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

John Ackermann N8UR jra at febo.com
Mon Mar 17 12:42:43 UTC 2008


That's a good hint.  Thanks!

John
----

Scott Mace said the following on 03/16/2008 09:31 PM:
> 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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> 
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