed.
-30dB
HCA3086RK
TEST
RF GAIN
-30dB
TILT
RF
AUDIO
AURAL
VIDEO
OUTPUT
DEVIATION
LEVEL
MOD
12
HSM55
** The RF Output on each and
every modulator must be the
same prior to the combiners and
amplifier. It is recommended
that the signal level meter be
connected to the line on the
input of the amplifier. NEVER
use the test port on the amplifier
to balance your headend; the
result will be an improperly
balanced headend.
TEST
** Audio Deviation adjusts the
volume level as heard through
the television. For adjustment,
it is recommended a television
set be connected at the
headend and the source
connected to the Audio in on
the modulator be the same on
all modulators. For example,
on a SMATV system, use the
same preview channel on all
receivers while balancing.
** Aural Level adjusts the level
difference between the Audio
Frequency dB level and the
Video Frequency dB level. It is
recommended these levels be set
14-16dB apart. Most all signal
level meters have a Video/Audio
option on them specifically for
this
adjustment.
If
this
adjustment is not properly set on
all modulators, audio carriers can
affect adjacent channels.
** Video Modulation allows
technicians to compensate for low
video levels on the input of the
modulator. For adjustment, it is
recommended a television set be
connected at the headend. If the
picture on the television appears
dark, the modulation level should
be adjusted clockwise.
If the
picture on the television appears
bright, green, or sharp image
fluctuations on certain objects, the
modulation level should be
adjusted counter-clockwise.
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