[TenTec] Some Observations on Orion Stability/Calibration

[Eric F. Richards]

At 02:58 PM 6/4/2003 -0400, you wrote:
>Jim,
>
>When I was first hooking up my RX340, I accidentally plugged my HF antenna
>into the external reference input. The front panel LED actually lit
>indicating that the RX340 had detected a 10 MHz reference signal (probably
>WWV) on that input. Since you are so close to WWVH, why don't you try
>hooking up a 10 MHz antenna (as close as you are, maybe just the proverbial
>'wet noodle') to your RX340 reference input and see what happens?

That certainly qualifies as an interesting idea, *but*:

You might want to put a pair of 1v zener diodes (or any diode that'll
conduct at approx 1 v) across the input, and you want to put a pair of
tuned circuits -- one before the diodes, one after -- to keep your signal
restricted to 10 MHz.

You can use multiple frequencies as references -- see your manual.  Likewise,
the standard input can only accept up to 1v p-p as input.

Nonetheless, using WWVH is really a creative idea.  I'd like to see you
run with that one!

(On the tuned circuits:  The receiver itself will only accept a standard
that is very very close to the internal reference -- if it drifts off, it'll
be rejected.  So you aren't substituting an LC tank for your TCXO...)

Eric



>73,
>Mark
>
>P.S. You make the decision. I'm not going to pay to repair your RX340 if it
>blows up <g>.
>
>----- Original Message -----
>From: "Jim Reid" <jimr.reid at verizon.net>
>To: <tentec at contesting.com>
>Sent: Wednesday, June 04, 2003 13:56 PM
>Subject: Re: [TenTec] Some Observations on Orion Stability/Calibration
>
>
> >
> >
> > > This has given me some ideas for synchronizing signals
> > > around the shack,  including the use as an ultra-high stability
> > > reference for my RX-340....
> > > I just ordered the set from www.buylegacy.com
> >
> > Hmmm,  well I am tempted,  but....
> >
> > I live maybe 11 miles East of the WWVH antenna farm
> > here on Kauai.  I suspect the  ground wave signals I rcv
> > from them here have pretty good time accuracy,  hi.
> >
> > They are available at 2.5 (an omni antenna), 5, 10, and
> > 15 MHz from VH.  How many nanoseconds per mile at
> > light speed?  Doppler shift on ground wave?
> >
> > Is there a real point in my also ordering a GPS time standard?
> > Or,  should I spend the $350 to be sure?
> >
> > 73,  Jim  KH7M
> >
> >
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> > TenTec at contesting.com
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> >
>
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--
Eric F. Richards
efricha at dimensional.com
"The weird part is that I can feel productive even when I'm doomed."
  - Dilbert