back to 4 port combiners

2 rev2 (2018):


After some years, I decided to make more compact and even portable dopplers. I had several DDF-1's by
this time, but only one combiner box that was getting moved around a lot, so it was time to make a new
one. Solder dragging was used this time for construction.

1 combiner layout	2 combiner top	3 combiner bottom

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