[time-nuts] Z3801 Replacement GPS Receiver Card

[paul swed]

I also have a z3801 so perhaps I will face the same issue at some point.
The question I have is the following.
If a uproc is inserted between the rcvr and the chassis to intercept the
init command.
Then respond back with whatever the response might be and then simply pass
through in both direction whatever comes next.
Could an updated rcvr be used.
Is this init command really the only gotcha?
Not trying to do some complete re-emulation. But what I outline above would
not be difficult.
I would use whats called an SXB chip. cheap simple...
Regards
Paul
WB8TSL

On Thu, Sep 13, 2012 at 5:08 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> Are you sure that the GPS unit is defective? Can you test it alone?
>
> On Thu, Sep 13, 2012 at 10:44 PM, Mike S <mikes at flatsurface.com> wrote:
>
> > On 9/13/2012 2:00 PM, Chris Albertson wrote:
> >
> >> On Thu, Sep 13, 2012 at 10:53 AM, Mike S <mikes at flatsurface.com> wrote:
> >>
> >>> Search for "oncore vp" (which is what a z3801a needs), and you won't
> find
> >>> ANY, at any price.
> >>>
> >>>  Really?  It can't use the newer UT?  I thought the UT is identical
> >> except
> >> for better performance.
> >>
> >
> > Yes, really. The z3801a starts by sending a @@Ca (self test) command.
> None
> > of the later models have that, so it fails. When they brought the self
> test
> > back with the M12s, it was changed to @@Ia. Then it sends @@Cg (go to
> > Position fix mode). They don't have that, either, it was changed to @@At
> on
> > the UT/GT/SL, @@Gd on M12s. There are probably others, but that's more
> than
> > enough to make anything later than a VP fail.
> >
> >
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