That tape shield is what causes LMR 400 to introduce noise into the system.
Heliax is made for tower runs. The jacket is thick plastic rather than rubber like plastic and is much more abrasion resistant. With the proper end connectors sealed properly there is no way for the water to get into this cable and so the salt can't get in either. When you crimp a connector onto standard coax you better make sure it's as resistant as possible to the elements because they are all getting in there. LMR 400 even with the factory installed connectors lets so much water in it's not funny. When we used to use LMR 400 in microwave applications if we would get a strong rain we would have at least one of them that would get water logged. Doesn't happen with properly installed heliax. The heliax connectors have rubber seals in them and if you seal up the connector to the antenna you will have a totally watertight seal that could be submerged and still not leak. Vern -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Rogers Sent: Monday, November 23, 2009 9:58 PM To: [email protected] Subject: Re: [Liveaboard] VHF ant problem Vern, This cable is not tinned nor does it brag about its resistance to the elements. The other cables woven shield is tinned with an inner aluminum tape shield while the center conductor is copper. This cable is copper shield with a copper clad aluminum center conductor. Doesn't sound as saltwater resistant. Ron -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Vernon Densler Sent: Monday, November 23, 2009 9:30 PM This is what I would use. http://www.rfparts.com/heliax_FSJ150A.html Not much bigger than regular coax. I am very partial to Andrew's Heliax. I noticed a big difference when changed my repeater over from LMR 400 to 1/2" heliax. This is actually what I have on my repeater to duplexer connections then the 1/2" going to the antenna from the duplexer. _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
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