[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

Sun Nov 2 16:38:29 UTC 2014

Hi

Be a bit careful there. 10 MHz times some nutty number comes up in the middle of the GPS passband (harmonics are spaced 10 MHz apart …). The GPS module may not be very happy with a CW jammer right on top of the signal it’s trying to receive. The logic chips involved to have rise times dimensioned in nanoseconds. There will be *some* energy up at 1.5 GHz.

Bob

> On Nov 2, 2014, at 10:16 AM, Azelio Boriani <azelio.boriani at gmail.com> wrote:
> 
> I found that in the unit with the GPS, near U206, there are 3 resistor
> not populated: the squared 10MHz is present, so if resistor are added
> and the capacitor (I presume some 100pF) you ruote the 10MHz under the
> GPS antenna connector. Resistor are 100OHM, as seen on the unit
> without the GPS.
> 
> On Sun, Nov 2, 2014 at 1:19 AM, Bob Camp <kb8tq at n1k.org> wrote:
>> 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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>> 
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