8/18/2023 0 Comments Touch lamps![]() A 1-k ohm resistor was not a complete cure in my case.Ī 3.3k ohm resistor in series with the signal input on the lamp helped on all bands except 80m (an additional 1.8k ohm prevented the lamp from functioning). The problem occurred during operation on the 80- through 15-m bands, but 10-m operation had no effect. I had the same problems as W7OTC with a touch-controlled lamp switched on and off by my transmissions (100 W to a roof-mounted vertical, with two radials per band). I suppose the required resistor value would vary with the RF-field intensity and frequency. An AC-line filter at the lamp did not eliminate the problem.)Ī 1k ohm resistor (in series with the signal input lead to the encapsulated circuit that operates the lamp) cured the problem for me. (I use a ground-mounted vertical antenna for 80, 40 and 15 meters, and the lamp is approximately 150 feet from the antenna. In my case, 40-meter operation gave the most trouble, with 75-meter operation a close second. ![]() I have found a simple cure for those touch-controlled lamps that turn themselves on and off during nearby radio transmissions. Note: Ed Hare, W1RF suggests trying a ferrite core if it can be used. ![]() Ideally, one would use a small RF choke instead of the large PI wound one I found in my junk box. I found that the wire between and RF choke and the input to the IC chip needs to be as short as possible.
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