"Highland Ham"
wrote in
message
...
Can the Sirius radio be set to a different FM
frequency?
===============
If your Sirius Radio has an audio output and
your car radio a cassette
player ; you will be able to either homebrew or
purchase an audio cassette
shaped transducer with an audio input ,which
you stick into the cassette
player , such that by "playing the transducer"
you can listen to its audio
input being the audio output of the Sirius
radio.

Until recently, all of the sat radio boxes came
with a fake cassette of this type. Since cassette
players have vanished from new car radios, the FM
modulator is the answer these days.

I too have the interference problems using the FM
output from my XM. Fortunately my car radio still
reads cassettes. We have strong FM stations every
400 kHz around here, in some cases stations in the
Balto/DC area are just 200 kHz apart.

One of the serious problems using the FM approach
is that one must set the audio level far below
what you get from over-the-air FM stations. FM
stations process their audio to be LOUD, yet do
things to negate the 75 us preemphasis curve.
Your XM/Sirius FM modulator doesn't have all that
fancy processing, so you may have to set it as
much as 10 or 15 dB lower in level to avoid
overdeviating.

The only really good way for sat radio is a direct
audio connection of some type.