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Author Topic: Suggestions for best coax  (Read 1808 times)
KB0TXC
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Posts: 80




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« on: September 07, 2013, 06:40:39 AM »

Hi,

As I have posted about previously, I am installing a 4BTV trap vertical. I have made good progress, and am working on the ground plane. The antenna is mounted as is the balun. However I need suggestions for coax. The total length needed is 110 feet. I am not using this for six Meters. I cannot afford that much hardline or heliax.

So what type of coax should I use to get the most bang for the buck?

Thanx again for the advice!

Best,

Joe KB0TXC
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W9GB
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Posts: 2659




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« Reply #1 on: September 07, 2013, 07:01:11 AM »

RG-213/U will be suitable for this coaxial cable run.
http://static.dxengineering.com/pdf/Belden%20RG213%20Date%208267.pdf
Every amateur radio store sells coax -- AES, HRO, Associated, Texas Towers, etc.

Davis RF (New Hampshire)
http://www.davisrf.com/coax.php

The Wireman (S. Carolina)
http://www.thewireman.com/coax.html

DX Engineering - coaxial cable (Ohio)
http://www.dxengineering.com/search/department/cable-and-connectors/part-type/coaxial-cable-bulk

Belden 8267 (RG-213/U) - HRO regularly stocks
http://www.belden.com/techdatas/metric/8267.pdf
HRO web page
http://www.hamradio.com/detail.cfm?pid=H0-004484
« Last Edit: September 07, 2013, 07:04:02 AM by W9GB » Logged
KB4QAA
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Posts: 2488




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« Reply #2 on: September 07, 2013, 01:28:19 PM »

http://vk1od.net/calc/tl/tllc.php

Use Owen's feedline loss calculator to see how each type performs.
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W2WDX
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Posts: 188




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« Reply #3 on: September 07, 2013, 02:06:39 PM »

So let's see ... 100' LMR-400 at 10 MHz with source end VSWR of 3

And Owens calculator says the line loss less .5 dB? That's less then the rated attenuation.

What am I missing? Should be much much higher.
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WH7DX
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Posts: 1029




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« Reply #4 on: September 07, 2013, 02:11:18 PM »

Hi,

As I have posted about previously, I am installing a 4BTV trap vertical. I have made good progress, and am working on the ground plane. The antenna is mounted as is the balun. However I need suggestions for coax. The total length needed is 110 feet. I am not using this for six Meters. I cannot afford that much hardline or heliax.

So what type of coax should I use to get the most bang for the buck?

Thanx again for the advice!

Best,

Joe KB0TXC

This stranded COAX.   Flexible enough to use.   Should last for a few decades.....   Very low loss.   

http://www.dxengineering.com/search/department/cable-and-connectors/part-type/coaxial-cable-bulk/product-line/dx-engineering-400max-low-loss-50-ohm-bulk-coaxial-cable?autoview=SKU
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KI4DSC
Member

Posts: 65




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« Reply #5 on: September 07, 2013, 04:17:25 PM »

So let's see ... 100' LMR-400 at 10 MHz with source end VSWR of 3

And Owens calculator says the line loss less .5 dB? That's less then the rated attenuation.

What am I missing? Should be much much higher.

I think you may be missing this line in the returned results * Note that estimating line loss from VSWR is prone to error.

If you have an antenna analyzer and use Zin (Z you get from your analyzer) you will get better results. 
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