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#1
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Hi Bill
The monster cable I had was ultra fine stranded to about size #8 copper, very thick. It was only 8 years that it was up before I moved, and in that time it did not get brittle although it did change from clear to amber over that timespan. I was able to roll it up and bring it with me and saw no signs of cracking. But even if the insulation came off completely, it wouldn't affect it as far as ladder line goes. I was even thinking of stripping the insulation before using it for ladder line, but it was somehow molded onto the wire braid which would make stripping it quite hard. So I used it as is. FWIW: My son who is a Hi Fi buff, is now using something similar in appearance to our RG8U but in a twin housing, like some twin Cable TV cable. I have no idea of the impedance or actually what it is he is using. But he seems to like it better than the Monster Cable. TTUL Gary |
#2
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Bill,
I used a loop fed with ladder line through a tuner for years. Worked pretty well on all bands but 15 meters. It wasn't the highest thing at all, but did fine for my uses. I placed a board in a window to feed the ladder line through. Drilled a couple of holes, fed a couple of short sections of wire through them, sealed them with 'hot glue' and had no particular problems for years (no water leaking in, etc.). I couldn't tell you the exact length of the feed line, I never knew, and since there were no problems, I really didn't much care how long it was. My tuner has a balun in it (suspect a 4:1?) and handled the impedances well even at full legal limits. My loop came down in an ice storm a couple of years ago and as soon as I get over my 'bout' of lazy, I'll put it back up. I didn't have any unusual FRI problems (the neighbors did, but that's a different story, and one that was solved). The phone and computer are only a couple of feet from the entrance point of the ladder line and radio/amplifier. Curing telephone and computer RFI isn't what you asked about so I won't go into it (mine's solved anyway). Have fun... 'Doc zeno wrote: Seems like everyone I talk to about using ladder line to my proposed 540' horizontal skywire loop does a double take when I say I want to use ladder line into the shack. I was curious if there are any fans of ladderline feed systems who can relate positive experiences, or am I about to really court disaster here. The ARRL antenna book says that coax to this type of antenna is not as "multiband" friendly as was once fantasized....they recommend ladder line. Anyone actually have such a loop? What is your experience? Bill, K6TAJ |
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