[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
GandalfG8 at aol.com
GandalfG8 at aol.com
Sat Nov 1 17:03:42 EDT 2014
Well, I'm happy to report that Arthur's modification does do the trick,
although I don't know why as I don't have any data for the interface as yet.
I daren't disturb the 15 pin connector right now as this Z3811A PCB is
still out of its case and connected to a breadboard with wires just pushed
into the sockets, and for the same reason I don't have any computer connection
at the moment either.
My implementation isn't quite as described, in that I've not made a
connection to the fault LED but am just manually pulling that input high and low
on the breadboard with another wire link as required.
Whether or not this is part or all of the reason that my green "on" light
is flashing rather than steady I don't know, but I am seeing the 1PPS and
15MHz outputs and the 15MHz looks to be conditioning ok.
Aside from the 5 volt supply, which I'm picking off from pin 5 of the
header between u33 and U34, and the aforementioned fault LED connection, all the
other connections can be made to J5 externally and could be housed in a 15
way shell along with the switching circuits.
I'm still hopeful that some cross linking of the right pairs might achieve
the same result without the extra circuitry, so "all" that needs to be
done now is just to identify the right pairs:-)
At least with it up and running it should be easier to check out some of
the inter-unit signalling.
Thanks Arthur, your efforts are much appreciated.
regards
Nigel
GM8PZR
In a message dated 01/11/2014 15:25:02 GMT Standard Time, aroby at antamy.com
writes:
For those who missed it, Arthur's post is at
https://www.febo.com/pipermail/time-nuts/2010-June/047825.html and the photo is at
http://i906.photobucket.com/albums/ac262/rjb1998/RFTG-uREF1photo1_zps87c505ca.jpg
Anthony
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Arthur
Dent
Sent: Friday, October 31, 2014 9:20 PM
To: time-nuts at febo.com
Subject: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,
Z3811A, Z3812A GPSDO system
Bob Stewart bob at evoria.net
?? ? I have both of my units sitting on the bench. I found that I needed
to connect them together to get the REF1 unit to come out of standby ? . ??
Bob Camp kb8tq at n1k.org
??I suspect that somebody will have to figure out what the 15 pin
connector / jumper is doing. On previous RFTG units there was a way to re-wire the
crossover interface to fake out the slave detect process. That would let
you run a single GPS equipped box and have it behave correctly. Without the
fake wires trick none of them played nice without the slave being present ?
. ??
++++++++++++++++++++++++++++++++++++++
Reposting what I had posted over a week ago, in case you missed it ? .
Arthur Dent golgarfrincham at gmail.com Wed Oct 22 13:59:48 EDT 2014 ?? ?
Way back on Fri Jun 11 16:48:43 UTC 2010 I posted about using one of these
units I had modified but at the time there wasn't a single person who was
interested. I have been using the RFTG-u REF1 since then and it is a nice
unit. The modifications I added (including a power supply -see photo) allows
the lights to cycle through their normal sequence on warm-up and the
second unit isn't needed at all ? . ??
-Arthur
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