SWR
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| Jul 11th 2014, 01:51 | |
WA6ZFMTotal Topics: 0 Total Posts: 0 |
I have noticed, at times, that my SWR meter reading fluctuates, wildly, even after initially tuning to 1:1. I will be transmitting with a 1:1 but, all of a sudden, it will jump up then come back to 1:1. What could cause this sort of thing? Richard |
| Jul 11th 2014, 02:06 | |
K6DMBTotal Topics: 0 Total Posts: 0 |
Richard, it could be something as simple as the wind blowing your antenna around. I use and end fed wire hanging vertically out my window. When the wind gets to a certain velocity, and the wire get about 30 degrees or more from vertical, my SWR's go crazy. |
| Jul 11th 2014, 17:28 | |
WA6ZFMTotal Topics: 0 Total Posts: 0 |
Yes, thanks 9V1DB. Could be. One leg of my ALPHA DELTA DXCC, as an inverted vee, passes through a pine tree. I went out, this morning, and clilpped off some of the branches near the antenna wire. I'll see if that helps. Richard |
| Jul 11th 2014, 20:10 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
Even if the wire is insulated, you can still get significant capacitive coupling to live foliage. The effect is more pronounced at the high impedance ends of the antenna. With a 40M dipole, I was able to reduce my mid-band SWR from 1.5 to 1.2 by cutting off a maple tree branch that was up against the end of the dipole. Zack W1VT ARRL Senior Lab Engineer |
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