I realize that, in theory, the designs for these things are relatively
straightforward. Unfortunately, the *vast* majority of my experience is
in the digital world, so the best I could probably do on my own is
Frankenstein some hopefully-appropriate circuits together and hope the
result is usable.
...that's a bit too luck-based for my tastes, so I was hoping someone
had already put something appropriate together that I could just lay out
and build. I'm actually a bit surprised that (apparently) nobody on
this list has done so, given how many GPSs we all must collectively own...
(...anybody want to? I'll fund the PCB & components for you to test your
design...)
-j
The standard design is pretty simple:
1) DC bias coupler on the input
2) Protection on the input
3) Saw filter on the input (say -3 db)
4) Fairly normal (Mini Circuits) low noise amp with appropriate gain (say 12 to
18 db)
5) two way splitter for the two banks of outputs (-3db)
6) two way splitter to each output (-3db)
(obviously a 4 output device)
7) 3 db (to 9 db) pads on each output
8) DC blocks on all but one output.
9) DC bias coupler on the one “magic” output.
Some designs put a second filter after the amp. Some designs use ceramic
filters rather than SAW’s.
Some designs go up to quite a few (like a dozen) outputs. Some have external
power rather than
the bias pickoff / pass thru.
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