On 07/04/13 05:01, WB6BNQ wrote:
Hi Alec,
You may be in luck. However, I would need some additional pictures,
particularly
of the connector on the bottom, also some of the inside.
Bill,
Thanks for your reply! Here are some photos of the inside:
http://m0tei.co.uk/fe5650pics/
You'll see that it comes with a custom machined plate screwed onto the
front - this was how it was mounted in the thing i pulled it out of. It
can be removed but i found it easier to take the thing apart with it on.
A thermostatic switch used to bolt onto it to (presumably) act as a
thermal cutout.
You'll also notice that the boards we're probably interested in are
potted it some sort of white compound - it's hard but crumbly - feels
like some sort of polymer foam. I've started to pick it off a bit but
could you just confirm that this is actually a sensible thing to do
before I go all out scraping it off? Thanks!
The primary physics package is a stand alone analog Rubidium frequency standard
that outputs 50.255* MHz frequency. That signal is used to drive various output
board configurations, included inside the unit, to provide a customer required
output frequency. The more recent revised units (they look the same) use a new
digital scheme that is much more of a hassle.
This unit is probably from late 1996/1997 if that helps?
The one that I and a number of people are familiar with is the 5650-option-58
model whose output was a 1pps. To get the 1pps the 50.255+ MHz signal was used
to drive a Direct Digital Synthesizer (DDS) that produced 8.3+ MHz signal that
was then divided down via normal TTL dividers to produce the 1pps. The DDS is
capable of being changed to other frequencies up to about 20 MHz, however, the
filter following the DDS needs to be changed or bypassed to properly filter the
new frequency. Bypassing is the easiest method but would require using an
external filter to get rid of aliasing and spurs.
I put together a zip file of various information on FEI-5650-option 58 that will
help you get familiar with the family line. If you have problems with the link
let me know. Also, after you get a successful download let me know so I can
reduce the FTP storage level, thank you.
http://pages.suddenlink.net/stevewingate/cryptic1/for alec on 5650-option-58.zip
Bill....WB6BNQ
Awesome, looks like there's some great info there! Unfortunately i'm not
sure hoe relevant it is to mine since my option doesn't seem to do RS232....
On 07/04/13 04:17, Herbert Poetzl wrote:
>
> Open it up, take some nice pictures of the circuit boards
> and components and I can probably tell you what might be
> possible (after looking at them :).
>
Thanks Herbert! Pictures above^
>> As far as i'm aware this model doesn't have serial control.
>
> best,
> Herbert
>
Best regards,
Alec
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