[AMRadio] Need small hf amp for am

[Geoff Edmonson]

On 01/30/2011 10:18 PM, Jim in Waco WB5OXQ wrote:
> I had to sell my titan so now I am looking for a small hf amp suitable for use on am.  My transceiver only makes 25 watts on am and I would like something that can make at least 200 out.  Anyone have something to sell contact me directly so the whole list does not have to be bothered.
> Jim Miller wb5oxq at grandecom.net.  I am good in QRZ.

I think, Jim, in order to get your amp to produce 200w out, from 25w in, 
that's still a 10:1 ratio, which means you'll need a kW or better 
capacity to modulate 200w to 100% with a little margin for error/audio 
asymmetrical, headroom...  call it what you will, but you'll need 
something around the Titan power level to modulate 100%.  200w of 
carrier, at 100% modulation with a sine-wave is 800w PEP.
Add in transients in the typical male pattern voice and occasionally 
you'll see PEP levels hit 1kW.


73 = Best Regards,
-Geoff/W5OMR