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Re: [TenTec] repairs

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] repairs
From: Carl Moreschi <n4py3@earthlink.net>
Reply-to: n4py3@earthlink.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 29 Oct 2014 07:51:41 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
The Collins 75A4 did PBT that way. When you moved the PBT knob, it rocked both the BFO control and VFO control for simultaneous movement. It was all done mechanically.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 10/29/2014 2:51 AM, Rick - DJ0IP / NJ0IP wrote:
Hi Sinisa,

Has this technique ever been implemented in a ham radio like this?

With analog technology that would have been a very tough feat to accomplish
but with digital technology it ought to be fairly easy to do.

Of course the down side of that method would be, it moves both skirts in the
same direction, so while you are moving away from QRM on one side, you may
very well be moving into QRM on the other side.

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)


-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of shristov
Sent: Wednesday, October 29, 2014 7:34 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] repairs

Rick - DJ0IP / NJ0IP<Rick@DJ0IP.de>  wrote:

Could someone here please explain to me (technically) how PBT can work
with single conversion?


PBT (with constant filter bandwidth) is easily done with single conversion
and single filter.
Just vary VFO and BFO frequencies simultaneosly to keep the resulting
carrier frequency unchanged.

73,

Sinisa  YT1NT
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