Re: [time-nuts] FE-5680A pinout

2011-04-20 Thread Joseph Gray
I know that several list members have bought FE-5680A rubidiums. Of
all the various ebay sellers that you have bought this model from, who
would you recommend? If I wanted a straight 10MHz unit vs a frequency
agile unit, would you recommend a different seller?

Joe Gray
W5JG

On Wed, Apr 20, 2011 at 1:02 PM, Murray Greenman
murray.green...@rakon.com wrote:
 The confusion is understandable. There are so many different variants of
 the FE-5680A, and they are not easy to identify.

 Some of the information you see out there is from folk who measure the
 voltage on the pins with a meter, not understanding what they are
 looking at. When I've investigated such devices (I have several FEI
 units) I start by tracing my way back from the power supply regulators
 to determine where the power goes in, and what it should be, to avoid
 mistakes. It's also been a useful technique with things like GPSDOs
 where nothing is known about the pinouts (Trimble NTGS-50AA for
 example).

 Sure is frustrating when you have one that isn't frequency agile! One of
 my FEI units is an FE-5680B with only 1pps output. The Chinese supplier
 thought it was faulty, but the 1pps pulse is only 5us wide, and isn't
 present until the unit has locked. I found a very useful 60MHz reference
 inside the unit as well.

 73,
 Murray ZL1BPU


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Re: [time-nuts] FE-5680A pinout

2007-09-23 Thread Stan W1LE
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Hello Jose,

Try:http://www.freqelec.com/prod_pdf/FEI%205680A%20Rb.pdf

Frequency Electronics Inc.  =  FEI

This .PDF may shed some light.

Be sure of the options you have. base unit has 15 VDC, other options use 
a different voltage
for power.

May have to go inside and solder a coaxial cable, to get the Ref. output 
outside.

If you need more help, send an email to the factory info desk.
They were quite helpful to me.

Stan, W1LE   FN41sr   Cape Cod



Jose Manuel wrote:

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Hello all, this is my first participation here, as I´ve just joined this 
interesting group.

I´m trying to test a Rb oscillator FE-5680A, but I don´t have information 
about the DB-9 connector pinout, because this model doesn´t have any rf out 
coaxial connector. I hope someone can help about this issue.

Thanks in advance, José, EA1PX

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Re: [time-nuts] FE-5680A pinout

2007-09-23 Thread Rex
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Stan W1LE wrote:
 ); SAEximRunCond expanded to false
 Errors-To: time-nuts-bounces+rexa
 Hello Jose,

 Try:http://www.freqelec.com/prod_pdf/FEI%205680A%20Rb.pdf

 Frequency Electronics Inc.  =  FEI

 This .PDF may shed some light.

 Be sure of the options you have. base unit has 15 VDC, other options use 
 a different voltage
 for power.

 May have to go inside and solder a coaxial cable, to get the Ref. output 
 outside.

 If you need more help, send an email to the factory info desk.
 They were quite helpful to me.

 Stan, W1LE   FN41sr   Cape Cod
Seems there are lots of versions of the FE-5680A. Several of us bought 
versions a few years ago that did not match other known information 
(like the link above).

Here is a link to a message I posted back then about what I had learned 
by digging into my unit:
http://www.mail-archive.com/time-nuts@febo.com/msg01569.html

The ones we bought needed 5V in addition to 15V into the DB9 to operate. 
The 10 MHz output did come out on one of the pins on that connector. I 
think that output pin did match the general information.

In spite of the fact that tracing circuits on the board showed RS-232 
I/O pins on the DB9 and also on an internal header, and with several 
people searching for information, we never did figure out any way to 
adjust the frequency of our versions of the FE-5680A.

Stan's, post that he actually got a helpful response from FEI seems 
contrary to our attempts back then. I just did a quick browse of their 
web pages today and got a bunch of circular links that never produced an 
email address that looked like it might be worth a try. Maybe I missed 
something. Stan, care to share any pointers on how you found this 
'factory info desk'? I'm not trying to be sarcastic, just wondering, 
because everyone got blown off, back then, when we were looking for any 
clues on our units.

My impression of FEI is that they, like many other companies, cannot be 
bothered with talking with anyone who has not, or may not, give them 
lots of money. That is certainly their right, doesn't mean I like it. 
Also, it may be possible that if you find the right person, you might 
actually get good help. I did that with a different company a while 
back, by finding an engineer who helped a lot, and then later got a 
delayed reply from someone else telling me they had no time to tell me 
about old units, but if I would want to buy a few thousand to my specs 
they would be happy to help.

So, for the OP, there seem to be many versions of  these units, all 
labeled FE-5680A. There seems to be no absolute answer on pin-outs. If 
you are lucky, your unit will match one of the published configurations 
and be adjustable using RS-232 command sequences. For the ones we found, 
we only got them operational by reverse-engineering (results in the 
archive link), and I have never found any way to get mine really exactly 
enough on 10 MHz even though other units seem to be programmable, using 
published command sequences, over a wide range of frequencies.

-Rex, KK6MK


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Re: [time-nuts] FE-5680A pinout

2007-09-23 Thread Peter Vince
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Hello José,

 I managed to get a Technical Manual Word document for the 5680A Option 2 
a
little while ago, and have put it (together with some5650A files) in a zip file
on my web site:

 http://www.barney-wol.net/private/5650Afiles.zip

Admittedly the model described has an RF coaxial output connector, but hopefully
there will be enough in common with your version that you can glean what you 
need
from that document.

  Regards,

   Peter Vince  (London, England)


On Sun Sep 23  1:11 , 'Jose Manuel' [EMAIL PROTECTED] sent:

I´m trying to test a Rb oscillator FE-5680A, but I don´t have information about
the DB-9 connector pinout, because this model doesn´t have any rf out coaxial
connector. I hope someone can help about this issue.

Thanks in advance, José, EA1PX


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