[TenTec] KO7I,,

[Barry N1EU]

Pete, could you possibly document your eBay TXCO conversion for the Omni
6?  I'd like to add it to the tentecwiki for the benefit of others in the
future.

Thanks & 73,
Barry N1EU

On Tue, Apr 21, 2015 at 1:33 AM, Peter Bertini <radioconnection at gmail.com>
wrote:

> *These days if the temperature compensated reference oscillator fails, Ten
> Tec cannot repair it, they will offer to hang an outboard
> referenceoscillator on the back of the OMNI 6. To me that sucks. I have no
> idea when the 6+ went out of production, but I do know that my 6 option 1
> is 20 yrs old (or more). As far as for the Omni 6 opt 1 holding up in a 6A
> multi-multi field day deployment, it is a dependable war horse that I can
> rely upon. I am sold on the INRAD roofing filter mod. Quit frankly, if I
> had the KXPA100 100W amplifier to compliment my KX3, I would move my Omni 6
> opt 1 down the road in a heart beat. Side by Side there is a noticeable
> difference in favor of the KX3. N3UT recommended taking a look at the
> numbers of the OMNI 6 on theSherwood Engineering web site. The numbers for
> the KX3 are listed there too.*
>
> *VR, KO7i*
>
>
>
>
>
>
> The ovenized 20 MHz crystal shouldn't be a big deal.  TenTec is supplying a
> common DIP packaged 20 MHz TXCO that is good for 2 ppm stability and runs
> on the 5 volt Vcc bus.  I installed one of their TXCO boards next to the
> CPU board in my  Omni VI plus--it is tiny. Interfacing requires hooking one
> coax jumper and a lead to Vcc, and removing a resistor.  Unfortunately, the
> last quoted price as of a month or so back was $150.00!   I was able to
> find one unused for about 1/2 of that price.
>
> But.... 5 Volt TTL level TXCO DIP modules for 20.000 MHz often show up on
> eBay for dirt cheap prices. I bought several for a few bucks, and did my
> own conversion on my Omni VI, which was drifting badly.   Someone could
> come up with a good replacement for a lot less than the current factory
> pricing. The TTL 20 Mhz goes to the CLK pin on the CPU. and also drives the
> 7474 flip/flop for the 10 MHz clock.
>
> A deal breaker would be losing one of the eproms!  You'd have to find
> someone who could burn a good copy for you, and the revision levels for
> both proms would have to match!
>
> Pete
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