[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
GandalfG8 at aol.com
GandalfG8 at aol.com
Sat Nov 1 19:05:24 EDT 2014
Hi Anthony,
It's a new circuit that has to be inserted, which is what I've done, but
I'm not sure whether or not it's strictly necessary for the unit to function
or whether it's just there to get the lights sequencing properly and
perhaps all that's needed for basic functionality are just the links.
I'm leaving well alone for now to let the oscillator run overnight but
will try it again tomorrow with just the links and see what happens.
I'm also hoping to get some idea of the between unit signalling, although
I only have Z3811s I'm hoping, with the boards being an almost identical
match, that what goes one way should be matched by what comes the other.
Regards
Nigel
GM8PZR
In a message dated 01/11/2014 22:41:09 GMT Standard Time, aroby at antamy.com
writes:
I wasn't clear from the photo whether the circuit was a representation of
what is on the board, and you just had to connect the pins listed together,
or whether this was a new circuit that had to be inserted. Sounds like
the latter?
Anthony
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of
GandalfG8--- via time-nuts
Sent: Saturday, November 01, 2014 4:04 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,
Z3811A, Z3812...
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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