[time-nuts] FRK-L Rubidium

[Bob Camp]

Hi

First thing to check is indeed the frequency of the 10 MHz oscillator. There's a good chance it's simply aged far enough that it will no longer lock up. If the drift isn't super far, the oscillator can be adjusted. The TBolt and a good counter will tell you everything you need to know about the 10 MHz.

If the oscillator is sweeping past the correct frequency, the next thing to check is the output of the SRD assembly. Your scope should be able to "see" that signal. If it's missing, then track it back down the multiplier chain. 

Bob

On Feb 8, 2013, at 7:12 PM, Garren Davis <garren.davis at qlogic.com> wrote:

> 
> Been lurking on the list for a while and finally started playing with a FRK-L  rubidium frequency standard. I've had
> this thing for a while and decided to power it up and see what it would do. I do not get a lock. What I see is the
> lamp voltage at 8.54 volts which I think is good but the xtal control voltage swings from 2 volts to 15 volts and back
> to 2 volts and keeps cycling like that. I don't have a good frequency counter but I have a 3 Ghz 40 G/sample scope
> and it shows that the 10 MHz signal is there. I just don't know how accurate it is. Has anyone seen a problem like
> this? Can anyone point me to a place to start debugging this? I have the schematics and test tools. I am a test
> engineer so I'm not afraid to poke around in the guts of this thing. Hopefully I can get this thing running. I also
> have a thunderbolt that I'll get running this weekend. I don't know how deep I'll get into this time-nuts thing but
> I have this nice scope and a Wavecrest sitting in my garage and I'd like to put them to use. Any help would be appreciated.
> 
> Garren
> 
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