In article , --exray-- writes:

I once had an Ameco VFO (VFO-621?) that had a simple little varicap
modulator circuit built in. It sounded great. I bet you could find
such mods in some of the older magazines.

Long ago, like early '70s, Popular Electronics mag had a short article on how
to FM a 6m rig with a varicap diode across the oscillator tank. Very short
parts list, and the most expensive item was probably the phone jack for the mic
input.

BTW, this article suggested FM as a way to reduce TVI -- not clear why it would
be less messy on TV picture or sound than an AM signal. SSB was blissfully
rare on VHF back then. --Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.