Appropros of that (protecting the input with a pair of diodes), wouldn't it
be a good idea to protect our regular antenna connection in that exact same
manner ? Sounds too simple, so I must be missing something.
73 de Gary, AA2IZ
----- Original Message -----
From: "Eric F. Richards" <efricha@dimensional.com>
To: <tentec@contesting.com>
Sent: Wednesday, June 04, 2003 3:18 PM
Subject: Re: [TenTec] Some Observations on Orion Stability/Calibration
> 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@verizon.net>
> >To: <tentec@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
> > >
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> > >
> >
> >_______________________________________________
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>
> --
> Eric F. Richards
> efricha@dimensional.com
> "The weird part is that I can feel productive even when I'm doomed."
> - Dilbert
>
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