[time-nuts] Component level 1:2 splitter
Dan Rae
danrae at verizon.net
Mon Mar 10 18:23:24 EDT 2008
randy warner wrote:
>Guys,
>
>I need to come up with a 0db little splitter to route 1 antenna into 2 GPS
>receivers. To keep the isolation up I want to use an active splitter instead
>of a passive one.
>
Randy,
For a long time I used a passive splitter made from a swap meet $1 MCL
(minicircuits) 1 to 2 GHz splitter / combiner. Isolation of these is
good, around 30 dB, and the extra 3 dB loss will not be noticed in the
majority of cases. This one had SMAs all round and DC continuity
through from the A and B ports to the Common. I blocked one path to DC
with a 100 pF SM capacitor. If you need the Rx connected to the blocked
path to think it is feeding an antenna a series R and L combination with
a 220 Ohm R will fool the Rx in question.
I really would not think you will need any gain. For more than two
receivers though I would recommend the hp / symmetricom (?) 4 and 8 way
active splitters that can be found on eBay. If you did want gain there
are a lot of MMICs that will do the job.
I've given it away a while back so can't give you any further details,
but for two receivers this worked well for me. For my growing collection
of gps units here I now need more than two...
Dan
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