Home Brew 4-Way Splitter
This is a 4 way GPS splitter that includes amplification to make up
4-way divider loss.
The parts breakdown is:
I moved the line amp outside about in the center of the coax feed to make up for coax loss. Of course the actual GPS antenna, a Motorola hockey puck, has a built in amplifier.
19 April 2003 - By connecting the antenna from a Garmin GPS III Plus
one of the output ports and taping it to the antenna on a military PLGR
receiver the receiver works extremely well, locking onto signals that
Garmin can not capture with a direct antenna connection.
23 Aug 2003 - Added a Trimpack AN/PSN-10
GPS receiver to the
system. This required inserting two more of the DBS satellite
amplifiers between one of the 4-way divider outputs and the trimpack.
5 Sep. 2003 - While experimenting with various amplifiers, I checked
with an Ohm meter and the port I was using showed DC open. Then
applied 18 Volts to get full gain from the Radio Shack (RCA D903)
amplifier and notices that it was drawing way more that 2 of the amps
should draw. Shut down and checked the amps while not connected
to anything and all was well. But when I looked at my reference
GarminIII+ it was not tracking. None of my GPS receivers were
working. Checked the Garmin using it's own antenna and it
worked. Checked outside and the mast top Motorola ANT97 is dead,
it got fried by the 18 Volts, normally runs on +5. Have a Timing
2000 on order.
What went wrong?
Ans: the open I saw was the routing diode in the 4-way divider, once the voltage got above 0.6 V the 18 volts was sent up to the inline amp and to the mast head active antenna.
The fix: Add DC blocks (RS 15-1259) to all of the 4-way divider outputs, except for the one that powering the mast head antenna and in line DBS amp.
The system now looks like this:
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