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
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