[TenTec] Omni VI off frequency

[Ken]

My Omni 6+ has a failed oven in the reference oscillator and I am very 
interested in replacing the item.  If anyone has successfully done this 
mod, I would appreciate any advice or guidance.  What specific 
oscillator did you use and where did you purchase it. I'm not interested 
in "plowing new ground" or making a science project out of this.  I just 
want to get my Omni 6+ back up to good health.  Thanks...

Ken,  K9PGC



On 2/24/2017 11:43 AM, John Callari wrote:
> Thanks for the suggestions and information...
>
> I have to figure out if I have the time to tear her down a bit and change
> the 20 MHz reference oscillator, then tune each band crystal to see if it
> comes back into range.
>
> Does anyone have a diagram that shows the layout on the board for the band
> crystals?  The drawings in the manual don't show which adjustment
> point/crystal is for which band.
>
> Thanks!
>
> John
> K2JNC
>
>
> On Fri, Feb 24, 2017 at 9:44 AM, Dukes HiFi <dukeshifi at comcast.net> wrote:
>
>> I do not consider Omni 6 radios at EOL.
>>
>> They are usually easy to fix and great performers aside from their raucous
>> sounding SSB receive audio.
>>
>> Do you power your power supply off when you turn off your radio?
>>
>> If so, you are allowing the oven to cool and there will be a significant
>> wait time for stabilization anyway even if the over is still working at
>> all. Failure of the reference crystal oven is quite common in the older
>> Omni 6 radios. That is why Ten Tec changed to a prepackaged 20 MHz
>> reference oscillator in later versions. These fail too.
>>
>> Since you have SO many bad positions, it is unlikely that your problem
>> rests only with bad crystals anyway. More likely the reference is off
>> frequency snd is drifting.
>>
>> Several have suggested in previous posts that you can install one of the
>> many prepackaged thermally compensated crystal oscillators available from
>> Mouser or Digikey as the reference. The frequency is 20 MHz. This is a very
>> good suggestion.
>>
>> These devices were not available when the Omni 6 was first designed.
>> Installation is very easy and the end result is better than the original.
>>
>> You will need to realign the crystals that are still within range but some
>> may need replacement. These can be had either f rom junk radios or from a
>> few on line crystal suppliers.
>>
>> Once you follow the alignment instructions for one band that seems to
>> align up properly, follow through with the others and see how many of them
>> pull in. Chances are that most will once the reference oscillator problem
>> is corrected.
>>
>> Gary
>>
>> W0DVN
>>
>>> On Feb 23, 2017, at 4:58 PM, John Callari <john.callari at gmail.com>
>> wrote:
>>> Hello all..
>>>
>>> I recently acquired an Omni VI...  After warming up, some bands are dead
>> on
>>> (17M, 15M), some are off a little bit (40M, 80M) about 500 Hz and 20M is
>>> off by nearly 1.5 kHz.
>>>
>>> I've worked on some of my older Icom rigs (751, 745, 765) and was able to
>>> re-calibrate them and re-align...  but that was following the service
>>> manuals...
>>>
>>> Any suggestions on the best way to fix this...  From what I've read and
>>> looking at the manual, I'm guessing that my problem is with the band
>>> crystals on the XTAL OSC/ LO board...
>>>
>>> Any help would be much appreciated.
>>>
>>> Thanks!
>>>
>>> John
>>> K2JNC
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