[TenTec] Some Observations on Orion Stability/Calibration

[Gary Hoffman]

.... and of course, what I missed was... the little matter of transmitting
into those diodes !!   oops...  :)

73 de Gary, AA2IZ



----- Original Message ----- 
From: "Gary Hoffman" <ghoffman at spacetech.com>
To: <tentec at contesting.com>
Sent: Wednesday, June 04, 2003 4:54 PM
Subject: Re: [TenTec] Some Observations on Orion Stability/Calibration


> 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 at dimensional.com>
> To: <tentec at 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 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
> > > > http://lists.contesting.com/mailman/listinfo/tentec
> > > >
> > >
> > >_______________________________________________
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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
> >
> > _______________________________________________
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>
>
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