455 Operation Manual
Page 23
6/23/98
Audio is noisy, but
Transmission path noise may
sounds normal in other
be excessive. Check other
respects.
system components, RF power,
and antenna pointing.
In non-video systems, if the
subcarrier frequency is less
than about 4.5MHz, the high
pass filter in the receiver
may not be set OUT. (See
Section 5-17.)
Audio sounds noisy.
Channel spacing may be too
Tones, chirps, buzz, etc
close. The 455 requires 600
may also be present.
kHz ("wide") or 280kHz
("narrow") between adjacent
center frequencies to meet
all specifications. At
closer spacings some of
these symptoms may appear.
The subcarrier channel may
be co-located with one of
the harmonics of a video
signal component (e.g.,
colorburst). Shift subcar-
rier frequencies and re-
evaluate.
Total baseband power may be
too high, leading to inter-
modulation products. Reduce
the level of the subcarriers
and/or video and re-
evaluate.
In systems with video, the
high pass filter in the re-
ceiver may be set OUT.
(See Section 5-17.)
