Best base antenna coax

[543_Dallas]

I like the lmr400 for anything that doesn't move and is a lengthy run. For jumpers I use something flexible like mini 8 or 213.

Here's something to help you decide if you're getting your money's worth from better coax.
http://www.qsl.net/co8tw/Coax_Calculator.htm

 

[Heavy Metal]

I like the lmr400 for anything that doesn't move and is a lengthy run. For jumpers I use something flexible like mini 8 or 213.

Here's something to help you decide if you're getting your money's worth from better coax.
http://www.qsl.net/co8tw/Coax_Calculator.htm

I thought your not suppose to mix and match cables, jumpers and all suppose to be same?

 

[Road Squawker]

I thought your not suppose to mix and match cables, jumpers and all suppose to be same?

its done all the time.

https://www.google.com/url?sa=t&rct...g.html&usg=AFQjCNG8X2BV9ML4lgacZgWKuVl1emX16Q

 

[543_Dallas]

I thought your not suppose to mix and match cables, jumpers and all suppose to be same?

Nope. Just needs to be 50 ohm coax.

 

[Heavy Metal]

Ok, I thought mixing was not good, also some say that you only need enough to hook one piece of another aka radio to amp to tuner to meter to antenna? Some say 3' some 6' some 9' in increments of 3'? What's real vs myth.


If you do the math theirs no general solution each band is its own legnth, now what's proper legnth when comes to multiple bands 17/15/12/10 or 75/80 or 40/30/20? Or any combo their of or Broad band solution 12-10m or 17-15m ect ect for jumpers to keep total legnth at propert freq measurements?


Take CB well use 27Mhz comes to 9.1111112' for quarter wave using 492/freq now using height @52' for wave length using 468/27( 17.3333333 ) or is it 492/f which then would be 18.2222222

 

[543_Dallas]

Ok, I thought mixing was not good, also some say that you only need enough to hook one piece of another aka radio to amp to tuner to meter to antenna? Some say 3' some 6' some 9' in increments of 3'? What's real vs myth.


If you do the math theirs no general solution each band is its own legnth, now what's proper legnth when comes to multiple bands 17/15/12/10 or 75/80 or 40/30/20? Or any combo their of or Broad band solution 12-10m or 17-15m ect ect for jumpers to keep total legnth at propert freq measurements?


Take CB well use 27Mhz comes to 9.1111112' for quarter wave using 492/freq now using height @52' for wave length using 468/27( 17.3333333 ) or is it 492/f which then would be 18.2222222

For connecting a radio to a single antenna the proper length is whatever you need to reach. Certain issues can be hidden with certain lengths of coax and length does matter if if you're trying to set up phased antennas.

If you are seeing more than a minor SWR change with different coax lengths you have some other issues to work out. The subject of coax length in CB radio is full of myths and truth.

 

[Heavy Metal]

Actually run lmr400 and main is rg8x...


Back in 70's use to run radio shack top of line RG8/U never had swr probs was just wondering. Now I use 9' jumpers think maybe too long should have done 3' but that's here or there now... Thought of cutting in half and making 4.5' jumpers but unsure if that's a good idea or not.

 

[Heavy Metal]

http://audiosystemsgroup.com/Coax-Stubs.pdf

 

[Road Squawker]

Nope. Just needs to be 50 ohm coax.

see post 33 linky

 

[543_Dallas]

see post 33 linky

Sorry, I didn't know I needed to elaborate. There's always a a situation that something other than 50 ohm coax works better but that's a different topic. We're talking about CB radios with a 50 ohm output and CB antennas with a matching device that is intended to present a 50 ohm load. Under these circumstances you need to be using 50 ohm coax and may use any 50 ohm coax for jumpers. Be sure to refer to the coax specs and consider the loss and power rating of the cable.