Someone passed me this link: http://www.qsl.net/co8tw/Coax_Calculator.htm and as long as we are talking coax: I have some RG-8 which is Belden 9913F7. They tell me that this can be considered 'Hollow core' because of a spiral winding about the center conductor, and that special caution must then be taken with PL-259 ends. Pardon me if I previously answered 'no' to the 'hollow' question, the next paragraph explains why. The RG-8(U) designation means that it has properties similar to LMR-400, yet the above description makes it different at installation time.
My previous experience was with 1/2 & larger heliax, which in some cases, has a 'hollow center' about it with occasional ceramic spacers. Others have a 'stiff foam'. In either event, the properties of heliax cable involve less loss due to the fact that it is, in effect, a flexible waveguide. There are good reasons to use this above VHF frequencies. It should be realized that a 'jumper' of more flexible coax is often used near rotators, with a minor connector loss. Newer 'ultraflex' heliax may take much more movement- yet for how long? Most of the heliax costs far more than regular coaxial cable unless one gets small rolls as surplus and 'hamfest buys' on the connectors. For a longer run, 1/2" heliax would be ideal- if price were within budget. 73 de KB0MNM ----- Original Message ----- From: "SETX Telecom via BVARC" <bvarc@bvarc.org> To: "BRAZOS VALLEY AMATEUR RADIO CLUB" <bvarc@bvarc.org> Cc: "SETX Telecom" <setxtele...@gmail.com> Sent: Wednesday, August 9, 2017 6:04:57 PM Subject: Re: [BVARC] Coax cable question I would not use 8X for any feedline..not bad for a double bazooka antenna though lol I prefer Heliax myself...the superflex type is great for a lot of things..and can bend a lot better than regular Heliax...with better loss than LMR and no shield movement noise ..which really is a pain in duplex/rptr use Chris WB5ITT On Aug 9, 2017 4:23 PM, "Gayle Dotts via BVARC" < bvarc@bvarc.org > wrote: So bottom line..... yes! For a little bit more in financial expense on the LMR400 cable from RG8x you will noticeably benefit in increased receiving ability as well as transmiting from the upgrade. thanks. On Wed, Aug 9, 2017 at 11:55 AM, Gayle Dotts < gayle.do...@gmail.com > wrote: <blockquote> For use in HF at 28.000 Mhz frequency, length 75-100 feet, is LMR400 cable worth it for better RX/TX attenuation? _______________________________________________ BVARC mailing list BVARC@bvarc.org http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to setxtele...@gmail.com </blockquote> _______________________________________________ BVARC mailing list BVARC@bvarc.org http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to jkli...@comcast.net
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