[time-nuts] Ebay FE-5680A Rb: Are they that good?

EWKehren at aol.com EWKehren at aol.com
Thu Dec 8 15:36:57 EST 2011

I bought one just for the heck of it for $40 plus shipping. It was  
advertised as new, (he has changed his listing) but it was not factory new, had  
been installed at one time but no sign of usage. It had also not been  
"tuned"since leaving the factory and it was within 5 E-11 after a day. After  
controlling temperature and looking at 1 E-12 for 10 days I have not detected  
any aging. Tuning is done through the RS232 input in 7E-13 steps. I plan to  
modify mine and use C field control. 
I like what I see, well engineered.
Bert Kehren. 
In a message dated 12/8/2011 2:55:05 P.M. Eastern Standard Time,  
albertson.chris at gmail.com writes:

On Thu,  Dec 8, 2011 at 10:58 AM, Chuck Forsberg WA7KGX N2469R
<caf at omen.com>  wrote:

> FE-5680A Rubidium Atomic Frequency Standard  Oscillator Transceivers 10Mhz
> Out

There was a lot of email  about these a short while ago.  But is is
still not clear to me if  these are even adjustable and if not, how far
have they drifted off of  10Mhz since they were new.    I'd like to buy
one and calibrate  it to a GPS.

Chris Albertson
Redondo Beach,  California

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