[TenTec] PBT question

[Thomas C. Jednacz]

You are correct Paul. All adjustments must be done by the manual. I was
unable to bring one of the oscillators on to the frequency set by the manual
and this was exacerbated by the asymmetry of the filter. Frequency readout
is within 5 hz of WWV (using a 1 KHz offset frequency and a audio spectrum
analyzer). I am thinking about the Inrad filters. Might give them a try.

Tom, W7QF

> -----Original Message-----
> From: tentec-admin@contesting.com [mailto:tentec-admin@contesting.com]On
> Behalf Of Paul Christensen
> Sent: Monday, September 03, 2001 14:50
> To: tjednacz@ieee.org; ditzian@alltel.net; tentec@contesting.com
> Subject: Re: [TenTec] PBT question
>
>
> It's best to adjust the BFO carrier frequencies pursuant to the Ten-Tec
> manual.  Adjusting the BFO by ear will likely yield an inaccurate
> frequency
> display when you are netted in SSB or zero beat with the SPOT
> oscillator on
> CW.   However, oftentimes the result is "thinner" received audio
> on SSB when
> the manual's frequencies are used.  Some Ten-Tec filters are better than
> others, depending on the filter symmetry.  The INRAD filters appear to be
> more symmetrical across production samples.
>
> -Paul, W9AC
>
> ----- Original Message -----
> From: "Thomas C. Jednacz" <tjednacz@ieee.org>
> To: <ditzian@alltel.net>; <tentec@contesting.com>
> Sent: Monday, September 03, 2001 14:39 PM
> Subject: RE: [TenTec] PBT question
>
>
> > Adjust the pass band tuning to what you want to hear. Do not
> need to have
> it
> > set at one spot. You will use it to either cut the high or low frequency
> > interfering station. The filters do not track in USB and LSB because of
> the
> > design of the Omni VI. One end of the filter is used for USB
> and the other
> > end is used for LSB. As a result it is very difficult to adjust the
> > oscillators so that the receive frequency starts at the edge of the
> filter.
> > My Omni VI+ is set up correct for LSB & CW but I cannot set the
> oscillator
> > to get it to the edge of the filter for USB. As a result the 1.8Khz
> filters
> > ( one in each IF) cut different frequencies. One cuts the lower
> frequencies
> > and the other the highs making the pass band to narrow for
> intelligence if
> I
> > try to use both filters. Great rig - get used to the way it work and you
> > will be OK.
> >
> > Tom, W7QF
> >
> > > -----Original Message-----
> > > From: tentec-admin@contesting.com
[mailto:tentec-admin@contesting.com]On
> > Behalf Of ditzian@alltel.net
> > Sent: Monday, September 03, 2001 11:32
> > To: tentec@contesting.com
> > Subject: [TenTec] PBT question
> >
> >
> > I have a situation similar to many Omni VI owners.  The PBT does
> > not seem to sound the same for USB and LSB.  I can find a spot in
> > the PBT tuning range where the noise sounds the same as I switch
> > between LSB and USB, but this does not seem to be the same
> > spot as where the received SSB signal sounds best, nor is it the
> > same place for different 6.3 filter settings.
> >
> > Can someone tell me the significance of this point?  I suspect that
> > it is simply an artifact of the (mis)alignment, but perhaps there is
> > something else I should know.  Should I normally leave the PBT at
> > this point, unless I have to get rid of QRM?
> >
> > Thank you.
> >
> >
> > 73,
> > Jan Ditzian
> > KX2A
> > kx2a@arrl.net
> >
> > _______________________________________________
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> > TenTec@contesting.com
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> >
>
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