[AMRadio] AM Amps


CHRIS PAPAIOANNOU amateur at ipnet.gr
Tue Jan 11 13:58:02 EST 2005


it's 500 Watts over here this limit.
Chris SV1DAF.
----- Original Message -----
From: "Robert M. Bratcher Jr." <bratcher at pdq.net>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Tuesday, January 11, 2005 6:43 PM
Subject: Re: [AMRadio] AM Amps


> At 04:31 AM 1/11/2005, you wrote:
> >73s to all,
> >regarding Dick's problem i'd try to match 1st the Ranger's output pwr
with
> >the needed input pwr of one of the amps.The choice of the amp depends on
the
> >output pwr someone wants to "push on the air".Saw a Ranger there in Ebay
and
> >think it's using something like 6L6s or anyway not high power output
tubes.
> >"Playing"with the outputs B+,or grid HV or grid pollution resistance,in
> >order to reduce or increase the output pwr and match it with amp's input
> >it's easy.Resistances for the B+ and grid HV and a meter to measure.The
> >greatest the 2nd grid resistance is in value the worst.It's "pushing hard
on
> >limits" the tube depending on the B+ and grid voltages also.
> >Hope it helps,
> >Chris SV1DAF.
>
> If I wanted more than 100w of AM (out of my Collins 23V-3) then I'd use it
> for carrier only then plate modulate an amplifier with a modulation
> transformer (if I could find one) plus a speech amp. Then I'd run the
> maximum legal AM power of 375 watts.
>
> But then I run AM on the KW-1 (pure DSB AM) & sometimes the KWS-1 (which
> does carrier plus one sideband) at the 375w limit. I'd prefer to do AM at
a
> kilowatt but thats not legal anymore.
>
> I wonder how many AM'ers run more than the legal 375 watts? I've thought
> about it...
>
>
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