[BC] AM Radio Kit

[Cowboy]

On Saturday 04 February 2006 16:46, Robert Meuser wrote:
> 
> I did supermod on a part 15 TX when I was in fifth grade. 30 watts of 
> audio from an old PA amp.

 Had this theory, once, in days of olde, when finding legal ways to
 circumvent the intent of various rules seemed "worth" the challenge.
 Built one, and it did work, but not for the broadcast band.

 Theory was a "plate" modulated tetrode.
 Screen supply was essentially rectified and filtered modulator output,
 such that the screen voltage followed average mod fairly closely, with
 a little bias adjusted for "legal" carrier power.

 The thing would make 450 or 500 percent positive mod with little 
 noticable distortion.
 Since carrier power was measured without modulation, it was pretty
 low, since there was little screen bias, but what was the carrier
 power really, when the screen voltage came up with mod ?
 Truely, I don't know !

 Built it. It worked. I was happy. Box got disassembled for other purposes.
 Parts were scarce, and my allowance wasn't much back then.....

 Ah, the good old days !

-- 
Cowboy

http://cowboys.homeip.net

Don't hit a man when he's down -- kick him; it's easier.