Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
At 7/27/2007 03:17 PM, you wrote: After just getting through turning a set of Aerial Facilities Limited SC-220-2N Band Pass cans into a Band Pass Band Reject (tm) duplexer here is what I am going to share from my experiences. The Science Behind It: Please refere to US Patent #4080601 My Experiences: Please refere to: http://blog.myspace.com/index.cfm?fuseaction=blog.viewfriendID=85474861blogID=252104937http://blog.myspace.com/index.cfm?fuseaction=blog.viewfriendID=85474861blogID=252104937 http://blog.myspace.com/index.cfm?fuseaction=blog.viewfriendID=85474861blogID=286228333 http://blog.myspace.com/index.cfm?fuseaction=blog.viewfriendID=85474861blogID=289106710http://blog.myspace.com/index.cfm?fuseaction=blog.viewfriendID=85474861blogID=289106710 Be careful about using non-silver-plated coax in a duplex line, even if it is double-shielded. I've had that stuff cause intermittent desense after being in service for a couple of years, it was indoors. Bob NO6B
Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
I knew it was wrong, but I did it anyway. I couldn't find the piece I have that is silver plated at the time and I hate playing the mail order game. Hey, at least I didn't use 9913. Be careful about using non-silver-plated coax in a duplex line, even if it is double-shielded. I've had that stuff cause intermittent desense after being in service for a couple of years, it was indoors. Bob NO6B
Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
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? Bruce K7IJ In a message dated 7/30/2007 2:04:59 P.M. Pacific Daylight Time, [EMAIL PROTECTED] writes: I knew it was wrong, but I did it anyway. I couldn't find the piece I have that is silver plated at the time and I hate playing the mail order game. Hey, at least I didn't use 9913. Be careful about using non-silver-plated coax in a duplex line, even if it is double-shielded. I've had that stuff cause intermittent desense after being in service for a couple of years, it was indoors. Bob NO6B ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour
Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
BTW, It is actually surplus DOE 'RF-214'.
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
RE: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
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? Bruce K7IJ I have, with a 4-cavity 2m pass/reject Wacom duplexer. I was lazy and only replaced the cables going to the antenna tee, which eliminated the desense. I also had a really old Wacom 6-cavity 2m duplexer that used plain old RG8 solid. I shotgunned all of the cables on that one. UHF and 800+ Wacom duplexers that I'm familiar with all used RG142B/U or RG400 coax, not RG214 types, so I've never had to mess with those. --- Jeff
RE: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
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: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Bob Dengler Sent: Monday, July 30, 2007 5:33 PM To: Repeater-Builder@yahoogroups.com 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
Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
Do I need to call Lloyd again?? Steve NU5D Bob Dengler wrote: 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
Re: [Repeater-Builder] non-silver RG-214 was Lloyd is Well was Cable Lengths
Be my guest. Lloyd supplied double shielded copper cables. In a message dated 7/30/2007 5:58:37 P.M. Pacific Daylight Time, [EMAIL PROTECTED] writes: Do I need to call Lloyd again?? Steve NU5D Bob Dengler wrote: 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 ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour
