Ron, Thanks for all the testing. That is good to know.
Hi All. There has been a little bit of concern expressed in a few posts about the correct way to wind the 10 turn windings on T507 which, along with two diodes, 6 resistors and 2 capacitors make up the SWR sensing circuit in QMX and QMX+. I did an experiment today that proves it does not matter which way the windings lay down on the binocular toroid, either top to bottom on both halves (clockwise on one side and Anti-Clockwise on the other), looking at one end of the binocular, or top to bottom on one half and bottom to top on the other (both windings either Clockwise or Anti-Clockwise). The reason for this is that the actual turns direction through the center of the core and around the outside is always the same no matter how you wind it. The instantaneous current flow and magnetic field are in the same direction in both configurations.?
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I built up two binocular cores. I wound one each in each of the two above configurations and connected them to a breadboard model of the circuit used in the QMX/QMX+. I took the two output voltages (FWD and REF) to two old VU meters to show analog outputs for the test.
I put about 4 watts of RF into the circuit and attached a dummy load for one test of each and an antenna with some SWR for the other test of each. Attached are photos of the dummy load test. The meter on the left is showing Forward power and the one on the right is Reflected. The two test results are virtually identical. Results for the tests using an antenna with 2.4:1 SWR both showed less forward power and some reflected power as would be expected, again both virtually identical.?
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I hope this alleviates any concerns about how to wind T507. Best 73 .... .Ron
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