03-09-2019, 09:13 PM
I think you mean frequency coverage. Bandwidth typically refers to narrow or wide the IF stage(s) will pass.
For instants the typical bandwidth for FM is 300kc and AM is 10kc.
The frequency coverage or tuning range for FM is 88-108mc (Modern) and Pre war is 42-50mc but the signal width is the same.
>I wonder when that change occurred.
It was right after WWII. There were a few sets that have both FM bands (referred to as the FM 50 and the FM 100 bands) These where built in '46 or so. I don't think Philco made one w/both Zenith did. The demise FM 50 band was TV it was use for channel 1or2 I forget.
For instants the typical bandwidth for FM is 300kc and AM is 10kc.
The frequency coverage or tuning range for FM is 88-108mc (Modern) and Pre war is 42-50mc but the signal width is the same.
>I wonder when that change occurred.
It was right after WWII. There were a few sets that have both FM bands (referred to as the FM 50 and the FM 100 bands) These where built in '46 or so. I don't think Philco made one w/both Zenith did. The demise FM 50 band was TV it was use for channel 1or2 I forget.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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