[DSP-10] GPS Standard : HPZ3801A or Shera project ?

Tue, 7 May 2002 16:03:56 +0200 (CEST)

Hi,

thanks for reply and information. Yes will be nice if
you will share your 
experience with us.

The only information that I have about the  HP Z3801A
is at
this site : 
http://www.realhamradio.com/GPS_Frequency_Standard.htm

73
Rocco

 --- "3.1415926535897932384626433832795"
<[email protected]> ha scritto: > Hi
Rocco,
> 
> I just ordered a Z3801A from Ebay. They are going
> for $299. I should have it
> tomorrow so I will share my findings. Please let me
> know if you find any
> other information. Here is some information that I
> have:
> 
> "
> 
> The OCXO inside the HP Z3801A  is P/N 10811-60161, a
> variant of the
> ubiquitous 10811. From what I've read the normal 10
> MHz 10811 oscillator has
> a manual tuning range of 2E-6 (20 Hz) and an EFC
> range of 1E-7 (1 Hz).
> 
> From what I've heard, for a GPSDO product, you don't
> need (or don't want, or
> can't have, depending on how you look at it) a
> manual frequency adjust so
> all the adjustment must be done through EFC. This
> EFC adjustment range must
> last the entire *lifetime* of the product, so it
> must be large enough to
> cover the net oscillator drift for something like 10
> or 20 years. Just a
> guess; don't quote me on it.
> 
> My guess is the 10811 inside a Z3801A is as good or
> better than most of the
> OCXO people are using with Brooks' board. The
> 6-channel Oncore inside the
> Z3801A is also as good or better than the GPS
> engines people are using with
> Brooks' board.
> 
> Attached is the performance plot of a running Z3801A
> I'm shipping off this
> week. I have more.
> 
> /tvb"
> ----- Original Message -----
> From: "Rocco Tanucci" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, May 07, 2002 5:08 AM
> Subject: [DSP-10] GPS Standard : HPZ3801A or Shera
> project ?
> 
> 
> > Dear All,
> > I would like to have a GPS frequency standard but
> I'm
> > not sure on
> > Brooks Shera project or  the Hewlett Packard
> Z3801A.
> >
> > The price for Z3801A is 399$ (in the surplus
> market),
> > the price for
> > Shera project is almost the same ( GPS receiver
> 150$,
> > HP oscillator, 150$, etc.)
> >
> > Any suggestion ?
> >
> > Regards.
> > Rocco
> >
> >
>
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> 

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