[time-nuts] Z3801A EFC error

[Said Jackson]

I found the gt74 gps to be lacking in performance in my Z3815. Sorry, no data sheet for it.

I simply cut the 1pps output cable, and spliced a ublox receiver 1pps output into it. Then I split the antenna feed to both gps and found 3.3V somewhere for the ublox gps.

Works like a charm, z3815 firmware is happy talking to the Furuno, but timing and sensitivity is much better now from the ublox.. Even with a navigation receiver. Sorry, don't remember what pins where 1pps or power, but that's easy to find with a multimeter.

Btw: the Z3815 output is very noisy for some reason. Hp did not do a good job on utilizing the E1938 performance here...

Said




On Jan 8, 2012, at 11:22, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 01/02/2012 09:28 PM, Azelio Boriani wrote:
>> On the usual paybay site there are available some Z3815 with the E1938
>> oscillator. I have bought one and found the shielding of the Furuno GT74
>> GPS heavily rusted. Fortunately it is perfectly working and the seller says
>> all are that way. It was the only item found with that type of OCXO.
> 
> I have found very little information on the Furuno GT74 receiver. Anyone having the usal manual stuff for it?
> 
> Cheers,
> Magnus
> 
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