[time-nuts] Rapco 1804M manual and Control Mode Access ?

[Bob kb8tq]

Hi

Normally a date roll over bug is a non-fixable item in these older
devices. The basic GPS modules simply did not start to have the
“smarts” to handle this until at least a decade after they went out
of production. 

Simple answer is to leave it as is and just use the frequency output. 
If you need time, get a $10 USB GPS “stick” …. way cheaper than 
hacking a working device.

Bob

> On Oct 26, 2020, at 11:45 AM, Chris Quayle <syseng at gfsys.co.uk> wrote:
> 
> Hi,
> 
> Looking for the user manual for the above gpsdo. At power
> up, keeps repeating gps status and time, whereas there
> is an internal control mode for setup. Works fine and
> locks to gps, but the year is stuck at 2001, suggesting
> a date rollover bug.
> 
> Internal GPS engine a a (Trimble ?) TNL22880 and a manual
> for that would be a help. If the bug is not fixable,
> perhaps a later trimble gps engine could be substituted,
> as the protocol may be common.
> 
> This is a 5MHz unit with pps, and useful around the
> lab as a reference for some older test gear...
> 
> Regards & Thanks,
> 
> Chris
> 
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