Hybrid Combiners and IP3 measurement -DIY experience

[bozidarms]

Hi to the group

There are shown some IP3 measurements with diy combiner (1-30 MHz).

There is over 70 dBm IMD free dynamic range  in wide band (50 kHz)
and even over 80 dBm in narow band (3 kHz) spacing.
50 ohm terminated combiner have over 45 dBm  port to port isolation.

For one  Manhattan style, open combiner and raw measurements
generator - combiner - analyzer,  results are pretty nice.

What are your experiences about such diy combiners and similar measurements?