Re: [Repeater-Builder] Re: LMR Cable
Eric, Most duplexers and multi-couplers that I have come across are from either Rx/Tx or Sinclair and all use the RG-214 with copper rather than silver plated conductors. You would think that if the difference was significant those guys would use the better of the two. Someone had suggested that small diameter LDF or FSJ be used as interconnecting cables for duplexers, multi-couplers and the like, but doesn't the weakest link in the chain principle apply? In other words, if even one piece of crap cable is used isn't it just as well as it all be crap-cable? Your comments about the RG-142 are interesting. I use a short jumper as a rotation loop because it IS so flexible and tolerant to low temps. But this is for HF so maybe the dandruff issue isn't as important? Thanks for chiming in on this. Interesting stuff! lh On Sun, Mar 7, 2010 at 6:47 PM, Eric Lemmon wb6...@verizon.net wrote: Larry, Real RG-214/U is genuine military specification cable, while un-real RG-214 is ersatz, make-believe crap that fails to meet many or all of the Mil-Spec requirements. Although such cable is supposed to have the work TYPE following the part number, there are dishonest vendors who omit that word and hope that the buyers are too focused on price to know that they're buying junk. That said, I will admit that some reputable cable manufacturers do offer a line of RG-214/U TYPE cable that is double-shielded with tinned or bare copper braids and center conductor, rather than silver-plated braids and silver-plated center conductor. Naturally, this cable costs much less than the silver-plated variety. I would never shop for cable based solely on price, but many people do. RG-142/U coaxial cable is good stuff, provided it will not be flexed after installation. RG-142/U is identical to RG-400/U, except that the former has a silver-plated solid steel center conductor, while the latter has a silver-plated stranded copper center conductor. I have attached the Military Specification for RG-214/U cable as an example. It is also posted in the Files section of this Group. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Larry Horlick Sent: Sunday, March 07, 2010 3:25 PM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: LMR Cable What is the difference between real and un-real RG214? And what is the problem with RG-142? lh On Sun, Mar 7, 2010 at 6:24 PM, NORM KNAPP nkn...@twowayradio.netnknapp%40twowayradio.net mailto:nkn...@twowayradio.net nknapp%40twowayradio.net wrote: Those are usually the preferred types of cables. You should have no problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 or RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good choice. Don't even think about any LMR type or similar. N5NPO Norm - Original Message - From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com Sent: Sun Mar 07 16:54:30 2010 Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi-couplers/combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo.comdan173mi%40yahoo.com mailto:dan173mi%40yahoo.com dan173mi%2540yahoo.com mailto: dan17...@yahoo.com dan173mi%40yahoo.com mailto:dan173mi%40yahoo.com dan173mi%2540yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.comwb2edv%40roadrunner.com mailto:wb2edv%40roadrunner.com wb2edv%2540roadrunner.com mailto: wb2...@roadrunner.com wb2edv%40roadrunner.com mailto:wb2edv%40roadrunner.com wb2edv%2540roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com wb2edv%40roadrunner.com mailto:wb2edv%40roadrunner.com wb2edv%2540roadrunner.com mailto: wb2...@roadrunner.com wb2edv%40roadrunner.com mailto:wb2edv%40roadrunner.com wb2edv%2540roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable
Re: [Repeater-Builder] Re: LMR Cable
On Mar 7, 2010, at 4:46 PM, Larry Horlick wrote: So in a duplex application, if the supply of the better cable is limited, it's better to use it on the rx side? I think other folks have said this as well, but the answer is... if the supply of the right kind of cable to do the job is limited, get the right cable. :-) PIM doesn't always hit YOUR receiver at a busy RF site. Installation of anything other than top-quality cables and connectors can become a nightmare for the guy in the cabinet down the row. In other words, If you don't have the money to do it right the first time, what makes you think you'll have the money to fix it the second time? ... as the old saw goes. (Been there, done that. Didn't appreciate the cheap people that didn't do a proper installation of their gear making their lack of funds MY technical problem.) There's a price to be paid for living at a high-RF multiple-transmitter site. That price includes using proper installation components. -- Nate Duehr, WY0X n...@natetech.com facebook.com/denverpilot twitter.com/denverpilot
Re: [Repeater-Builder] Re: LMR Cable
Passive Intermodulation. Things like rusty hardware or disimilar metals can cause it in the presence of RF. From: rffun radio...@her.forthnet.gr To: Repeater-Builder@yahoogroups.com Sent: Sun, March 7, 2010 2:33:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@yahoogroups.com, Larry Horlick llhorl...@... wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@... *To:* Repeater-Builder@yahoogroups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: LMR Cable
Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her.forthnet.gr To: Repeater-Builder@yahoogroups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@yahoogroups.com, Larry Horlick llhorl...@... wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@... *To:* Repeater-Builder@yahoogroups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr To: Repeater-Builder@ yahoogroups. com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com, Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
