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

[Scott Mace]

I have experimented with several of the RFG units and found that
the XOs will not clear the fault light if the OCXO has drifted
too far.  I was able to manually trim them and they worked well
again.  Perhaps a similar problem with your RFTG.


	Scott

John Ackermann N8UR wrote:
> 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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> 
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