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

Tue Nov 4 05:15:48 UTC 2014

Hi

Feeding antenna bias through the “stuff” on the module does not let you handle shorts and strange stuff as well as an outboard solution. I guess they wanted it built tough. 

The crazy deal with re-stuffing a slave is that there probably are 7  0402 sized resistors on the board that control some aspect of the changeover. I’m sure that finding six of them will be easy. Finding the 7th never seems to work out for me. I’ve seen a lot of troubleshooting and inspection done on boards far less complex. Without some sort of automated system … it’s a lot of time.

Bob

> On Nov 3, 2014, at 9:49 PM, Tom Miller <tmiller11147 at verizon.net> wrote:
> 
> Some of the parts on the underside are to provide power to the antenna. It does not use the GPS rx to do that. I guess they also detect any antenna fault.
> 
> 
> ----- Original Message ----- From: "Anthony Roby" <aroby at antamy.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Monday, November 03, 2014 2:23 PM
> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,Z3811A, Z3812...
> 
> 
>> The photos I posted at http://goo.gl/87e8GG show the differences between the two boards - there is more to it than just adding a GPS board.  The underside has a bunch of additional components beneath the antenna connector.
>> 
>> Anthony
>> 
>> -----Original Message-----
>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of GandalfG8--- via time-nuts
>> Sent: Monday, November 03, 2014 12:00 PM
>> To: time-nuts at febo.com
>> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
>> 
>> Hi Arthur
>> 
>> Thanks for your further comments, and certainly no need for the  "sorry".
>> 
>> It was your pioneering work that inspired recent efforts to  start with, and the confusion over the pin numbers that led Gotz to the, just grounding pins 2 and 3, 2 link solution we have now.
>> 
>> Overall, I'd say, not a bad result:-)
>> 
>> Good luck with the 10 MHz conversion, I'll probably do that soon as well, after bringing out the 5 Mhz, but for now I'm just letting them cook whilst monitoring the 15MHz.
>> 
>> As has been previously commented, aside from the GPS module, there seems to  be very little difference between the Ref-0 and Ref-1 modules, and I'm quite tempted to make up my own patch lead, whip out the GPS module from one of my Ref-1 units, and then couple the two Ref-1s together to see how they cope with that:-)
>> 
>> Regards
>> 
>> Nigel
>> GM8PZR
>> 
>> 
>> 
>> 
>> In a message dated 03/11/2014 17:13:15 GMT Standard Time, golgarfrincham at gmail.com writes:
>> 
>> GandalfG8 at aol.com GandalfG8 at aol.com Sun Nov 2 09:08:30 EST  2014
>> wrote:
>> 
>> "Ooh err, whoops, and oh dear !!
>> 
>> Arthur, I've only  just had a chance to look at your latest photos, and unless I've really got  my wires crossed, if you'll pardon the expression:-), your links on J5  are not shown on pins 2, 10, 12, and 15, but on pins 4, 6, 11, and  13."
>> +++++++++++++++++++++
>> 
>> Darn-I'm glad someone was paying more  attention than I was when I wrote that years ago. Apparently when I was  documenting what modifications I had made I just picked up a 15 pin D plug  shell to get the numbers instead of looking at the obvious numbers on the  RFTG socket connector and those connectors being mirror images have the  numbers reversed. I was out geocaching yesterday and didn't catch up on the  new posts until this morning so I'm a little late in responding. I also  checked to see if I had any other scribbles on the changes I made and found  this: "If pin 2 is held low the 'ON' LED will flash. A pulse low will turn  it on.
>> The RC timer holds pin 2 low to flash for about 6 seconds so you  can see it actually happens then pin 2 returns high and the 'ON' LED  stays on solid."
>> 
>> So apparently some of the parts I added were to  just make the light look like they were working correctly (can you spell  OCD?) and may not be necessary. As I originally said, this was a hack and I  wanted others to duplicate what I had done to see if any of it made sense  to them. At least it appears that by adding the circuit I came up with  and/or adding jumpers you can get the RFTG-u REF 1 unit to work without the  slave unit.
>> I just ordered another RFTG-u REF 1 and will see if I can  modify that and get it to output 10Mhz instead of 5Mhz like my original  unit.
>> 
>> Sorry about the screw up on the  numbers.
>> 
>> -Arthur
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