[DSP-10] GPS Standards

[refmon]

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" <boblark@proaxis.com>
To: <dsp-10@mailman.qth.net>
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
> >_________
> >
> >
> >
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> >
> >
>
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