Any problems with RG-214 or RG223 for duplexers/multi-couplers/combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On *Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.com* wrote: From: Chuck Kelsey wb2...@roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. grhttp://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr To: Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com, Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
Those are usually the preferred types of cables. You should have no problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 or RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good choice. Don't even think about any LMR type or similar. N5NPO Norm - Original Message - From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Sun Mar 07 16:54:30 2010 Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi-couplers/combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo.com mailto:dan17...@yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.com mailto:wb2...@roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com mailto:wb2...@roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr To: Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
What is the difference between real and un-real RG214? And what is the problem with RG-142? lh On Sun, Mar 7, 2010 at 6:24 PM, NORM KNAPP nkn...@twowayradio.net wrote: Those are usually the preferred types of cables. You should have no problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 or RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good choice. Don't even think about any LMR type or similar. N5NPO Norm - Original Message - From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Sent: Sun Mar 07 16:54:30 2010 Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi-couplers/combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo.comdan173mi%40yahoo.commailto: dan17...@yahoo.com dan173mi%40yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.comwb2edv%40roadrunner.commailto: wb2...@roadrunner.com wb2edv%40roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com wb2edv%40roadrunner.commailto: wb2...@roadrunner.com wb2edv%40roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.commailto: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr To: Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
none i'm aware of. mil-spec rg-214 or 223 has silver-plated conductors. the best interconnect cable to use in my opinion would be a smaller diameter heliax such as FSJ1-50A if you can get away with it. Dan k8plw --- On Sun, 3/7/10, Larry Horlick llhorl...@gmail.com wrote: From: Larry Horlick llhorl...@gmail.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 5:54 PM Any problems with RG-214 or RG223 for duplexers/multi- couplers/ combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo. com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner. com wrote: From: Chuck Kelsey wb2...@roadrunner. com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@ yahoogroups. com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr To: Repeater-Builder@ yahoogroups. com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com, Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
Real as it refers to the original military-spec'd construction of the cable. Type meaning similar to original spec but likely not exact. common differences in Type cable might be tinned vs. silver plated conductors, dialectric material etc. Spec RG-142 has a silver-plated steel center conductor. repeated flexing can cause the thin plating to fracture off creating duplex noise. i've personally not had this problem but it is a documented issue. Dan k8plw --- On Sun, 3/7/10, Larry Horlick llhorl...@gmail.com wrote: From: Larry Horlick llhorl...@gmail.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 6:24 PM What is the difference between real and un-real RG214? And what is the problem with RG-142? lh On Sun, Mar 7, 2010 at 6:24 PM, NORM KNAPP nkn...@twowayradio. net wrote: Those are usually the preferred types of cables. You should have no problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 or RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good choice. Don't even think about any LMR type or similar. N5NPO Norm - Original Message - From: Repeater-Builder@ yahoogroups. com Repeater-Builder@ yahoogroups. com To: Repeater-Builder@ yahoogroups. com Repeater-Builder@ yahoogroups. com Sent: Sun Mar 07 16:54:30 2010 Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi- couplers/ combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo. com mailto:dan17...@yahoo. com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner. com mailto:wb2...@roadrunner. com wrote: From: Chuck Kelsey wb2...@roadrunner. com mailto:wb2...@roadrunner. com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@ yahoogroups. com mailto:Repeater-Builder@ yahoogroups. com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560. mail.yahoo. com/mc/compose? to=radiocom% 40her.forthnet. gr To: Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
