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Saandy , 4Z5KS wrote:
What we did was one of two things: either tune the system for maximum current in the line or else used a light bulb in conjunction with a small light bulb and tuned for maximum brilliance. in neither case was SWR involved in the mess. It was around 1949 when I started hanging out at W5OLV's shack. He had a homebrew 1625 transmitter with a parallel tank circuit. The plug-in tank coil had a few turns of wire wrapped around the bottom and that was the transmitter output. He didn't use a tuner. He had a pickup loop that he slid up and down the line until he located a current maximum point. He cut the line at that point and fed it directly from the transmitter. He added or subtracted turns on the plug-in coil until he was satisfied. I didn't really understand what he was doing until I studied the Smith Chart in college almost ten years later. I now use that same basic technique with my 50 ohm SGC-500 amplifier. -- 73, Cecil http://www.qsl.net/w5dxp |