In article , WShoots1 wrote:
Selectivity is sort of doubtful on a lot of them,

Back in the 1950s, even 1960s, car radios were used as tunable I.Fs for HF ham
band convertors for mobile reception, like those made by Gonset.

Yes, but they weren't exactly good. Okay, they weren't any good. I built
a really neat 10M converter using a compactron from a QST project and found
the selectivity issue was pretty serious even though most folks were running
AM and the bands weren't as crowded.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."