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Smith chart/SWR/multiband dipole
I have a question regarding dipole length, SWR and Smith charts. I'm using a 40/80 trap dipole and wish to lengthen the 80M portion to lower the SWR in the CW part of the band. I'm reading a SWR about 1.2:1 at 3.8MHz, 4.8:1 at 3.5MHz, which I wish to drop a little to ease up on the auto-tuner in my radio. I plan on adding a couple of feet and remeasure and I'll probably be close enough for rock and roll. Now, I use this antenna on other bands - I can load it on 20 (SWR 3), 15 (SWR 3) and 10 (SWR 3.2). I'd like to know what the impact of adding another 2 ft to each side will do on these bands. So - looking at the Smith chart, I can draw my circles for each band and I can measure the physical length of each side of the dipole. How do I relate length to SWR on the chart? And, would this be useful to first-order? The whole function of a dipole is to radiate, so is this a very lossy system, or would this be close enough to lossless to get a good look? Thanks for your thoughts Mark/n0lf |
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