[AMRadio] AM Amps


James M. Walker chejmw at acsu.buffalo.edu
Thu Jan 13 23:22:06 EST 2005


That's a rhetorical question right?
Jim
WB2FCN


Gary Schafer wrote:
> 
> How do you reduce the drive for AM? I take it that is how you operate CW?
> 
> 73
> Gary  K4FMX
> 
> James M. Walker wrote:
> > Hum,
> > 4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA
> > Grid I, with 125 Watts out of DX-100 running apprx 2100 W input and
> > dissipating 670 watts plate = approximately 1430 watts output!
> >
> > While the carrier level into 50 ohm dummy load is 1400 watts measured
> > and a really NICE orange glow! This is with a 200 cfm blower, air system
> > socket and chimney.
> >
> > Jim
> > WB2FCN
> >
> > ----- Original Message -----
> > From: "Jim candela" <jcandela at prodigy.net>
> > To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> > Sent: Wednesday, January 12, 2005 7:07 PM
> > Subject: RE: [AMRadio] AM Amps
> >
> >
> >
> >>Darrell,
> >>
> >>That amp you built with the 4-1000 was a "killer" in more ways than one!
> >>Time for a confession..
> >>
> >>Regards,
> >>Jim
> >>WD5JKO
> >>
> >>-----Original Message-----
> >>From: amradio-bounces at mailman.qth.net
> >>[mailto:amradio-bounces at mailman.qth.net]On Behalf Of Darrell, WA5VGO
> >>Sent: Tuesday, January 11, 2005 6:04 PM
> >>To: Discussion of AM Radio
> >>Subject: Re: [AMRadio] AM Amps
> >>
> >>
> >>At 04:21 PM 1/11/2005 -0500, you wrote:
> >>
> >>
> >>>In a message dated 1/11/05 12:14:43 PM, ronnie.hull at glowbugs.com writes:
> >>>
> >>>
> >>>
> >>>>well all I can say is it works.. works well as a matter of fact, and
> >>>
> > has
> >
> >>>>been for 6 years :)
> >>>>I typically run between 350 and 400 watts of carrier every day. It
> >>>
> > looks
> >
> >>>>great on the scope. Modulation envelope is perfect. 100% modulation.
> >>>
> > In
> >
> >>6
> >>
> >>>>years Ive only lost one tube, and I accidently broke that one.
> >>>>
> >>>>
> >>>
> >>>I have to agree with Gary.   You're seeing 1600 watts PEP and 400W of
> >>
> >>carrier
> >>
> >>>OUT with a pair of GG 813s???   Does not compute!   Just curious, are you
> >>>talking about 400W INPUT power to the linear under carrier only condx
> >>>maybe?   If
> >>>so, this would work out to about 133W carrier OUT and each 813
> >>
> > dissipating
> >
> >>>about 133W which would make more sense.
> >>>
> >>>Dennis D. W7QHO
> >>>Glendale, CA
> >>
> >>
> >>I'm with Dennis and Gary. To run a linear amplifier at 375 watts of
> >
> > carrier
> >
> >>and 100% modulation, you will need around 800 watts of plate dissipation.
> >>For a short time a number of years ago, I tried running an AF-68 and a
> >>4-1000A linear amplifier. I could never get more than around 450 watts of
> >>carrier and stay linear............I didn't need a heater in the shack
> >>either.
> >>
> >>73,
> >>Darrell, WA5VGO
> >>
> >>
> >>
> >>73,
> >>Darrell, WA5VGO
> >>
> >>
> >>
> >>
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> >>
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> >
> >
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