Sirius listening on vintage radio

[darklife]

Originally Posted by fifties

I still don't believe that you can hear an FM station -or any carrier at the FM frequency of 88-108 Megacycles- on an AM radio receiver that -at it's best moment- won't tune above 1.7 Megacycles, and can only reproduce modulation varied by amplitude rather than by a frequency.

Aside from that, however, the unit does what it's supposed to; it provides good usable signal for a distance of about 75 feet or so, using the eight foot wire that comes with it for an antenna.

I'm not talking about FM as in the broadcast band 88-108MHz. You are confusing the term FM with the broadcast band that happens to use frequency modulation.
FM and AM are modes of modulation and nothing more.
Just like the aircraft band is from 118-136MHz but they use the AM modulation mode, or some utility shortwave stations use FM for example.
What I am saying is that any change in carrier frequency from an audio source is labeled as Frequency Modulation. Any change in carrier amplitude from an audio source is Amplitude Modulation.

Yes all stations on the regular broadcast band from 520-1710KHz are suppose to be in AM mode. However a poorly designed transmitter will sometimes have a tiny bit of frequency modulation on its carrier signal, or in other words it's frequency will vary slightly with the audio program material especially on bass notes or high peaks of modulation. It's only a few tens to hundreds of hertz but that is enough to become a wobbly whining sound when demodulated by your radio.
That's the best I can do to describe this