IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD

Some Directional couplers:

A 6 dB hybrid combiner from junkbox parts

A homemade hybrid coupler/combiner built several years ago and recently characterized.

A classic 6 dB hybrid combiner design

Wideband hybrid coupler, similar to the classic ARRL Handbook design.

The impedance bridge of the N2PK VNA

Measurements of the 6 dB hybrid coupler used as impedance bridge for the N2PK VNA.

A 20  dB coupler for the HF bands.

Measurements on a 20 dB coupler with low-frequency compensation.