[time-nuts] GPS Antenna (50ohm) and Satelite Splitters and Amps(75ohm)

[John Ackermann N8UR]

Hi Don --

I know of several folks who've used the satellite stuff with pretty good
results, so I'd give it a try.  I may be wrong about this, but my gut
feeling is that you would want to arrange things so that the longest
cable runs (with the most loss) would be terminated in their
characteristic impedance, to reduce increased loss due to SWR (though it
might not make much real-world difference).  So, assuming the antenna is
designed for 50 ohms, you'd use 50 ohm cable from the antenna to the
splitter.  The shorter runs from the splitter to the receivers wouldn't
be as critical.

Hope this helps.

John
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Don Mimlitch said the following on 04/16/2006 08:09 PM:
> I want to split my best 5 Volt GPS Antenna among several Time Standards Systems (some 5VDC and some 12VDC).
> I can get inexpensive Satelite Splitters (2GHz) from Radio Shack or Monster makes a 4GHz Splitter. These splitters are 75 Ohm but my Antenna and Receivers are 50 Ohm.
> My question is how much of a problem is this? Should I use 75 Ohm Coax on either side? Is there a circuit to correct any problems?
> I can also get a Radio Shack InLine Satelite Amplifier. Again 75 Ohm. Any other problems here?
> 
> Thanks for any Help or Advice,
> Don Mimlitch
> donmeis at yahoo.com