Re: [TenTec] repairs

[Carl Moreschi <n4py3@earthlink.net>]

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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