[time-nuts] 58536A splitter and 9390-6000 GPS

[WB6BNQ]

Robert,

Two questions.

First, what is the voltage at the 9390 antenna connector with nothing attached
besides your DVM ?

Second, what happens if you just attach the antenna straight to the 9390 ?  By
this i mean if voltage is on the antenna connector and while you are observing it
and then attach the antenna what happens ?

I suspect there is some protection process with the 9390 and the load or reverse
voltage present from the splitter is causing it to activate.  However, I am not
familiar with that unit.  Just asking general troubleshooting questions.

Bill....WB6BNQ

Robert Watzlavick wrote:

> I received my Symmetricom 58536A GPS antenna splitter today (new from
> eBay) and did some testing with my Datum 9390-6000, Datum TS2100, and
> Thunderbolt.  The Thunderbolt and TS2100 work fine with the splitter but
> the 9390 has some interesting behavior with the splitter.  If the 9390
> is connected by itself to the splitter, it doesn't report any
> satellites.  However, if I then connect either of the other two
> receivers (Thunderbolt or TS2100) to the splitter, the 9390 will start
> picking up satellites.  Then, if I disconnect the other receivers and
> leave the 9390 connected by itself, it continues to work.  I tested this
> several times and it seems to be repeatable behavior.  So as long as a
> different receiver has been connected to the splitter at least once, the
> 9390 works with it.
>
> I'm thinking the initial surge of connecting the 9390 to the splitter is
> causing a momentary overcurrent which shuts down the antenna supply.  In
> the "failure" case, the voltage measured (with a T) at the splitter from
> the 9390 is 0V.  In the "working after a different receiver has been
> connected" case, I measure 4.3V.  The other two receivers output 5V with
> no load and about 4.6V under load connected to the splitter.
>
> Has anybody seen this before?  The antenna is a Symmetricom AT575 type
> antenna.
>
> -Bob
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.