Rick - DJ0IP / NJ0IP <Rick@DJ0IP.de> wrote:
> Actually Sinisa, what you just describe is called "IF Shift", not "Passband
> Tuning".
...
> "IF Shift" moves the entire passband of a single filter, whereas
> "PassbandTuning" moves the relative position of two filters. PBT is superior.
Well, the terminology isn't standardised well enough.
Orion's PBT works exactly as "IF Shift" in your description,
and I'd guess that Palstar rig does the same, judging from
LSB and USB marks around PBT knob.
Drake R4C had the same thing, and called it Passband Tunning,
also had LSB and USB marks around the knob.
73,
Sinisa
>
>
>
> I still maintain that PBT canNOT be accomplished with a single IF.
>
>
>
> I'm fairly certain of this, but not quite 100% certain, however
> that's the
> way I remember it from my schooling long ago.
>
>
>
> So if the TR-30A claims PBT and single IF, it is technically wrong.
>
> Then they should re-label that knob "IFS".
>
>
>
> For the record, IFS is a lot better than having nothing at all.
>
> It's just not as good as PBT.
>
>
>
> 73 - Rick, DJ0IP
>
> (Nr. Frankfurt am Main)
>
>
>
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
> shristovSent: Wednesday, October 29, 2014 7:34 AM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] repairs
>
>
>
> Rick - DJ0IP / NJ0IP < <mailto:Rick@DJ0IP.de>
> 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
> conversionand single filter.
>
> Just vary VFO and BFO frequencies simultaneosly to keep the resulting
> carrier frequency unchanged.
>
>
>
> 73,
>
>
>
> Sinisa YT1NT
>
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