[time-nuts] Re: Regarding RAPCO 2804 (Pendulum 2804)...

[paul swed]

Ulf
A consideration. When a ublox starts up the communications parameters
contain the Ublox messages not just NEMA.
Also the baud rate and parity and bit length may be wrong. You should be
able to sniff the old low sensitivity receiver to see what messages its
putting out and the other parameters and then try matching.
Good luck looks like a neat restoration.
Regards
Paul
WB8TSL

On Fri, Jun 2, 2023 at 4:17 PM Ulf Kylenfall via time-nuts <
time-nuts at lists.febo.com> wrote:

>
> A big thank you for providing the manual !
> I began troubleshooting a few days ago. The OCXO is OK.The GPS module
> (Trimble 52830) seems to have low sensitivity asit can detect only a one or
> two satellites. I tried replacing it with a uBlox unitwith an identical
> footprint but the communication parametersdoes not match which stopped any
> further attempts so I put
> the clock aside but with the manual, I can now proceed.
> The indicated fault was "Erroneous lock +/- 5Hz".
>
> -5 Hz is when the DAC is at 0.2V output. It is a paralell loaded AD7846
>
> V e r y expenceive from distributors but several are availableon eBay at
> acceptable prices. I have to rule out the GPS modulebefore any further
> decisions.
> Once again: Thanks!
> Best Regards
> Ulf Kylenfall
>
>
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