[Boatanchors] AM Amplifier

[Bry Carling]

“Classy” meant to say CLASS C. 

Durn phones! :)

Best regards - Bry Carling,





> On Jul 9, 2018, at 1:25 PM, Bry Carling <af4k at hotmail.com> wrote:
> 
> Interesting comment. However contrary to the most manufacturers a really high powered a.m. transmitter‘s have used low level modulation or screen modulation for decades. Not classy with plate modulation. That went out along time ago.
> 
> Also, hasn’t this subject being thrashed to this numerous times on this group over the last 5 or 10 years?
> 
> Most of the comments I’m reading here seem to be carbon copies of other messages sent over the last few years.
> 
> Best regards - Bry Carling, AF4K
> 
> 
> On Jul 7, 2018, at 9:39 PM, WA5VGO <hbrnut at suddenlink.net<mailto:hbrnut at suddenlink.net>> wrote:
> 
> 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
> 
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