[TenTec] Omni VI mystery

Mon Apr 28 15:54:32 EDT 2014

Page 4-43 is the power amp schematic and 4-44 is the FM board description
in my manual.  I haven't seen anything that looks like BFO alignment.

I have a Funcube Pro Plus that receives anywhere, although I am not certain
of its alignment.

73 de W6OGC

On Mon, Apr 28, 2014 at 2:50 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
> > >>
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> > >>
> > >
> > >
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