[AMRadio] Lowest level modulation


Brian Carling bcarling at cfl.rr.com
Thu Dec 23 05:49:43 EST 2004


Oh Cool - an EL34 transmitter circuit.

Jim, you may want tio compare note swith SV1DAF as he is doing 
this sort of thing in Greece.

See:
http://www.af4k.com/sv1daf.htm

Merry Holidays - Brian, AF4K

On 22 Dec 2004 at 20:22, Jim candela wrote:

> 
> 	Ed,
> 
>     My recent EL-34 project runs linear AM with a single tube biased and
> driven for AB2. With a resonant tank circuit on the plate you don't have to
> run class A for single ended class linear amplifier. You are correct for
> most audio circuits however.
> 
> Regards,
> Jim WD5JKO
> 
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of Edward B Richards
> Sent: Wednesday, December 22, 2004 8:07 PM
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] Lowest level modulation
> 
> 
> I would not modulate the oscillator, Steve. You would probably get more
> FM than AM. Low level means the early stages of a transmitter. You should
> have a buffer stage between the osc and the mod to prevent pulling the
> osc during modulation. All stages after the modulator have to be linear.
> That means class A for a single tube or class AB or B for push-pull
> stages.
> 
> 73, Ed Richards K6UUZ
> 
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