So in a duplex application, if the supply of the better cable is limited, it's better to use it on the rx side? On Sun, Mar 7, 2010 at 6:42 PM, Dan Saputo dan17...@yahoo.com wrote: Real as it refers to the original military-spec'd construction of the cable. Type meaning similar to original spec but likely not exact. common differences in Type cable might be tinned vs. silver plated conductors, dialectric material etc. Spec RG-142 has a silver-plated steel center conductor. repeated flexing can cause the thin plating to fracture off creating duplex noise. i've personally not had this problem but it is a documented issue. Dan k8plw --- On *Sun, 3/7/10, Larry Horlick llhorl...@gmail.com* wrote: From: Larry Horlick llhorl...@gmail.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 6:24 PM What is the difference between real and un-real RG214? And what is the problem with RG-142? lh On Sun, Mar 7, 2010 at 6:24 PM, NORM KNAPP nkn...@twowayradio. nethttp://us.mc560.mail.yahoo.com/mc/compose?to=nkn...@twowayradio.net wrote: Those are usually the preferred types of cables. You should have no problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 or RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good choice. Don't even think about any LMR type or similar. N5NPO Norm - Original Message - From: Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.comRepeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com To: Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.comRepeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com Sent: Sun Mar 07 16:54:30 2010 Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi- couplers/ combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=dan173mi%40yahoo.commailto:dan17...@yahoo. com http://us.mc560.mail.yahoo.com/mc/compose?to=dan173mi%40yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.commailto:wb2...@roadrunner. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.commailto:wb2...@roadrunner. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.commailto:Repeater-Builder@ yahoogroups. comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560. mail.yahoo. com/mc/compose? to=radiocom% 40her.forthnet. grhttp://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr To: Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.comhttp://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.comhttp
Re: [Repeater-Builder] Re: LMR Cable
in a duplex environment high levels of rf are likely to be present in close proximity to all associated station hardware including interconnect cables so best not to take chances on cable/connector quality. holds true of both tx and rx cabling. Dan k8plw --- On Sun, 3/7/10, Larry Horlick llhorl...@gmail.com wrote: From: Larry Horlick llhorl...@gmail.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 6:46 PM So in a duplex application, if the supply of the better cable is limited, it's better to use it on the rx side? On Sun, Mar 7, 2010 at 6:42 PM, Dan Saputo dan17...@yahoo. com wrote: Real as it refers to the original military-spec'd construction of the cable. Type meaning similar to original spec but likely not exact. common differences in Type cable might be tinned vs. silver plated conductors, dialectric material etc. Spec RG-142 has a silver-plated steel center conductor. repeated flexing can cause the thin plating to fracture off creating duplex noise. i've personally not had this problem but it is a documented issue. Dan k8plw --- On Sun, 3/7/10, Larry Horlick llhorl...@gmail. com wrote: From: Larry Horlick llhorl...@gmail. com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@ yahoogroups. com Date: Sunday, March 7, 2010, 6:24 PM What is the difference between real and un-real RG214? And what is the problem with RG-142? lh On Sun, Mar 7, 2010 at 6:24 PM, NORM KNAPP nkn...@twowayradio. net wrote: Those are usually the preferred types of cables. You should have no problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 or RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good choice. Don't even think about any LMR type or similar. N5NPO Norm - Original Message - From: Repeater-Builder@ yahoogroups. com Repeater-Builder@ yahoogroups. com To: Repeater-Builder@ yahoogroups. com Repeater-Builder@ yahoogroups. com Sent: Sun Mar 07 16:54:30 2010 Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi- couplers/ combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo. com mailto:dan17...@yahoo. com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner. com mailto:wb2...@roadrunner. com wrote: From: Chuck Kelsey wb2...@roadrunner. com mailto:wb2...@roadrunner. com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@ yahoogroups. com mailto:Repeater-Builder@ yahoogroups. com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560. mail.yahoo. com/mc/compose? to=radiocom% 40her.forthnet. gr To: Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560. mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog roups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG
RE: [Repeater-Builder] Re: LMR Cable
Nope. Both braids are silver-plated, so there's no dissimilar metals, and no foil to rub against. RG-214/U and RG-400/U are often specified for duplexers. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Sunday, March 07, 2010 2:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi-couplers/combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo.com mailto:dan17...@yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.com mailto:wb2...@roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com mailto:wb2...@roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr To: Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups .com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups .com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups .com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR Cable
I believe that the real problem is that the center conductor is solid. A slight nick in it will eventually cause it to break due to cable flexing fatigue at the weak point. RG-400 is often used instead and has a stranded center conductor. Chuck WB2EDV - Original Message - Spec RG-142 has a silver-plated steel center conductor. repeated flexing can cause the thin plating to fracture off creating duplex noise. i've personally not had this problem but it is a documented issue.
