[time-nuts] FE 5680A Warning

[Don Latham]

Hi Peter: The external oscillator is just "thrown in" to the deal; they
have nothing to do with the Rb unit. You also get a gratuitous 9 pin
connector. These units should be self-contained.

Don

Peter Gottlieb
> I am not familiar with how these units are set up.  I have a couple of
> older Ball units which simply put out 10 MHz, but these FE ones seem to
> have this external crystal oscillator?  How does that work?  I've seen
> these 5680A's for sale cheap and they come with these external 63 or so
> MHz oscillators, are they needed?  I would like a couple of small Rb osc
> units to put into comm gear but would like them self-contained without
> all sorts of external parts.  Can someone explain what's up with these?
>
> Peter
>
>
> On 11/12/2011 1:13 PM, Pete Lancashire wrote:
>> 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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-- 
"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