Jerry Stuckle wrote in news:lrgvk8$5er$1@dont-
email.me:

I won't get into the math here, but due to the sidebands (yes, FM has
sidebands, also - the number and strength of the sidebands is
proportional to the deviation and modulating frequency), frequency
response of the modulated signal is proportional to the bandwidth of the
channel and deviation. A 5 kHz deviation can theoretically pass up to
about 5Khz of audio, but in practice it's limited to about 3 kHz (to
avoid adjacent channel interference). This is fine for voice, but does
not work well for music (try listening to music on the AM band, for
instance).


Thankyou, that's great help. I'll have to be careful about buying one of
those widgets... I did suspect that something that had a narrower bandwidth
would reduce frequency response (based on playing with the AR-3000 on
narrowband FM). That's one reason I was wondering about boosting the
broadcast signal directly for low level rebroadcast in a building, to keep
what fidelity I can as best possible.