[Heathkit] Heath AT-1 info

[John Page]

Thats all I get out of mine. About 8 watts. John

John Page K4KWM
Hollow State since 1953
(ex W8PKU,N8BLB,NA8O)




>From: Edward B Richards <zuu6k at juno.com>
>To: wa7fab at cdsnet.net
>CC: heathkit at mailman.qth.net
>Subject: Re: [Heathkit] Heath AT-1 info
>Date: Sun, 1 Oct 2006 00:28:16 -0700
>
>Hi Van;
>
>Sounds like a matching problem. Not loading right. What is your SWR?
>Check PA for wiring errors, shorts, opens, solder splashes, lose wire
>ends, etc. Especially the loading capacitor. Good luck.
>
>73, Ed Richards K6UUZ
>Simi Valley, Ca 93065
>Home of the Air Force 1 pavilion
>
>On Sun, 1 Oct 2006 00:15:17 -0700 "Van K7VS" <wa7fab at cdsnet.net> writes:
> > Interesting:  I don't know if anyone else has actually spent any time
> > using
> > one but I have discovered the following:  Mine has 485 volts DC
> > under load,
> > key down and 535V DC key up.  Original iron vane meter shows 58 ma.
> > into a
> > 52 ohm dummy load.  That amounts to 28 watts input.  Heathkit says
> > in the
> > older catalogs approximately 25 to 30 watts input.  However, one
> > would think
> > that you should see minimumly  50% effeciency.  Not even close!!
> > Using a 50
> > watt slug thru my bird wattmeter I see 8 watts output.  I see 7
> > watts output
> > thru my Waters Dummy load/wattmeter so will assume that the power is
> > about 8
> > watts out.  Now that is looking at minimum dip  of 58 mills into the
> > dummy
> > load.
> >
> > What gives???  I have tried several 6L6 tubes and still see the same
> > output.
> > Have replaced all the old postage stamp mica's with new brown silver
> > mica
> > units and checked for loose grounds, tightened screws around the
> > plate
> > circuit where appropriate and so forth. And have plenty of grid
> > drive using
> > a PR crystal on 3650 Khz.
> >
> > Still 7 to 8 watts output.  Does that sound right.  Has anyone else
> > checked
> > the output (not with a lightbulb!!) but with a reasonably well
> > calibrated
> > wattmeter?  Should I not get at least 12-15 watts output??
> >
> > When I was a kid (14) and a novice I built one of these as was my
> > second
> > novice transmitter.  Admittedly, I lived in W1 Land (MASS) and
> > worked
> > stations all over New England and south in Virginia and West back
> > around
> > Indiana and Ohio so I know it worked pretty well.  But maybe I was
> > one of
> > the first QRPers!  Or anyone running an AT-1 back then was as well.
> > HI HI.
> > Any comments about the output I am seeing would be appreciated.
> > Thanks.
> > Van. K7VS (first licensed as WN1ZLK in 1953)
> >
> > _______________________________________________
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> > ** For Assistance: dfischer at usol.com **
> > $$ See the vintage area on the HCI web site - http://www.w9wze.org
> > $$
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> >
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