[time-nuts] Z3805A & GPS replacement

[Bob Camp]

Hi

I think you will find that the Z3805 uses Motorola protocol to communicate with the GPS. If you do not have the "right" Motorola GPS the firmware in the Z3805 will not work.

Bob

On Feb 6, 2013, at 3:20 AM, Pierre-François (f5bqp_pfm) <pfmonet at wanadoo.fr> wrote:

> Hi the Timing-Gang,
> 
> I got very recently a Z3805A GPSDO six channels coming from China from one of the most serious Chinese shop on The Bay ... :-D :-D :-D
> It's a six channels GPS unit and I would like to upgrade it by myself with a 12 channels using a Jupiter GPS module or Motorola ones I believe 12 channels and I have on hands.
> I've tried to replace the original GPS module with the Jupiter, the unit boots up and after a minute I got an alarm (red led on continuously).
> So my interrogation is the following:
> Does the alarm arrives because the firmware checks the type of GPS module?
> Does the alarm arrives because the Jupiter doesn't talk the Motorola bin language? (if I remember the Jupiter can be set in the two modes Motorola or NMEA talk).
> Any other reason concerning this alarm?
> If the firmware is different for each type of GPS module then can someone here in the Gang tried to replace the GPS successfully modifying or replacing this firmware?
> I really would like to have more than the six basic channels as I have several GPS modules with more channels.
> 
> Also does anyone of you have the Z3805A manual? I'm searching for it.
> 
> Bests 73's to all of you.
> 
> -- 
> Pierre-Francois, F5BQP
> 
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