[Antennas] Signalcrafters SWR Meter?

Wed, 27 Feb 2002 16:39:58 -0500

David,
The best/easiest way to calibrate the 'reverse' portion of the coupler
is easy:  Turn it around and calibrate it as if it was the 'forward'
portion.
Don
N8DE

David Quick wrote:
> 
> 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
> [email protected]
> - - -
> 
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