Re: [TenTec] Omni VI+ TXCO

["Bob McGraw - K4TAX" <RMcGraw@Blomand.net>]

As I recall, having owned 2 different Omni VI Plus radios, the earlier one 
had a crystal oven and the later one had a TXCO.  The advantage of the TXCO, 
it didn't have to come to temperature to be accurate.  While the oven took a 
bit of time to stabilize as it heated, if the DC power was left on the oven 
was up to temperature and stable at the turn-on of the radio.  And typical 
of xtals in ovens, repeated cycling of heat vs. no heat cycles caused more 
aging thus more frequent calibration was needed.
I recall in broadcast transmitters we kept the ovens on all of the time even 
when the transmitter was off.   This assured more long term stability with 
regard to frequency.    Golly.....that's been a long time ago.
73
Bob, K4TAX






----- Original Message ----- 
From: "Ron Notarius W3WN" <wn3vaw@verizon.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Tuesday, November 06, 2012 8:07 PM
Subject: Re: [TenTec] Omni VI+ TXCO


> Thanks Barry.
>
> That's why he asked, because he wasn't sure.
>
> I've passed the Wiki link on to him, so all is good.
>
> And thanks to all who responded.
>
> 73, ron w3wn
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Barry 
> N1EU
> Sent: Tuesday, November 06, 2012 7:04 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Omni VI+ TXCO
>
> Ron, what your friend originally asked is full of mis-information.
>
> What Clayton just posted is essentially true.  According to the wiki,
> the Omni VI and early VI+ used a xtal oven. Ten-Tec switched to a TCXO
> in the later VI+ because the oven was no longer available to them. The
> TCXO was available as a kit to retrofit earlier units with failed
> ovens.  But a proper functioning oven should have had equal or better
> stability than the TCXO, so it really wasn't an "upgrade".
>
> 73,
> Barry N1EU
>
>
>
> On Tue, Nov 6, 2012 at 12:23 AM, Ron Notarius W3WN <wn3vaw@verizon.net>
> wrote:
> > Earlier today, a friend of mine (a US ham currently overseas, but due to
> > return in a few months) asked me this question about the Omni VI+ :
> >
> > "Omni VI+, was the TXCO a standard option or aftermarket? From my 
> > research
> I
> > have found that the Omni VI stared with a TXCO and then moved to a xtal
> oven
> > but that due to better longevity and stability the + went back to the
> TXCO.
> > However, what I can not find is if they were optional or standard."
> >
> > Anyone know the answer?
> >
> > (FWIW, at least at the time I checked this morning, the TenTec Wiki
> appeared
> > to be down, never had a chance to look further, and I have to spend the
> rest
> > of the night working on my club newsletter!)
> >
> > Thanks!
> >
> > 73, ron w3wn
> >
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