[AMRadio] AM Usage with Linear AMPS


Ed Swynar gswynar at durham.net
Mon Nov 22 08:03:16 EST 2004


Ralph,

A good rule of thumb to follow is simply this: the maximum carrier output
you're going to safely get out of your separate linear amplifier is limited
to HALF of the plate dissipation of your linear's tube(s)...

Example: I sometimes drive my HB 2 x 813 as a linear for AM. Each tube has a
plate dissipation of 125-watts. HALF of that is 62.5-watts, so with 2 tubes,
it'll be 125-watts carrier output MAXIMUM.

I adjust my drive to the linear, watching the output power meter, until
125-watts is achieved. I might "tweak" the plate tuning capacitor after this
is done. It takes some 10-12 watts of AM to get 125-watts out of the 813s.
When speaking into the mic, I always watch the trapezoidal pattern on my
SB-610 'scope, & make sure I have enough audio.

Hope this helps!

~73~ Eddy VE3CUI - VE3XZ



----- Original Message -----
From: "Ralph Daniels" <rbdaniels at msn.com>
To: <amradio at mailman.qth.net>
Sent: Monday, November 22, 2004 7:54 AM
Subject: [AMRadio] AM Usage with Linear AMPS


> Hi all,
>
> I feel this subject must have been covered many times but I just can't
find it.
>
> Specifically, I have a Heathkit HX-10 Marauder driving an Ameritron
AL-811H
> on CW and SSB and would also like to try it on AM. The driving power on AM
> is 25 watts.
>
> Is this a correct use of the amplifuer and if so what are some operationa
> guidelines as regards i/p and o/p power, duty cycle, cooling etc.
>
> Thanks in advance,
>
> Ralph Daniels, N1SK
>
>
>
> ______________________________________________________________
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio at mailman.qth.net
>





More information about the AMRadio mailing list

This page last updated 14 Dec 2017.