I am currently updating some of the antenna material in the RSGB Radio
Communications Handbook.
I have a question about SWR meters.
In my early days of amateur radio I didn't have an SWR meter. I obtained
some idea of antenna/feeder mismatch by using a multiple of half wavelength
of coax and measuring the antenna feed Z using the Pi output capacitor
(suitably calibrated) of the transmitter.
At about the same time I was a RADAR technition in the RAF. When a magnetron
was replaced on 3cm equipment (H2S)

Wasn't H2S 10cm equipment?

Mike
J.Powell