Hey Tom, isn't that why they went to PUSH PULL finals with a link coupled
output? Still simulates class A with a pair of class B finals...
I think a couple nice 4-1000's glowing in the rack should just about do it.
Modulate it anyway you'd like. Sometimes just sometimes the old way is the
best way.
I wonder if I could still build a link coupled final? The last time I did
one was my second novice transmitter a little 6DQ6 25 watter.
4-1000's? Whoops the only things I have pairs of here are: 3-500's 8877's
3CX3000's and YC-156's drat fresh outta 4-1000's.. Oh and you guys had me
all excited there for a minute.
BOB DD
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Tom W8JI
Sent: Tuesday, November 14, 2006 8:06 PM
To: Gary Schafer; 'KA5MIR'; amps@contesting.com
Subject: Re: [Amps] Class A for AM
> Except in class A the input power never changes. If it is
> set up for 6000
> watts input in order to provide 1500 watts output @25%
> efficiency then the
> input power will always be a constant 6000 watts with or
> without modulation
> or carrier.
>
> When it is putting out 375 watts carrier the input power
> will still be 6000
> watts.
>
> So the dissipation would be 6000 watts minus power out for
> any given output
> power.
That's the way I see it also.
Since it should make around 50% on peaks it should make
around 25% on carrier, and 3000 watts plus headroom of
standing power should do it.
It will just be useful output power minus standing zero
signal dissipation.
73 Tom
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