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Author Topic: Need advice on Co-ax  (Read 457 times)
KA7YUH
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Posts: 4




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« on: April 02, 2006, 09:23:32 AM »

I recently moved and now going to install an all band trapped di-pole. It will be about 100' from center coil to rig in shack. What in your opinion is absolutely the best co-ax to use?
Thanks,
Ed KA7YUH
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AA4PB
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Posts: 12854




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« Reply #1 on: April 02, 2006, 03:18:28 PM »

Depends on what you mean by "best". The lowest loss will be 7/8-inch hard line. Assuming by all band you mean 80-10M, if you want something more realistic use RG-213. You could even do pretty well with RG-8X.
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WB2WIK
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« Reply #2 on: April 03, 2006, 01:58:54 PM »

>Need advice on Co-ax  Reply  
by KA7YUH on April 2, 2006  Mail this to a friend!  
I recently moved and now going to install an all band trapped di-pole.<

::It's "dipole."

>It will be about 100' from center coil to rig in shack. What in your opinion is absolutely the best co-ax to use?<

::It's "coax."

For 100' of coax on the HF bands (up to 30 MHz), conventional RG-213/U is a very good choice.  The coax will weigh 10 lbs and catch some wind, so the "wind loading" from the coax, pulling down on the center of the dipole, will be 10 lbs minimum and considerably more than that maximum (depends on the wind), and this might exceed the strength of the dipole, or its center insulators, or end insulators, or end ropes.  So, choosing the coax for a self-supporting wire dipole is a compromise between loss and power handling vs. weight.  That's the reason a lot of people use RG8X "mini-8" instead: It has only slightly higher loss, slightly lower power rating, and less than half the weight.

If the dipole's an inverted vee with a center support, so the weight of the coax isn't loading down the antenna, then of course you can use the lowest loss, highest power rated coax you wish!

WB2WIK/6
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G0GQK
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Posts: 634




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« Reply #3 on: April 17, 2006, 01:15:50 PM »

Sorry to have to disagree with you old chap but the correct name is co-axial cable, even in America.
After all said and done, it was invented in America.

Mel G0GQK
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KO1D
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Posts: 387




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« Reply #4 on: April 29, 2006, 04:31:17 PM »

Well if you must go with coax do that, but consider open wire feedlines. High impedence but very VERY low loss.

Dan S.
KO1D
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