[time-nuts] Fw: Lucent KS-24361

[Bob Stewart]

Hi Hal and Bob,

When the GPS receiver in my Z3805 reached it's limit, it would not even start a survey unless I had set the date using some calculation I found.  (I think I had to subtract 1024 weeks from the current date and put that in.)  But, I found a different revision of the receiver board in my "GPS stuff" and when I put that one in, the problem of having to manually set the date was gone.  I believe these are Motorola VP boards, but I could be wrong.

As to RS-422 and comms with the unit, I did find a 9-year old post of my own that mentioned an odd problem with my RS-422 interface adapter.  So, I'm going to get a replacement to see if it's just my RS-422 interface adapter.  I did find the conversation started by Stewart Cobb that has all the pins etc listed for J8.  So I'm good for that.

Bob 

   ----- Forwarded Message ----- From: Hal Murray <halmurray at sonic.net>To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>Cc: Hal Murray <halmurray at sonic.net>Sent: Wednesday, September 13, 2023 at 07:30:55 PM CDTSubject: Re: [time-nuts] Lucent KS-24361
 
> I was wondering if these things have maybe fallen foul of the 1024-week GPS
> bug?

That will just give the wrong date.  Other than that, it should work normally.


> So far I'm not getting anywhere 

The GPS module in that gear is pretty old.  It will take a while to get going. 
 How long did you wait?  How good is your GPS antenna?  Try waiting longer.


[From memory, so I might scramble something.]

There are 2 boxes.  The GPS unit is in one.  The 10 MHz comes from the other.  
There is a 15 pin cable to connect them.  If you don't need the 10 MHz, you 
don't need the second box.

If you don't have the second box connected, the LED on the GPS box won't go 
green.


There are 2 9-pin serial connectors on each box.  They are RS-422 
(differential) rather than RS-232.

I don't have the pinout handy.  I've talked to one with just wires from a PC 
serial port, no level shifting.  The port labeled Diag defaults to sending 
something every second and doesn't have a PPS.

-- 
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