>From a different Bob:
The Omni V and VI and VI Plus have several oscillators that will
eventually affect "being on frequency". The master oscillator for one
and then the BFO oscillators to add to the confusion. If any of these
are off frequency then tuning in a signal will also be questionable.
Worse case, entering a specific frequency by keypad clearly would not be
correct. All of this applied to the Paragon and Paragon II radios as
well.
Later units had the master oscillator in a heated oven or TCXO. If the DC
was applied all the time, even when the radio was off, the oven stayed at
operating temp and thus frequency was stable. If one removed the DC
source then one had to wait until the oven came up to temp for frequency
accuracy. It is then noted the constant heating and cooling of the
crystal in the oven did cause a migration of frequency over time. Hence,
occasional calibration was required.
With the BFO crystals not being in an oven, use of the radios on high
duty cycle modes caused the internal case temperature to rise, causing
the crystal to migrate in frequency and again an "off frequency" report
was noted.
Technology today has moved well away from these methods. The radios are
inherently more stable and frequency readouts are much more accurate such
they actually represent the true receive and transmit frequency.
73
Bob, K4TAX
> Hi Bob,
>
> You stated in your recent post that:
>
> "not many people were aware that you could bring an Omni 5 right on qrq
> using a pot on a circuit board in the rig.
>
> This was the main gripe on a very excellent rig when it was new. Many
> hams got rid of their omni 5s because of this.
>
> I found it and could never get the tentec service guys to point this out!
> It was strange. I think I even talked to the Jack Burchfield one time
> regarding
> this problem"
>
> Bob, can you share what pot and board did you find in the Omni V that
> does this?
>
> As you know, the Omni VI had either a crystal oven or TCXO for master
> frequency reference but the V did not.
>
> I have an Omni V with Carl's V.9 chip in it and you can freeze the
> display and tune the rig for calibration. It is very effective.
>
> I really love the V because of its lack of DSP that,IMO, was not well
> implemented in the VI as it remains in line even when not activated.
>
> Thanks for sharing any info on the V.
>
> 73 de N1LQ-Dave
>
> _______________________________________________
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>
--
Disclosure:
I am a Tentec Ambassador and compensated according to the Tentec
Ambassador plan. I serve as a volunteer beta test person for the Omni
VII, Eagle and Argonaut VI products. Otherwise, I hold no business or
employment interest with Tentec.
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