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

[Chris Quayle]

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