Although Bob and I sometimes disagree on the fine points, I hafta say that silver-braided RG-214 is called for here. Geez, what are we talking about- perhaps five feet of silver-braid coax, maybe a few bucks?
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Dengler Sent: Monday, July 30, 2007 5:33 PM To: [email protected] Subject: Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths At 7/30/2007 02:21 PM, you wrote: >Bob > >That doesn't square with the large body of repeater owners who have used >Wacom cavities. Their UHF products used RG-142. However, their VHF >products used a proprietary cable which had: "MODIFIED RG-214 DOUBLE >SHIELDED" which was nothing more or less than RG-214 without silver >plating. Despite anecdotal experiences like yours, I've never heard a >complaint from anyone who used that Wacom modified cable regarding >desense. Have you? I can't speak w.r.t. the interconnecting cables on a duplexer. However, any braided cable that carries full duplex signals where there is a ratio of over 170 dB between the TX & RX signal levels needs to be silver plated, or sooner or later it generates IMD that results in (among other things) TX noise being intermittently mixed with the TX carrier onto the RX frequency. Perhaps the actual TX to RX signal ratios within the duplexer cable harness are less, which would explain why copper-braided coax works OK there. I just wouldn't use it anywhere between the antenna & duplexer. Bob NO6B
