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From: Peter Bell bell.pe...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, Nov 13, 2011 18:32:26 GMT+00:00
Subject: Re: [time-nuts] FE 5680A Warning
The ones with the 2 labels have a date code as the 4 digit prefix on
the S/N - so
Hi All,
Just a few words on the different types of FE5680.
The types requiring 5v on one of the pins only have a simple L C filter
to sine up the square wave and are only suitable for locking digital
devices. The variants with the SMA or single 15v supply have a multipole
band pass filter
I can let you know what I've found out about these units - I got given
a couple of dead ones and did a bit of poking around trying to get
them working. I didn't get that far, since one of the units was
easily fixed (the MAX882 3.3V regulator had failed) and the other
seems to have a faulty Rb
.
Robert G8RPI.
From: Rex r...@sonic.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, 12 November 2011, 21:58
Subject: Re: [time-nuts] FE 5680A Warning
On 11/12/2011 9:46 AM, Don Latham wrote:
I just bought a couple
Pete
Thank you for your information. I agree with your findings and as I pointed
out previously it support the math that the AD 9832 is used for tuning.
That allows them to set the Rb at the optimum operating point based on their
gas mixture. What I like to know is how they control the C
Paul
it is listing # 250911887702 from ggg*fitting. I think we will see prices
dropping even more since there are only so many time-nuts.
Bert Kehren
In a message dated 11/12/2011 10:14:18 P.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Kind of joining in late.
Might this be the
On 11/13/2011 10:36 AM, Peter Bell wrote:
I can let you know what I've found out about these units - I got given
a couple of dead ones and did a bit of poking around trying to get
them working. I didn't get that far, since one of the units was
easily fixed (the MAX882 3.3V regulator had
Yes, I'm quite sure this is how it works - if you scope the snap diode
drive you can quite clearly see both the 60MHz and the 5.3MHz from the
DDS chip mixed together. My assumption is that the DDS output is
subtractively mixed with the 114th harmonic of the 60Mhz inside the
cavity: 60*114 =
Pete
That is exactly the same math I did, there is no other choice but it would
be nice if some one can help on the C field. I just finished mounting it on
a heat sink added a Toshiba 15 V 3 A power supply and a 7805 and will run
it for a month with out changing any thing. Will read it twice
Seems like a lot of folks selling these lately.
Curious minds would like to know why.
On 11/13/2011 07:15 AM, ewkeh...@aol.com wrote:
Pete
That is exactly the same math I did, there is no other choice but it would
be nice if some one can help on the C field. I just finished mounting it on
a
Le 13/11/2011 18:21, Chuck Forsberg WA7KGX N2469R a écrit :
Seems like a lot of folks selling these lately.
Curious minds would like to know why.
I expect they are lots from telecom providers who are are replacing kit
that is being upgraded.
I don't see any date codes on the boxes. Has anyone
here's a different layout
250896271094
-pete
On Sun, Nov 13, 2011 at 3:45 AM, ewkeh...@aol.com wrote:
Paul
it is listing # 250911887702 from ggg*fitting. I think we will see prices
dropping even more since there are only so many time-nuts.
Bert Kehren
In a message dated 11/12/2011
Telcom upgrade, just like where all the Thuderbolts came from
On Sun, Nov 13, 2011 at 9:21 AM, Chuck Forsberg WA7KGX N2469R
c...@omen.com wrote:
Seems like a lot of folks selling these lately.
Curious minds would like to know why.
On 11/13/2011 07:15 AM, ewkeh...@aol.com wrote:
Pete
That
The ones with the 2 labels have a date code as the 4 digit prefix on
the S/N - so a unit that says S/N 0416-756124 was made in week 16
2004. All the ones I've seen date from 2003 or 2004.
The board they were originally attached to was largely empty -
although it did have a label indicating that
Subject: Re: [time-nuts] FE 5680A Warning
The ones with the 2 labels have a date code as the 4 digit prefix on
the S/N - so a unit that says S/N 0416-756124 was made in week 16
2004. All the ones I've seen date from 2003 or 2004.
The board they were originally attached to was largely empty
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
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
They are tempting
-pete (looking at bank account)
On Sat, Nov 12, 2011 at 10:07 AM, ewkeh...@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
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
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
On 11/12/2011 9:46 AM, Don Latham wrote:
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 think those pop-rivets are actually screws with a small hex socket in
the center. That's what
Aha. Well, they were hollow, so I drilled 'em out. Didn't want the big
card anyhow :-)
Don
Rex
On 11/12/2011 9:46 AM, Don Latham wrote:
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
RESENT WITHOUT ATTACHMENTS
Fellow Timenuts,
Here are the clues that will answer some of your questions concerning
the newer
version FEI Rubidiums and also its Kissing cousins from Symmetricom;
the newer
series XPRO and SA22c. It appears both companies have came with up with
same idea
at
Hi Folks,
I played with a few of these that came off the cut up board you describe.
The ones I had put out 1PPS ONLY!
Internally they ran at 8.xx Mhz that divided down to the 1 Hz.
I was able to engineer a tiny add-on board using very small 10Mhz
crystals and made them put out 10Mhz.
By the
Kind of joining in late.
Might this be the epay womart for $49 inclouding shipping?
That really is quite a good price.
May also order one up.
Regards
Paul.
On Sat, Nov 12, 2011 at 5:04 PM, Don Latham d...@montana.com wrote:
Aha. Well, they were hollow, so I drilled 'em out. Didn't want the big
That's it, I think. Look for the large base and the extra crystal,
completely extraneous.
Don
paul swed
Kind of joining in late.
Might this be the epay womart for $49 inclouding shipping?
That really is quite a good price.
May also order one up.
Regards
Paul.
On Sat, Nov 12, 2011 at 5:04
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