[TenTec] PBT and other issues.

[Dave Edwards]

I still have a 303, and a 301.  In many ways, you made the better choice!
...Dave


On 10/29/14, 9:54 AM, Tony wrote:
> ‎Changed the subject away from Ten-Tec repairs.
> I always wanted a Collins system but could never afford it. So... I got the poor men's Collins and purchased the Heathkit SB-303‎ and matching TX and was very happy with it. No PBT but in the 70's we didn't need it as much as now.
> 73, Tony VE3DWI.
>
> Sent from my BlackBerry 10 smartphone on the Bell network.
>    Original Message
> From: Rick - DJ0IP / NJ0IP
> Sent: Wednesday, October 29, 2014 09:41
> To: 'Discussion of Ten-Tec Equipment'
> Reply To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] repairs
>
> GM Carl,
>
> I didn't know that. I've seen these radios but never used one.
> My first Collins encounter was with the S-Line and KWM-2 when I was in the
> Army.
>
> The "Gold Dust Twins" as it and its matching TX were known by, cost about as
> much in adjusted dollars back then as two Hilberling PT-8000s cost today.
>
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Carl
> Moreschi
> Sent: Wednesday, October 29, 2014 12:52 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] repairs
>
> 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 at 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 at 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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