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"Michael Coslo" wrote
A few years back I did a modeling of an antenna that was 1/4 wavelength long at I think 40 meters. The SWR of the antenna was approaching infinite. If I get the chance, I'll model it again tonight - I'm doing the mass mailing for the PAQSO party tonight, and if all goes well, I should have a little time. I'd think a strict 1/4 wave, regardless how it's fed, would be pretty horrific on that specific band. (But I couldn't explain why...it's just from what I've read.) That's why I made mine (55 feet) so that it was under 1/4 wave for 40, and more than 1/4 for all the higher bands. As for window line being affected by water... yes, it is, but I never found it a big deal. As I recall, I just retuned some of the transmatch settings to accommodate. I used both 450 and 300 ohm window line... and even tv twinlead. What fun I had one night when I heard a cat playing on my flat roof, and I could tell he was playing with the transmission line that was suspended about a foot off the roof... I transmitted 100 watts and heard him take off like a shot! BTW, I wonder what happened to the OP? Did we drive him away? ;-) Howard N7SO |
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