Can anyone post any informationon or web addresses on phase matching and
batch / set matching of coax cables? I am interested in principles and
procedures to phase match coax cables. Phase matching involves cutting coax
cables to the same electrical length. The phase matched cables can then be
analysed and put into batches or sets i.e. cables with similar
characteristics and frequency response are put into a set. What would be
analysed to form a set?

This practice is used on coax cables that feed antennas for satellite
systems. For example, if several antennas receive GPS signals, to
triangulate position, the GPS signals must all arrive at a particular point
at exactly the same time.

It also appears that going for the best quality low loss cable can actually
be worse, because using lower quality coax cable with some loss can dampen
the reflections from in-line connectors.

Stages are 1) phase matching 2) batch matching 3) assemble cables chosen by
batch matching process onto RF system and perform vector generation. A
vector gen file is created which is a calibration snapshot of the system
i.e. records the RF performance in the form of a signature or footprint.

Measuring instrument is a Network Analyser HP8753.