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John Higdon · January 29th 07, 04:13 PM posted to ba.broadcast,rec.radio.shortwave

In article ,
(Alan) wrote:

Huh? The addition of FM involved a VHF front end, a different mixer
oscillator operating in the VHF range, different mixers, a different
detector, and in those days, AFC functions to deal with the problem
that the local oscillator drifted.

Not to mention another IF strip. And in those days, VHF was literally
magic. When I was a kid, I built the Heathkit AM and FM tuners. The AM
tuner worked at power up. A couple of tweaks and it was ready for
action. The FM was stone dead when it came to output. I ended up taking
it down the street to an older kid's house (he was a ham) and he bench
aligned it for me; no other "repairs" were required. FM was touchy in
those days.

Now, VHF is practically DC.

--
John Higdon
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