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Sorry, but my numbers are going to be off then. I thought you said your RG-8x was 82%vf, so yeah, if it is 78%, then the length will be shorter.

I believe Times Microwave LMR400 has a 85% VF. I know the imitation stuff I use is also 85%. So, again, if it is 84%, the lengths will be a little shorter. But remember, these are just factory specs. Your analyzer will be able to give you a much more accurate VF for that particular piece/brand of coax. Just use a measured piece ~20% longer than what you will need (~72'). Get an accurate determination of the VF, plug that number into the equation, determine the 2 wavelength distance, cut the coax to length.

I use the calculator found at the bottom of the page here:
https://ac6la.com/tldetails1.html

TL Details. You can DL it and run the .exe on your PC. It allows you to pick common coax types but also change the numbers/settings. You can even create a custom coax, if yours isn't listed.

<blockquote data-quote="Dr_DX" data-source="post: 746217" data-attributes="member: 1260">Sorry, but my numbers are going to be off then.&nbsp; I thought you said your RG-8x was 82%vf, so yeah, if it is 78%, then the length will be shorter.I believe Times Microwave LMR400 has a 85% VF.&nbsp; I know the imitation stuff I use is also 85%.&nbsp; So, again, if it is 84%, the lengths will be a little shorter.&nbsp; But remember, these are just factory specs.&nbsp; Your analyzer will be able to give you a much more accurate VF for that particular piece/brand of coax.&nbsp; Just use a measured piece ~20% longer than what you will need (~72&#039;).&nbsp; Get an accurate determination of the VF, plug that number into the equation, determine the 2 wavelength distance, cut the coax to length.I use the calculator found at the bottom of the page here:<a href="https://ac6la.com/tldetails1.html" target="_blank">https://ac6la.com/tldetails1.html</a>TL Details.&nbsp; You can DL it and run the .exe on your PC.&nbsp; It allows you to pick common coax types but also change the numbers/settings.&nbsp; You can even create a custom coax, if yours isn&#039;t listed.</blockquote>

[QUOTE="Dr_DX, post: 746217, member: 1260"] Sorry, but my numbers are going to be off then. I thought you said your RG-8x was 82%vf, so yeah, if it is 78%, then the length will be shorter. I believe Times Microwave LMR400 has a 85% VF. I know the imitation stuff I use is also 85%. So, again, if it is 84%, the lengths will be a little shorter. But remember, these are just factory specs. Your analyzer will be able to give you a much more accurate VF for that particular piece/brand of coax. Just use a measured piece ~20% longer than what you will need (~72'). Get an accurate determination of the VF, plug that number into the equation, determine the 2 wavelength distance, cut the coax to length. I use the calculator found at the bottom of the page here: [URL]https://ac6la.com/tldetails1.html[/URL] TL Details. You can DL it and run the .exe on your PC. It allows you to pick common coax types but also change the numbers/settings. You can even create a custom coax, if yours isn't listed. [/QUOTE]

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