[time-nuts] FE 5680A Warning

EWKehren at aol.com EWKehren at aol.com
Sat Nov 12 13:07:28 EST 2011


I have done some more checking and identified the C field pins: one has  
2.5163 V, the other 2.5294 V. Would be nice to know which one gets varied in  
units with C coil adjustment. Xtal Osc. is 60 MHz on this unit. Also has an 
AD  9832 in it, unit is specked at 25 MHz so it does not run off the 60 MHz.
Bert Kehren
 
 
In a message dated 11/12/2011 12:46:36 P.M. Eastern Standard Time,  
djl at montana.com writes:

I just  bought a couple of 5680A's that have the same FEI p/n. They are
pop-riveted  to a heavy double-sided board., obviously cut off from a
longer board. I've  removed one of these from it's board/heatsink. There
are two pots on the  board, only one of them can be trimmed with the case
on. The sinewave  forming filter and maybe countdown chips are not there,
and never were.  There are three identical voltage regulators on the
heatsink spine.
I'll  be doing some more reverse engineering on these units; they were so
cheap I  had to have a couple! If only FEI was more helpful! hey must
have moved on  from these, and could put one manual out there?
Oh  Well!
Don

EWKehren at aol.com
> The FE 5680A's advertised as NEW  are not NEW!  A  friend  that  made me
> aware of  the sale did notice clear signs of use, so I did a  closer
>  inspection
> under a Microscope and found clear indications that the  unit  has been
> bolted down in the past. Does work fine and I am  looking at ways to go
> directly
> to the C field to disciplin the  Rb. Does any one have info that would
> help
> to do so.
>  Bert Kehren  Miami
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-- 
"Neither the voice of authority  nor the weight of reason and argument
are as significant as experiment, for  thence comes quiet to the mind."
R. Bacon
"If you don't know what it is,  don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six  Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX  406-626-4304
www.lightningforensics.com
www.sixmilesystems.com



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