[Boatanchors] AM Amplifier

Mon Jul 9 22:55:20 EDT 2018

Always new folks come onto every list.  As was said in Karate Kid, patience, grasshopper!

73 de Mac, K2GKK/5
(Since 30 Nov '53)
Oklahoma City, OK
USAF Retired 61-81
FAA Retired 94-10

________________________________
From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> on behalf of Bry Carling <af4k at hotmail.com>
Sent: Monday, July 9, 2018 21:48
To: Bry Carling
Cc: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] AM Amplifier

“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 https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Famfone.net%2FAmforum%2Findex.php%3Fboard%3D27.0&data=02%7C01%7C%7C4c91413b95fb416c6af008d5e60fb11d%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636667877419139774&sdata=wz2pUcQ%2Bu6RA37ybcC11%2FydyqckpZdAprbbtXOdm9hA%3D&reserved=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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