[time-nuts] problem with Efratom FRS-C from eBay

hasweb at has.org.nz hasweb at has.org.nz
Fri Oct 17 23:25:56 UTC 2008


Quoting Robert Darlington <rdarlington at gmail.com>:

> Hello all,
>
> My FRS-C showed up today.  I carefully wired it up and powered it on.  I got
> a nearly 10MHz signal out.  The frequency counter is dancing around a bit
> and I get a 0.02 V on the lock indicator line after about an hour warm up.
> Specs show this should happen in under 10 minutes and it looks like it is
> not locking.   Dead unit?
>
> I obtained it from this ad:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290262243079
>
> The unit that I received does not show TTL after the frequency and the scope
> output looks like a cross between a sinewave and a ringing square wave.  I
> have about 13 feet of RG174 between the FRS and the measurement equipment so
> who knows.   This is the "*Rubidium and GPS DO From
> China<http://stores.ebay.com/Rubidium-and-GPS-DO-From-China>"
> *eBay store, which I thought was pretty reputable so I want to make sure I'm
> not doing anything wrong before I contact the seller, PayPal, etc.*  *There
> was also a big white sticker covering the whole top of the unit.  I had to
> remove it to verify the pinouts and the model information.  Hoepfully that
> didn't void my warranty on the $100 paperweight.  Should I let it sit
> overnight?  Any suggestions would greatly be appreciated.
>
> Thanks,
> Bob, N3XKB
Bob

What was the terminating impeadnce at the end of the 13 ft of RG174?
Can you post a picture of the waveform?

Bruce





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