RG-9 coax is a really old design, circa WW2 I looked at the 1946 issue of JAN-C-17A and found the spec sheets for both RG-9/U and RG-9A/U, which are different. The RG-9/U has one silver-plated shield and one bare copper shield, while the RG-9A/U has two silver-plated shields. I noticed that the shield braids are different as well, with disparate numbers of ends and picks per inch. Since they're small in size, I have attached the two spec sheets as PDF files.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of NORM KNAPP Sent: Monday, August 03, 2009 9:44 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Possible desense issue, any thoughts Very interesting. I looked up the specs for Belden 8242 RG-9/U. I have a 6 foot piece with N type males on each end and I use it as a test jumper... According to Belden, the center conductor and the inside shield are silver plated copper. However the outer shield is bare copper. What gives??? Why would they make such a product? What spec would call for the shields to be like that and why? Anyone? 73 de N5NPO Norman Knapp P. S. I stand corrected. I would not recomend RG-9/U. :However, RG-223/U would work.... Right? ----- Original Message ----- From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> <Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> <Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > Sent: Mon Aug 03 21:38:22 2009 Subject: Re: [Repeater-Builder] Possible desense issue, any thoughts At 8/3/2009 14:42, you wrote: >Or RG-9/U. > >Norm N5NPO I think most RG-9/U has copper braid, & is unsuitable for use in any duplexed portion of a repeater system (from the duplexer T to the antenna). Should be OK for RX & TX interconnects though. Bob NO6B <snip>
