[DSP-10] GPS Standards Z3801A ETC

Thu, 9 May 2002 22:53:09 -0400

I believe the 19.6608 is used for CDMA (IS-95). For those interested here
are some pictures of the Z3801A and an Allan Deviation plot of a typical
Z3801A unit. I received my unit and decided to go get another one. I think
these are a steal for $299 from ebay. They have an HP10811 inside.

http://ozoni.com/n4ip/z3801A1.jpg

http://ozoni.com/n4ip/z3801A2.jpg

http://ozoni.com/n4ip/log7822v.gif

----- Original Message -----
From: "refmon" <[email protected]>
To: <[email protected]>
Sent: Thursday, May 09, 2002 9:58 PM
Subject: Re: [DSP-10] GPS Standards

> Hi,
>
> Quick response...took a look with HP 8568B spectrum analyzer and also
tuned
> a monitor port for 19.6608 MHz (more sensitive HF receiver for that one)
and
> didn't find any sign of leakage...I have, however, capped the 19.6608 MHz
> outputs with 50 ohm SMA terminators, now that you mention it.
>
> By the way, does anyone know what the 19.6608 MHz might have been used
for?
> These are ex-cell site items, so maybe it's a run-of-the-mill reference
I'm
> just unaware of.
>
> regards
>
> John
> _________________________
> ----- Original Message -----
> From: "Bob Larkin" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, May 07, 2002 08:24 PM
> Subject: Re: [DSP-10] GPS Standards
>
>
> > Hello,
> >
> > I just noticed in John's post that there are 19.6608 MHz outputs from
the
> > Z3816A. This frequency is at the lower edge of the 1st I-F passband. The
> way
> > the second I-F frequencies are arranged, this will never hit in a
passband
> > for SSB, CW etc. But it is inside the FM passband.
> >
> > Does anyone have an Z3816A hooked up? (or does the Z3801A also have this
> > signal?) If so is there any problem with a 19.6608 signal sneaking in,
> along
> > with the 10 MHz reference? If it is there, it would appear as an FM
signal
> > that is there with the external reference, but not with the internal
> crystal.
> >
> > 73, Bob
> >
> > At 03:30 PM 5/7/02 -0700, you wrote:
> > >Hi,
> > >
> > >I'm relatively new to the list and have yet to build one of the DSP-10
> kits,
> > >but have been following the GPS thread with interest.  Probably not a
> huge
> > >revelation, but also available on ebay is the HP Z3816A, which I have
> found
> > >more directly convenient than the Z3801A...note that all the software
> runs
> > >on both units.  The Z3816A requires a 24/28VDC supply (perhaps more
> likely
> > >to be lying around the shack/lab) and also has qty 2 10MHz outputs, qty
4
> > >1PPS outputs, and qty 4 19.6608 MHz outputs.  Also the Z3816A has
RS-232
> as
> > >standard...the port must be initialized before running SatStat.  Ebay
> prices
> > >have been varying between $400 to $550 based on demand, although at
least
> > >one source appears to be getting, shall we say, over-confident, and has
> > >jacked the min bid to $500.00.
> > >
> > >In any case, all discussion I've seen on the list applies to the 3816A.
> My
> > >application thus far is pretty direct:  I use a single 1PPS to drive
> station
> > >clock/IRIG-B timecode generator AND both 10MHz outputs to act as lab
> > >reference for about 36 items...my 10 MHz reference system consists of
two
> > >species of distribution... I feed one 10MHz output to an ANZAC AM-109
> > >amplifier and then split it by 2, then 6 each (total 12 items) using
all
> > >ebay-acquired splitters, amps, and cables.  The other 10 MHz output is
> > >distributed via surplus Grass Valley broadcast video distribution
> amplifiers
> > >modified slightly for 50 ohm (vs original 75 ohm) operation.
> > >
> > >Both versions of distribution seem to work fine and every piece of
> > >referenced gear exceeds its stock performance on its own internal
> > >oscillator.  Should the GPS fail, an HP 8568B or similar test equipment
> can
> > >be patched in to provide an almost-equivalent signal.
> > >
> > >thanks, and keep up the great discussions
> > >
> > >John Collins
> > >_________
> > >
> > >
> > >
> > >_______________________________________________
> > >DSP-10 mailing list
> > >[email protected]
> > >http://mailman.qth.net/mailman/listinfo/dsp-10
> > >
> > >
> >
> > _______________________________________________
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> >
> >
>
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