[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
Bob Camp
kb8tq at n1k.org
Sat Nov 1 22:00:21 EDT 2014
Hi
I’ve watched the two boxes fire up. They spend a bit of time blinking lights on this one and then on that one. From watching the “dance”, I think that the transistor delay circuit (or something like it) is indeed needed. There are multiple ways the delay and sequencing could be implemented. A cheap 5V PIC is certainly one way to do it. With no voltage coming out on the connector doing a purely external solution probably is going to require external power. I think I’d at least bring that out on one of the many unused alarm pins.
Bob
> On Nov 1, 2014, at 9:52 PM, GandalfG8--- via time-nuts <time-nuts at febo.com> wrote:
>
> Hi Bob,
>
> I understand the consequences of not modifying the unit but, having done so
> and having a REF-1 unit running stand alone, I was just commenting that I
> wasn't sure whether or not it was necessary to implement all of Arthur's
> modification in order to enable the basic functionality, or whether some
> part of it might be purely to control the indicators.
>
> As a follow on from that I was wondering whether or not it might be
> possible to achieve a similar result, at least to the point of just making it
> functional, just by cross linking some of the out and return paths, "faking"
> it without the need for an additional powered interface if you like, not for
> any other reason than it might then be possible to make a plug in
> modification that could be fitted without needing to open the box.
>
> Regards
>
> Nigel
> GM8PZR
>
>
>
>
> In a message dated 02/11/2014 00:19:57 GMT Standard Time, kb8tq at n1k.org
> writes:
>
> 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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