[time-nuts] Re: Subject: Rapco 3804A Time Code Generator

[Bob kb8tq]

Hi

A lot depends on just *what* the error actually is that’s popping up on the Rb. In some 
cases you have a VCXO that locks up to the Rb signal . The VCXO ages “far enough” to
cause problems. Adjusting it can help in this case. You need to do some digging to see
if your specific make / model / date code has this issue. 

If it is a lamp, some have had luck pulling the lamp out of various Rb’s and blasting it
with a hot air gun. This sort of thing is not for the faint of heart. 

Indeed Rb’s do come up for sale on eBay from time to time. Replacing the whole unit
might be an alternative.

Bob

> On Aug 22, 2021, at 5:25 AM, Roy Phillips via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Fellow Time -Nuts
> I have obtained a Rapco 3804 time Code Generator , all in a 1U housing, which was in basic working order, except it had a Lassen SK2 GPS Rx which was suffering from the ‘roll-over’ problem, otherwise working. I obtained a direct replacement for the GPS Rx unit from the Heol Design company in France,  which works perfectly . The Rapco unit also has  a small Rubidium Standard ( Swiss manufacture), which frequently reports  'a fault’ , this I guess is a failing lamp. I have noticed that our good friend Magnus seems to be conversant with these Swiss rubidium units, and I wonder if he could offer any advice , as to correcting this problem. The unit has a good and comprehensive display (when you have ‘discovered’ the button pushing sequence !) .  This brings me to ask if anybody has a manual, or any data on this unit, as I have not been able to find anything to date . Thank you for any help
> Roy Phillips
> 
> 
> Sent from Mail for Windows
> 
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