Hi Jan---I got some of those ebay units just a month or so ago got them
running!!! I can use my PC to adjust the freq/dds to whatever I want.
I don't have the info right here., as I am not at home now---but as I remember
you ONLY need +15V gnd on the 1st 2 pins. Pin 3 will shoe the lock stat
(goes low after 4-5 minutes). I think pin6 was the output...the trick is that
it puts out 1 very narrow pulse (few microseconds) every secondso run it
inot a counter or a digital scope. You will not see it on a normal scope,
other than seeing it trigger the unit. You should try this to see that the
unit is basically working.
To get the high MHZ freqs, tap into the Rf under the cover (on the DDS
board). The black corner connector strip is indeed your pc connection...I'll
send details later as to the hook up.
Jan Fredriksson [EMAIL PROTECTED] wrote:
Hi time-nuts,
It's an amazing list you have here! I had no idea! A new world to me.
I am new here and this is my first posting.
I recently got one of the Ebay FE-5680A units, originating
from a Motorola telecom board, without a coax out.
I do not even have the Motorola board so there is little to
start with.
I fund some postings on the FE unit, most from 2005,
here on in the time-nuts list.
Did any of you make any progress with this unit and the
pinout and communicating with it? I'd prefer not to fry the
thing right from the start.
I have opened the lid and found that my unit has a RS232
chip, Sipex SP233ACT. There is also a small internal
5 pin connector on the PCB, connected to the RS323
chip Rx/Tx and +5V.
I can trace the front panel 9-pin connector pin 1 / power in
to the onboard VR and pin 2 is ground.
The unit has and a AD9830A DDS for frequency synthesis.
In the product sheet for the FE-5680A it's mentioned that the
unit can be factory programmed to wanted frequency. A good
guess is that it's via this PCB port as RS232 is not available
on the front panel connector as far as I can find.
There are also two pushbuttons on one PCB.
I have seen mentioned in the datasheet that it's for trimming
the frequency.
Well, any input would be highly appreciated. I have searched
the net for all docs I could find but nothing very useful so far.
I will be happy to share my findings if someone is interested.
Neo-Timer Jan
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
