[TenTec] Omni VI warm up gremlin

[Steve Halliburton]

There are lots of sources, like International Crystal and others.  I got mine
from Ten Tec as a spare part for the VI+.  I've never owned a V so I don't
know what the base frequency is.  On my VI/3 the difference was night and
day.

..Steve

--- "Ron Zond" <k3miy at csonline.net> wrote:
> Steve
> 
> Where did you get the TCXO? Would it help an Omni V?
> 
> Ron
> K3MIY
> 
> -----Original Message-----
> From: tentec-bounces at contesting.com
> [mailto:tentec-bounces at contesting.com]On Behalf Of Steve Halliburton
> Sent: Sunday, August 02, 2009 1:19 PM
> To: tentec at contesting.com>
> Subject: Re: [TenTec] Omni VI warm up gremlin
> 
> 
> It depends a bit on what you mean by "cold start".  If you do as the manual
> suggests and leave the power supply on, the oven stays on and the frequency
> should be pretty stable.   If you also turn off the power supply, it takes
> quite a while for the master oscillator to get stable.  Also the trimmer
> gets
> flaky when it get older and does funny things as it warms up.  There is an
> easy (but almost $100) fix to this.
> 
> I replaced the aging OCXO in my VI/3 with a new TCXO and it became much
> more stable. It was also very much easier to get it calibrated; the
> trimmer on the old OCXO was very touchy.  The TT instructions are OK but
> have you leaving the power connected to the old oven even though it is no
> longer used.  I'd suggest also disconnecting that since it just sucks up
> power and generates heat.
> 
> The TCXO is a big improvement.
> 
> 73
> Steve WA2SOC
> 
> 
> --- w5ot at aol.com wrote:
> > My Omni VI, opt.3 has an apparent frquency instability which occurs
during
> > the ten minute period between 5 and 15 minutes after cold start.? Voice
> and
> > CW signals "warble" on both transmit and receive.? Sounds a bit like
> FMing.
> >
> > Any suggestions?
> >
> > tnx es 73 de John, K5SEE
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