[time-nuts] FE-5680A Results so far

Chuck Forsberg WA7KGX N2469R caf at omen.com
Thu Dec 29 14:05:09 EST 2011


I gave my 5680a several firm whacks with a backscratcher and it did not 
seem to flinch.
On the other hand I've used taps with a jeweler's screwdriver to fine 
tune my counter's timebase.

On 12/29/2011 10:37 AM, Said Jackson wrote:
> Hello Mike,
>
> We measured a couple of these 5680As on a tsc5125a analyzer. With different quality supplies.
>
> Very noisy buggers, huge number of spurs and very high noise floor -130dBc or so if I recall correctly. Thats probably the jitter you are seeing. Probably due to the dds generating the output not a crystal.
>
> ADEV was parts in E-011 while good, not very good.
>
> Frequency accuracy was +5E-010 then tap the box hard and it goes to -1ppb.
>
> Good enough as a portable frequency counter reference, as the offset can be compensated, and the output is fairly stable...
>
> These units could really use gps disciplining and a crystal post filter.
>
> Great stuff for $40, new they must have been over $1000.
>
> Bye,
> Said
>
>
>
>
>
>
>
>
>
> On Dec 29, 2011, at 1:14, mike cook<michael.cook at sfr.fr>  wrote:
>
>> Hi,
>> Just got my cheapo 5680A.  It was accompanied by a little teddy bear clutching a L7805CV !
>>
>> Got a couple of questions.
>>
>> 1) What is the expected 10MHz peak to peak voltage.  FEI doc seems to indicate 0,5V but I am getting only 200mv.
>> 2) What is the sensitivity to 15V input level. I am only measuring 14,722 (stable) on Pin1.
>> 3) Could this low input voltage affect output voltage?
>>
>> The box locks after a couple of minutes but my TDS 210 is showing a very jittery  ( 9,98-10,02 MHz ) but well formed sine wave for 8 hours of being powered on.  Could this also be an artefact of low main power?
>>
>> rega
>> Mike
>>
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-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430

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