[time-nuts] FE 5680A Warning

[Pete Lancashire]

They are tempting

-pete (looking at bank account)

On Sat, Nov 12, 2011 at 10:07 AM,  <EWKehren at aol.com> wrote:
> 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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