RE: [Repeater-Builder] Coax run
Don't use 9913 in any repeater setting. Either find some RG142 or use hardline of some sort. LMR400 is not even a good choice. This I can affirm to very quickly. The shortest route is what I took for my jumpers. Mathew -Original Message- From: n2odw [mailto:[EMAIL PROTECTED] Sent: Wednesday, April 13, 2005 6:05 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Coax run Hello to the group I have a question concerning the coax run from the duplexer to the repeater. I am also using the GM300's as transmitter and receiver. How long should I cut the cables for? And is it alright to use the 9914 as those jumpers? My repeater frequncey is 443.025 with a positive offset. Will / W4WWM Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Coax run
Dave VanHorn wrote: At 06:38 PM 4/13/2005, Mathew Quaife wrote: Don't use 9913 in any repeater setting. Would be helpful to state reasons, rather than blunt assertions. It's kind of like software, I don't want to see comments that tell me what the code is doing, I want to know WHY it's being done this way, and not some other way. Maybe you are new to the list. This topic has been discussed in detail (even just recently) and it has been shown time after time that the dissimilar metals (tined copper braid, over an aluminum foil) will eventually cause noise in a duplex environment. Either find some RG142 or use hardline of some sort. I've had RG-213 recommended to me, as well as hardlines. The trend seems to be twoard double braid shields, and away from foil, and twoard stranded copper center conductors, and away from copper plated aluminum, which has problems if you nick the copper. RG-213 is nothing more than RG-8, it's single braid. RG-214 Mil Spec (and yes it has to be mil spec to insure silver plating) is a very good choice for repeater cabling, especially of the transmitter. RG-400 or RG-142 are good choices for lower power or receiver connections. LMR400 is not even a good choice. This I can affirm to very quickly. The shortest route is what I took for my jumpers. I checked with Joe Lanoue, the product manager at Times microwave, he says the following: "On LMR the mechanism for the PIM is actually the contact between the aluminum tape and the inside of the connector body into which it goes. I disagree. It's the tin braid over aluminum foil that is the problem. The silver plated shield on TCOM and lack of aluminum tape inside the connector body negate the situation. " Could very well be. At least Times finally affirms there is a problem with LMR, something that I have claimed for a long time. Search the archives for more on the subject. Kevin Custer Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Coax run
Maybe you are new to the list. This topic has been discussed in detail (even just recently) and it has been shown time after time that the dissimilar metals (tined copper braid, over an aluminum foil) will eventually cause noise in a duplex environment. Relatively new yes, but then new people come on all the time. This guy may be newer than me, and searching yahoo's archives is a PITA. At least Times finally affirms there is a problem with LMR, something that I have claimed for a long time. Search the archives for more on the subject. I'm not too surprised by this, it's not that dis-similar from BeldFoil, which was a disaster. Thicker aluminum, but the surface will all be oxidized, and any motion at all will cause scraping, and intermittent contact. If it was in an oxygen free atmosphere, I suspect it would be ok, but who could afford that? Friendly vs unfriendly metals makes a difference too. Gold Vs Tin with resultant fretting of the tin, is something I've recently seen up close. Very nasty. Fortunately, a shot of De-Oxit helps a lot. Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Coax run
A few things. RG-213 is single shield RG-8 coax so that would not be good. Keep in mind that Times is selling coax. It is not as much the shielding but the fact that the shield and the foil move and cause noise in your system. It has been talked about time and time again here on RP. Good luck, Russ, W3CH. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Coax run
Dave VanHorn wrote: I wrote: Maybe you are new to the list. This topic has been discussed in detail (even just recently) and it has been shown time after time that the dissimilar metals (tined copper braid, over an aluminum foil) will eventually cause noise in a duplex environment. Relatively new yes, but then new people come on all the time. I know, I own the list. This guy may be newer than me No, he's a long time subscriber. and searching yahoo's archives is a PITA. I agree, but we have a fix in place for that: http://www.mail-archive.com/repeater-builder@yahoogroups.com/ Kevin Custer Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Coax run
The main qeustion is not about what type of coax to use but the length of the transmission line between the duplexers and the repeater. Yes I am about a 3 weeks into the group new. Thanks Will Russ Stafford wrote: A few things. RG-213 is single shield RG-8 coax so that would not be good. Keep in mind that Times is selling coax. It is not as much the shielding but the fact that the shield and the foil move and cause noise in your system. It has been talked about time and time again here on RP. Good luck, Russ, W3CH. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Coax run
Will Wright wrote: The main question is not about what type of coax to use but the length of the transmission line between the duplexers and the repeater. May I point you to an archived reply on the subject: http://www.mail-archive.com/repeater-builder@yahoogroups.com/msg15725.html Kevin Custer Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
