Help with installing an Antenna, or just choosing the right antenna to go with your radio, or your mobile.
Moderator: JR Moderator
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- Joined: Wednesday, 11 January 2017, 13:27 PM
- Radio: DX2517 & Mark IV
- Antenna: IMAX 2000/Maco Comet
- Name: Rod Eagan
- Location: Northeastern Kentucky
Bought a beam from an individual and it has about 100 ft of RG8 coax attached, which is about 60ft more than I need. I was told by the previous owner not to shorten it because it would change the SWR. Is this true?
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- Location: NW PA
If coax length changes SWR, then you have other issues with the antenna system's tuning. Changing coax length can make you see a different reading on an SWR meter, but it's simply a band-aid, not a cure. Coax length is just another 11 Meter Myth.
Base: Galaxy DX2517, D104 Silver Eagle w/W2ENY element, SB 220, Imax 2000, 4 element quad
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- Radio: Realistic Navajo 457
- Name: Paul
- Location: Nova Scotia, Canada
There is a pretty good chance you will see a change in SWR just by swapping the entire setup from his place to yours. There are a lot of factors that can affect what you see on a meter. Just put it up with the cable you need and tune for best performance at your location.
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- Radio: Uniden Washington
- Antenna: Avanti Sigma II
- Name: Greg
- Location: Baltimore, MD
Like the others said, coax shouldn't change the SWR but you will probably be taking the antenna apart to transport it to your house. If you don't have a manual to put it back together you can most likely find it on the antenna manufacturer's website or CB Tricks. I would take a real good look at the old coax and since you only need half buy a new 50ft length, would be better off with new to start out fresh.
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