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,<[email protected]> 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,
[email protected] 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
[email protected]
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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