[TenTec] Omni VI mystery

Mon Apr 28 17:24:30 EDT 2014

Look at section 4-14 for the Tx audio board.  You will need a very accurate freq counter and a lot
of patience  to adjust the BFO freqs.  They need to be adjusted a few times to make sure they are
right on.  You might want to call TenTec and talk with Gary also.  He's a great help.

Clayton N4EV

On Monday, April 28, 2014 4:18 PM, Barry N1EU <barry.n1eu at gmail.com> wrote:

Jim, you need to first align your BFO oscillators (where have I heard this
before?).  You need a frequency counter or a well aligned general coverage
receiver with accurate readout that can tune to 9MHz.  The procedure is
described on pages 4-43 and 4-44 of the Omni 6 manual.

73, Barry N1EU

On Mon, Apr 28, 2014 at 7:39 PM, Jim Allen <jim.allen at longhornband.net>wrote:

> OTA testing with W5DV just now has demonstrated that something is goofed up
> in the frequency alignment.  When he transmits at 14.050.00, I must tune
> 14,050.70 to hear him with a 700 hz. tone.  On transceive, when I go back
> to him, he hears nothing, as my transmit frequency is zerobeat on
> 14,050.00.   When I call him on 14,050.00 he hears me, but I don't hear
> him, because I am zero beat with his signal.  I dialed in -.70 of XIT and
> we hear each other as expected.  I copy him on 14,050.70 and he copies me
> sending on 14,050.00.  That's not how this is supposed to work.
>
> I also notice that adjusting the sidetone frequency doesn't appear to
> change the transmit frequency. It does change the difference between the
> received frequency where the beat note is zero'd with the sidetone, which
> amounts to the same thing, I guess.
>
> I also checked out both VFO A and B and they are the same.
>
> This radio was at TenTec in March and thoroughly checked out.
>
> Is this frequency alignment easy, or require special test equipment, etc?
>
> 73 de W6OGC  Jim Allen
>
>
> On Mon, Apr 28, 2014 at 1:41 PM, Jim Allen <jim.allen at longhornband.net
> >wrote:
>
> > I spoke to Paul at Tentec this morning.  He suggested I use the 706 to
> > transmit and see if I hear that signal in the Omni.  So, with the 706
> tuned
> > to 14,050.00, on low power and dummy load, I copy with 706 on the Omni at
> > 14,050.70 with a 700 hz. tone.  It is zero beat at 14,050.00.
> >
> > The 706 has a transmit freq, function which shows it transmitting on
> > 14,050.00.  If I was at another location and transmitting at 14,050.00
> with
> > the 706, and you heard me using this Omni, your VFO would show 14,050.70.
> > When you with the Omni, call me, on transceive, the signal is 14,050.00
> and
> > zero beat, so I don't hear it on the 706.
> >
> > Paul also confirmed that the sidetone setting varies the transmitter
> > offset, hz for hz, so that when you zero the other signal to the same
> tone,
> > the transmitter is zero'd with the other signal.
> >
> > Paul could do no more without the radio on the bench but suggested I
> > eventually may want to do a Master Reset.  I did a partial reset last
> > night, with no discernible change.
> >
> > I'll get on the air later with other stations locally to do some more
> > testing.
> >
> > 73 de W6OGC  Jim Allen
> >
> >
> > On Mon, Apr 28, 2014 at 12:35 PM, <chacuff at cableone.net> wrote:
> >
> >> If that just came back from the factory I would ship it back up to
> >> them...sounds like a simple alignment issue but it should have been
> caught
> >> in final checkout before being shipped.
> >>
> >>
> >>
> >> Without some test gear it will be hard to get it right.
> >>
> >>
> >>
> >> Cecil
> >>
> >> K5DL
> >>
> >>
> >> From: John Swartz
> >> Sent: April 27, 2014 5:05 PM
> >>
> >> To: tentec at contesting.com
> >> Subject: [TenTec] Omni VI mystery
> >>
> >>
> >> I ran an on-air test with Jim and found that when using my Omni VI+,
> >> transmitting on 14.052.50, Jim was receiving me at 14.053.11 on his Omni
> >> 6.  When he transmits, I receive him just fine if I engage the RIT and
> >> listen up 500 Hz, which just about coincides with what his rig is
> >> telling him his transmit frequency is.  So, it seems that when he hears
> >> a CQ and answers it, he is actually about 500 Hz higher in frequency
> >> than the guy he is hearing.
> >> I hope this helps diagnose his problem.  I'm not savvy enough to know
> >> the fix, other than temporarily engage the RIT or XIT and preset that
> >> 500 Hz difference.
> >>
> >> 73,  John WA9AQN
> >>
> >> --
> >> John Swartz
> >> Amateur Radio WA9AQN
> >> 15076 New Salem Bluff Road
> >> Petersburg, IL 62675
> >> USA
> >> tel 217-632-5925
> >>
> >> _______________________________________________
> >> TenTec mailing list
> >> TenTec at contesting.com
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> >>
> >
> >
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