[AMRadio] RA1000 for parts

John Lyles jtml at losalamos.com
Thu Apr 12 01:39:08 EDT 2007

The Raytheon 1000 was one of the ugliest oversized 1 Kw boxes. It was the size of a small bathroom, and weight is comparable. The circuit was straight push pull 813s driving 833s. Everything about it was overkill. Much of the baseplate iron was oil-filled or potted. I stripped one of parts which had been in Roswell for years, and was in very horrible shape. Some of the var. capacitors had their plates partly melted and arced. It ran overheated so the tar and oil leaked on the bottom, and it had no hope of running, someone had already started scavenging by the time I got to it. So i didn't feel bad releving it of good components such as these. I certainly wouldn't recommend tearing apart at cherry RA1000, but based on the vintage and the rarety of them, chances of finding a good 'un are low. 

One more point, the iron out of this RA1000 carcass went to local hams, several who were able to build up nice homebrew AM transmitter from them. So it wasn't a total loss to the metal yard. 

> Message: 4
> Date: Wed, 11 Apr 2007 16:28:47 -0700
> From: "Bill Smith" <hbco2 at sbcglobal.net>
> Subject: Re: [AMRadio] Source of very nice inductor and variometer for
> 	ATN
> To: <jtml at vla.com>, "Discussion of AM Radio in the Amateur Service"
> 	<amradio at mailman.qth.net>
> Message-ID: <001201c77c91$29678220$0303a8c0 at hbco>
> Content-Type: text/plain;	charset="iso-8859-1"
> What a horrible thing to do to a RA1000.  :-(
> Better to put up a tuned antenna, and restore the RA1000 to service.  :-)
> 73 de Bill, AB6MT
> hbco2 at sbcglobal.net
> ----- Original Message ----- 
> From: "John Lyles" <jtml at losalamos.com>
> To: <amradio at mailman.qth.net>
> Sent: Wednesday, April 11, 2007 4:32 PM
> Subject: [AMRadio] Source of very nice inductor and variometer for ATN
> > A classic balanced line antenna tuning network can be built from the
> output components of a Raytheon RA1000 1 kW transmitter. It was one of the
> few that used push pull 833As in the RF, and had a symmetric tank with a
> huge inductor having a small motorized variometer (link coil) in the center
> for the antenna connection, and a split variable capacitor. The inductor was
> for AM band, so it has enough L to work down to 160 as well. Keep an eye
> open for RA1000s getting dumped, not too many left.
> > 73
> > John
> > K5PRO
> ------------------------------
> Message: 7
> Date: Wed, 11 Apr 2007 18:40:45 -0500
> From: "Rick Brashear" <rickbras at airmail.net>
> Subject: RE: [AMRadio] Source of very nice inductor and variometer for
> 	ATN
> To: "'Discussion of AM Radio in the Amateur Service'"
> 	<amradio at mailman.qth.net>
> Message-ID: <00a301c77c92$d3d50150$460cfb48 at Office>
> Content-Type: text/plain;	charset="us-ascii"
> Thanks for saying that, Bill.  I was about to cry at the thought of it.
> Rick

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