[600MRG] Checking SWR

[Murray Greenman]

Hi,
If anyone is interested, I can supply details for the SWR Bridge / Power 
Meter incorporated in the Southern Avionics SC1000 USCG transmitter.

The beauty of this device is that it uses no ferrite, just two simple 
coils wound on 20 mm plastic formers. It is a Breune coupler type, so is 
flat with frequency. It's designed for 1 kW output, but works fine at 
100 W. I've used it on 2200 m and 630 m.

Since I know you'll be impatient, I've attached the schematic, and 
here's a small photo of the board:


Each of the coils has a two-turn primary on top of a 10-turn (or 
thereabouts) secondary, with a decent layer of insulation between.

73,
Murray ZL1BPU


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