[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
Bob Camp
kb8tq at n1k.org
Sun Nov 2 00:19:54 UTC 2014
Hi
If you:
1) Do not have two units (Ref 0 and Ref 1)
— and —
2) Do not “fake out” the slave detect (= use the mod)
Then the unit you have will not:
1) Enable the pps out
2) Enable the 15 MHz out
It will try to disciple the OCXO, but you won’t be able to see any result of that.
Bob
> On Nov 1, 2014, at 7:05 PM, GandalfG8--- via time-nuts <time-nuts at febo.com> wrote:
>
> 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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