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

[Björn]

I would assume it is TSIP and not NMEA involved here.

Ulf, I have one and probably another working unit. Would you have use for a working unit to compare with? Rapco branded.  You based at the salty front side of Svedala?

/Björn 


Sent from my Phone

> On 3 Jun 2023, at 00:22, paul swed via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 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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