[time-nuts] Wanted to buy or borrow -- RFTG-m-XO L106A

[John Ackermann N8UR]

I'm not sure what's going on.  I ran my XO/RB pair for 30 days, using
the "official" interconnect cable with the monitoring software
indicating no problems.  I took phase data from the RB output via the
TSC and fed it into Stable32 (by the way, with a 20 second timeout, the
30 day TSC data capture worked fine).

The results show a reasonably constant +1.5 microsecond slope over 30
days, about 6x10e-13 offset.  There's no characteristic cliff in the
ADEV where the GPS kicks in, but yet the offset is better than I would
expect from the LPRO running in standalone mode.  Plots are at
http://www.febo.com/pages/oscillators/rftg/

I then pulled power on the RB unit and instead of going into proper XO
operation, I got "NO GPS" and "FAULT" on the XO.  In separate
experiments, pulling the interface cable or the 10 MHz cable result in
the same faults -- the XO doesn't seem to take over as it should.

And, when I measure the XO output, it is just horrible -- ADEV in the 9s
from 0.1 second out past 10,000 seconds.

I wonder -- has ANYONE gotten the -XO module to work in GPS-disciplined
mode???

John
----
Tom Van Baak said the following on 03/15/2008 03:25 PM:
>> I suspect the XO module in my RFTG setup is defective, so I'd like to
>> find another one.  It needs to be the "L106A" (not "B") version to mate
>> with my -RB (L105A) unit.
>>
>> Anyone have one they'd like to sell?  Or, failing that, one I could
>> borrow to test in my system?
> 
> John,
> 
> Interesting, my RFTG pair won't lock right either; I'm thinking
> my XO module has a problem too. Do you think we're making
> the same mistake or are both of our XO modules faulty?
> 
> /tvb
> 
> 
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