[Antennas] Signalcrafters SWR Meter?

[David Quick]

Does anyone have any experience with a dual-meter SWR Wattmeter made by
Signalcrafters? It's their model 29, and was made about 1982.

The company is still in business, but they no longer make or support this
device. They used to be in Mission, Kansas and now are in NJ.

What I'm looking for is help calibrating the directional coupler. I have a
schematic for the meter, but the directional coupler isn't shown because as
the schematic states: "The SWR sensor is not field serviceable".

The coupler has the usual toroid and diode arrangement with the feedline
center conductor routed through the center of the toroid. There are two
trimmer caps and two variable resistors, one each for the forward and
reflected sides of the circuit.

I have adjusted it to where is reads forward power correctly, but not SWR.

Can anyone help?





Dave Quick K0EKL
Minneapolis, MN
k0ekl@arrl.net