To all & Duane, Denny & company.
After reading Denny's reply, I took a closer look at my Omni VI+. Using
a HP generator for carrier, I measured audio output from the external
speaker jack using a HP Distortion analyzer. This method measured
THD+N. The DSP processed signal has less THD and with less residual
noise than with DSP off. This is exactly opposite of what Denny
describes. Perhaps an external noise which is perodic rather than the
internal noise being random might make a difference in how the DSP
handles the signal thus a difference in distortion may result.
The radio is 2+ years old, exhibits a freq error of less than 30 Hz
after warmup of 10 min or more and has never had the covers off. At a
turn on cold condition, the radio will have a net error of 120 to 150 Hz
while the display shows no error. This error quickly comes within 50 Hz
within 2 min or less. I consider this typical. I do not keep the
external PSU on thus the warm up drift is expected as the time base
comes up to temp. The actual error will be slightly differenct from band
to band, but in no case is it greater than 50 Hz at present. I'll not
tweek the oscillators for this small error.
For reference: S/n 12A10507 purchased 3/18/98
73
Bob K4TAX
k8do wrote:
>
> I have the same rig, and, like you, I seldom do phone preferring CW,
> mostly... I prefer my audio without the DSP which adds slight distortion...
>
> But, having said that Duane, my immediate thought when you stated that the
> DSP "degrades" the SSB audio makes me wonder if your shift control is
> correctly adjusted (internally) when in the 12 o'clock position? And,
> whether you need a fresh alignment from the factory? This is my fourth Omni
> VI series box (a plain Jane VI, a series two upgrade, and two factory VI+)
> and among the things I have learned is that the internal oscillators drift
> with aging... If your rig is over a year old, you may want to consider a
> factory realignment to get the signal stream back into the centers of the
> filters/dsp... It may make a marked difference in the functioning of your
> audio dsp (NR) on SSB... Also, most of the species will have a 40 to 80
> cycle error in the frequency readout within 3 months from being new
> (component aging) and will benefit from a factory tweak...
>
> Denny - K8DO
>
> ----- Original Message -----
> From: "dbudd" <w5ben@arrl.net>
> To: <tentec@contesting.com>
> Sent: Monday, December 18, 2000 8:14 AM
> Subject: RE: [TenTec] 3rd Party Omni-6 Firmware?
>
> >
> > Bob, K4TAX, said:
> >
> > "I use the NR function most of
> > if not all of the time on SSB."
> >
> > Interesting. In my Omni VI +3 the NR degrades the audio in
> > SSB (not that I work SSB all that much!). I usually turn it
> > off. I use it nearly all the time with the digital modes,
> > which I work almost exclusively.
> >
> >
> > Duane Budd
> > w5ben@arrl.net
> >
> > -----Original Message-----
> > From: owner-tentec@contesting.com
> > [mailto:owner-tentec@contesting.com]On
> > Behalf Of Bob & Linda McGraw K4TAX
> > Sent: Monday, December 18, 2000 10:05 AM
> > To: Eric Rosenberg
> > Cc: tentec@contesting.com
> > Subject: Re: [TenTec] 3rd Party Omni-6 Firmware?
> >
> >
> >
> > Eric and all:
> >
> > While I've read the other comments and etc., I'd like to see
> > the NR
> > function remain in memory as other modes. I use the NR
> > function most of
> > if not all of the time on SSB. When the radio is turned off
> > and then
> > turned back on, all other modes and functions remain as I
> > left
> > them........ except for the NR function.
> >
> > 73
> > Bob K4TAX
> >
> > Eric Rosenberg wrote:
> > >
> > > While I thoroughly enjoy my Omni-6 Plus, there are some
> > missing
> > > features in the firmware that would make it even better.
> > While I
> > > haven't spoken with them on the subject, it appears that
> > Ten Tec
> > > doesn't seem inclined to make any changes.
> > >
> > > Has anyone considered re-working the firmware a la Jack
> > Ghiel for the
> > > Omni-6 Plus?
> > >
> > > The two features I would like to see added: visual
> > indication of
> > > transmitting (Ghiel added a "star" on the display), and
> > the ability to
> > > key the radio on the interface (RS-232) line.
> > >
> > > Anyone else interested? What would it take to convince TT
> > to add these
> > > features?
> > >
> > > Comments?
> > >
> > > Eric W3DQ
> > > Washington, DC
> > >
> > > --
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> >
> >
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> >
> >
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> >
>
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