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

Javier Herrero jherrero at hvsistemas.es
Thu Dec 8 15:10:25 EST 2011


I've got mine a few days ago, had not too much time to play around but 
seems to work ok. As received, it locked quite fast and it seems to be 
around 10e-9 off compared with my Thunderbolt. Not tried to adjust it 
yet. Also, it seems to put a quite clean sine output. Second harmonic 
around -60dBc (from memory... can be -50dBc), and close up spurs -70dBc 
at +/-200kHz, and somewhat lower at +/-400kHz. I have not yet looked to 
closer spurii (only to what was apparent at 10kHz RBW).

Next step, to calibrate to GPS and look the output with more detail :)

It seems it can be adjusted through the serial port, but it is 10MHz 
fixed (not 1Hz - 20MHz as other FE-5680A). Well, not bad for the price :)



El 08/12/2011 20:53, Chris Albertson escribió:
> 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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