[AMPS] SWR Protection

[Peter Chadwick]

Chcuk said:

>In a high-power radar that I once used, "SWR" sensing was able to shut off
>the PA within one microsecond.  

I worked on a satellite ground station tx some 35 years ago. (10kW CW at 6GHz).
That had a fibre optic  cable looking down the waveguide towards the antenna; if
an arc started because of excessive VSWR, the light was detected in a 931A
photomultiplier and used to shut the RF down in under 1 microsecond. The arc
would run along the guide until it hit the TWT output window. As the TWT's price
in today's money was about $500K, it was worth protecting......

73

Peter G3RZP



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