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#1
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Feeding Ladderline thru window
I have a vertical slide window in my ham shack. In order to feed my coax fed antenna systems through it, I have made a 3/4" thick piece of partical board, about 6" tall amd ,mounted a couple BNC feedthru adapters in it. This works quite well for coax. The window frame itself is plastic. I would like to use a balanced tuner in my shack, about 2 feet from the window, and feed ladderline to my antenna. Question: What is recommended to feed the ladderline through the particle board? Could I just drill and mount a couple #6 brass bolts with solder eyes on each side of the board and use it to connect ladder line, or is something else recommended? Will this have any measurable effect on efficiency? Thanks. Ed K7AAT |
#2
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On Fri, 18 Mar 2005 03:41:27 GMT, Ed
wrote: I have a vertical slide window in my ham shack. In order to feed my coax fed antenna systems through it, I have made a 3/4" thick piece of partical board, about 6" tall amd ,mounted a couple BNC feedthru adapters in it. This works quite well for coax. The window frame itself is plastic. I would like to use a balanced tuner in my shack, about 2 feet from the window, and feed ladderline to my antenna. Question: What is recommended to feed the ladderline through the particle board? Could I just drill and mount a couple #6 brass bolts with solder eyes on each side of the board and use it to connect ladder line, or is something else recommended? Will this have any measurable effect on efficiency? Thanks. Ed K7AAT I use a couple of big ceramic feedthrough insulators from Surplus Sales of Nebraska. They're mounted on a board in the bottom of my window. The slight impedance bump from the feedthrough bolts seems to have no effect on the ladderline. The settings on the tuner were the same before and after installing the feedthroughs. In another recent thread some recommended using two pieces of coax to feed ladderline through a wall or whatever. Another idea would be two double-female so-239 feedthrough's, plugging the ladderline into each center hole with banana plugs (banana plugs fit the center hole in an so-239 just fine). Bob k5qwg Bob k5qwg |
#3
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[stuff cut]
Another idea would be two double-female so-239 feedthrough's, plugging the ladderline into each center hole with banana plugs (banana plugs fit the center hole in an so-239 just fine). What is a "banana plug". I've seen it mentioned a few times but haven't a clue. Jerry |
#4
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Jerseyj wrote:
What is a "banana plug". I've seen it mentioned a few times but haven't a clue. They are the connectors on the ends of your Simpson meter leads. They have four springs that ensure a wiping action and a snug fit in the sockets. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#5
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A Google search for "banana plug" brought about 67,000 hits. The very
first one has lots of pictures. I'll bet more than a few of the others do, too. Roy Lewallen, W7EL Jerseyj wrote: What is a "banana plug". I've seen it mentioned a few times but haven't a clue. Jerry |
#6
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Roy,
What wiould be the property of a polymer like acrilic or polycarbonate to determine its effectiveness as an insulator or a dielectric? Volume resistivity? Tnx, Ted KX4OM On Fri, 18 Mar 2005 17:23:36 -0800, Roy Lewallen wrote: ---snip--- |
#7
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Ted Bruce wrote:
Roy, What wiould be the property of a polymer like acrilic or polycarbonate to determine its effectiveness as an insulator or a dielectric? Volume resistivity? Tnx, Ted KX4OM Volume resistivity is a useful measure only at DC. To determine a dielectric's lossiness at RF, look at the loss tangent, dissipation factor, or power factor. Loss tangent and dissipation factor are the same thing, and when loss is low, power factor is also the same for practical purposes. You'll find these in tables and descriptions of the electrical properties of insulators. Some searching will usually turn them up on the web if you don't have access to the appropriate reference books. Note that the loss properties are usually a function of frequency, so use the value at approximately the frequency of interest. In some situations, the capacitance of the dielectric can be important, such as when you're using it as a coil form or antenna covering. For that, look at the dielectric constant or relative permittivity (which are the same thing). This also changes somewhat with frequency. Roy Lewallen, W7EL |
#8
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Ed wrote:
Question: What is recommended to feed the ladderline through the particle board? Could I just drill and mount a couple #6 brass bolts with solder eyes on each side of the board and use it to connect ladder line, or is something else recommended? Will this have any measurable effect on efficiency? I use plexiglas instead of particle board. Banana plugs/sockets mounted on the plexiglas work for me. As a benefit, when the wind blows during a thunderstorm, the antenna unplugs itself. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#9
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I use plexiglas instead of particle board. Banana plugs/sockets
mounted on the plexiglas work for me. As a benefit, when the wind blows during a thunderstorm, the antenna unplugs itself. -- 73, Cecil http://www.qsl.net/w5dxp =============================== Cec, don't you feel disappointed you weren't struck by lightning after the storm drifts away? ---- Reg. |
#10
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Reg Edwards wrote:
Cec, don't you feel disappointed you weren't struck by lightning after the storm drifts away? To the best of my knowledge, the only thing around my house struck by lightning is a five foot tall live oak tree. With antennas, towers, telephone poles, birdhouses, and 40 foot tall trees all around, why did lightning choose to hit a five foot tall tree? Killed half of it but the other half is surviving. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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