On 25 Apr 2005 19:48:48 -0700, "Cliff" wrote
in . com:

If a CB radio is legal on wattage out, he doesn't have to clean up that
image on any of older TV models. Older TV models are horrific in
picking up 'legal transmissions' The TV/computer owner wil need to put
some filters inline to take care of the problem if the CB is legal.


Televisions have always had problems with CB radios because the second
harmonic falls right on channel 2. But that second harmonic is
supposed to be supressed (filtered) to a point where it's effect is
negligible. A stock, unmodified, untweaked radio will usually not
cause interference to a TV unless you mount the antenna right next to
the set.

The problem is the golden screwdrivers and internet techs who tweak &
peak their radios for modulation and/or power without regard to the
resulting increase of harmonics. Even if power is kept to the legal
limit, the modulation limiter can be modified for overmodulation, and
therefore cause a big increase in harmonics. This is why modification
of the radio is illegal. And modification of the radio voids your
authorization to use it, regardless of the RFI suseptibility of a TV.







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