RE: [Repeater-Builder] Re: LMR Cable
What is the difference between real and un-real RG214? There are some non-mil-spec RG214 varients out there. Sometimes they are labeled as RG214 TYPE, or RG214 Commercial. These typically have double braid like real RG214, but unlike real RG214, the braids are bare copper instead of silver-plated. Bare copper braid gets noisy as it ages, as the oxide layer formed on the braid strands isn't a good conductor, unlike silver which, even when oxidizes, is still a fairly good conductor. Wacom was one of the bigger companies that used RG214 TYPE cables in their VHF duplexers, at least for a while. Has caused me substantial grief. Most of their UHF/800/900 products used RG-400. And what is the problem with RG-142? RG-142B/U has a center conductor that is copper-clad steel with a silver top plating. The potential problem with RG-142B/U is that the steel center conductor can break due to repeated flexing. This isn't a problem in fixed installations, but can be a problem if you're using it as a test cable or in other situations where it's subject to repeated flexing. The most important thing to do is make sure you don't knick the center conductor when removing the dielectric when installing connectors as that greatly increases the chance of it breaking. But, I have to say in many years and hundreds (thousands?) of feet of use, I've never had it happen to me personally, but then again, I only use it for fixed installations. For test cables, use RG-400, which is virtually identical to RG-142B/U, except the center conductor is stranded so it handles flexing better. Good cables for repeater installations (assuming they're mil-spec or otherwise not some kind of a knock-off varient) in order of increasing diameter include: RG-142B/U, RG-400, RG-223, RG-393, RG-214, and any Heliax-type cable with a solid copper shield. Cables to avoid: anything with a bare copper braid (even if double-shielded), any cable with foil+braid shield, anything that isn't double-shielded or solid-shielded. --- Jeff WN3A
RE: [Repeater-Builder] Re: LMR Cable
Oops! I should have added that RG-223/U cable is also double-shielded with silver-plated braids, and has a solid copper center conductor that is silver-plated. It has a PVC jacket and solid polyethylene dielectric. The Mil-Spec data sheet for this cable is also posted in the Files section of this Group. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Sunday, March 07, 2010 3:05 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: LMR Cable Nope. Both braids are silver-plated, so there's no dissimilar metals, and no foil to rub against. RG-214/U and RG-400/U are often specified for duplexers. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Larry Horlick Sent: Sunday, March 07, 2010 2:55 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: LMR Cable Any problems with RG-214 or RG223 for duplexers/multi-couplers/combiners? lh On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo dan17...@yahoo.com mailto:dan173mi%40yahoo.com mailto:dan17...@yahoo.com mailto:dan173mi%40yahoo.com wrote: well-documented and caused mainly by the use of foil shielding as in the lmr series. gets worse as cable ages and internal braid-foil contact degrades. Although not as big of a problem with lmr due to an insulating layer over the actual foil. beware of belden 9913 and lmr look-alikes. trouble when used duplex. Dan k8plw --- On Sun, 3/7/10, Chuck Kelsey wb2...@roadrunner.com mailto:wb2edv%40roadrunner.com mailto:wb2...@roadrunner.com mailto:wb2edv%40roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com mailto:wb2edv%40roadrunner.com mailto:wb2...@roadrunner.com mailto:wb2edv%40roadrunner.com Subject: Re: [Repeater-Builder] Re: LMR Cable To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Date: Sunday, March 7, 2010, 4:56 PM Passive Intermod. In other words, it tends to be a source in which intermod can be generated easily. Chuck WB2EDV - Original Message - From: rffun radio...@her. forthnet. gr http://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr http://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr To: Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups .com Sent: Sunday, March 07, 2010 3:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups .com , Larry Horlick llhorl...@. .. wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@. .. *To:* Repeater-Builder@ yahoogroups. com http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups .com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry - - -- Yahoo! Groups Links - - - - - - No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 02:34:00
Re: [Repeater-Builder] Re: LMR cable
Yes, that was my point. Many of these cables do not experience flexing or weather changes, yet exhibit the problems anyway. Chuck - Original Message - From: Laryn Lohman [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thursday, May 24, 2007 7:45 AM Subject: [Repeater-Builder] Re: LMR cable --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey [EMAIL PROTECTED] wrote: Whoops. Should have said no movement and I should have changed the subject line. Chuck And I wonder how many of these no movement scenarios actually suffer from slowly decreasing sensitivity in their receivers, caused by the thousands of diodes in these cables producing a slow increase in white noise as the cables degrade. Laryn K8TVZ Yahoo! Groups Links
Re: [Repeater-Builder] Re: LMR cable Q:
Motorola also put out a white paper on braid-over-foil cable and pointed out it's problems in a duplexed system. They did not specifically name LMR cable, but it was obvious that they were talking about it and others. Joe At 10:48 PM 1/29/2007 +, you wrote: Andrew has a technical paper that compares Heliax to braid-foil cables at: http://www.andrew.com/search/BN_SP30-27.aspxhttp://www.andrew.com/search/BN_SP30-27.aspx
Re: [Repeater-Builder] Re: LMR cable Q:
ok, what's the paper called? Is it posted on MOL? If so, what folder is it in? Gary Joe wrote: Motorola also put out a white paper on braid-over-foil cable and pointed out it's problems in a duplexed system. They did not specifically name LMR cable, but it was obvious that they were talking about it and others. Joe At 10:48 PM 1/29/2007 +, you wrote: Andrew has a technical paper that compares Heliax to braid-foil cables at: http://www.andrew.com/search/BN_SP30-27.aspx
