[Boatanchors] AM Amplifier

[WA5VGO]

This is, of course, absolutely right. Allowing for 6dB of headroom, you 
can expect no more that 30% efficiency. 25% is probably more realistic. 
Output power simply can not be more that 50% of the plate dissipation - 
probably less. Linear amplifiers can work on AM. The problem is the poor 
efficiency. AM broadcasters would have never run class C with high power 
modulators if they could have used linear amplifiers efficiently. I have 
a 4-1000A I use occasionally on AM. 1300 watts input power delivers 
about 400 watts of clean power.

Darrell

On 7/7/2018 5:54 PM, Dale Smith wrote:
> I suggest you visit http://amfone.net/Amforum/index.php?board=27.0 and do
> a  search or ask over there,a great site ,very knowledgeable ,especially
> about the AM mode.
> A stock ranger puts out about a  45 watt carrier.Lots of folks including me
> do a low power mod ,through the accessory plug on the back,very easy to do.
> Gives you 15 or so watts,
> that is all you will need with most desk top amps.The limiting factor is
> the power supply in these amps.That low power mod will give you lots of
> modulation power ,over 100%.
> Lets see 450 watts times 4 =1600 watts,what is wrong with this picture.
> 73/dale/ka5who