Re: [Repeater-Builder] Re: LMR-1200
2 additional connectors and a jumper at the antenna is still a potential source of trouble in the future, especially for someone who may not be familiar with how to install them properly. LDF4-50A is used extensively and almost exclusively in the cellular business for antenna jumpers. Joe -- Original message -- From: [EMAIL PROTECTED] Good N connectors are virtually lossless @ 450 MHz, 4 ft. of RG-214 (2 ft. each jumper) has 0.2 dB loss. I know there's a difference of opinion on this subject, but I'd never directly connect LDF4-50 to an antenna. ---BeginMessage--- At 1/27/2007 06:47, you wrote: LMR-1200 has about .9dB loss for 100 feet LDF4-50A has about 1.45dB loss for 100 feet At first glance, it looks like you can gain a little more than 1/2dB by using LMR-1200. Now. the real world. LMR-1200 will require a jumper at the top and the bottom of the cable run. (It's too big to connect directly to the antenna or the duplexer at the bottom). This means that you will have to have 4 additional connectors and 2 short lengths of jumper cable when using LMR-1200. This will add up to much more loss than the 1/2dB you saved by using LMR-1200. Good N connectors are virtually lossless @ 450 MHz, 4 ft. of RG-214 (2 ft. each jumper) has 0.2 dB loss. I know there's a difference of opinion on this subject, but I'd never directly connect LDF4-50 to an antenna. However, the real reason not to use LMR-1200 in duplex feeds is the braid-over-foil shield, which will eventually cause desense IMD. The key word is eventually: maybe 6 months after install, maybe 30 years. Nothing like solid copper to keep those stray electrons in line ;) Bob NO6B ---End Message---
[Repeater-Builder] Re: LMR-1200
Maybe I missed it, but I have 2 questions: 1) Are you going to use this for a repeater? 2) What frequency(s) are you going to be using? Joe --- In Repeater-Builder@yahoogroups.com, Dan Blasberg [EMAIL PROTECTED] wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline. Thanks, Dan KA8YPY
Re: [Repeater-Builder] Re: LMR-1200
Joe, 1) I would like to, yes. 2) 442.500/447.500 Dan On Jan 27, 2007, at 8:00 AM, Joe wrote: Maybe I missed it, but I have 2 questions: 1) Are you going to use this for a repeater? 2) What frequency(s) are you going to be using? Joe --- In Repeater-Builder@yahoogroups.com, Dan Blasberg [EMAIL PROTECTED] wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline. Thanks, Dan KA8YPY Yahoo! Groups Links
Re: [Repeater-Builder] Re: LMR-1200
LMR-1200 has about .9dB loss for 100 feet LDF4-50A has about 1.45dB loss for 100 feet At first glance, it looks like you can gain a little more than 1/2dB by using LMR-1200. Now. the real world. LMR-1200 will require a jumper at the top and the bottom of the cable run. (It's too big to connect directly to the antenna or the duplexer at the bottom). This means that you will have to have 4 additional connectors and 2 short lengths of jumper cable when using LMR-1200. This will add up to much more loss than the 1/2dB you saved by using LMR-1200. Also, LDF connectors are much easier to install than LMR connectors. Cheaper too. Pulling 100 feet of LMR cable up a tower can be difficult too. LDF is much easier to install and hardware, such as connectors, ground kits, snap-in hangers, are easier to find. 73, Joe, K1ike -- Original message -- From: Dan Blasberg [EMAIL PROTECTED] Joe, 1) I would like to, yes. 2) 442.500/447.500 Dan On Jan 27, 2007, at 8:00 AM, Joe wrote: Maybe I missed it, but I have 2 questions: 1) Are you going to use this for a repeater? 2) What frequency(s) are you going to be using? Joe --- In Repeater-Builder@yahoogroups.com, Dan Blasberg [EMAIL PROTECTED] wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline. Thanks, Dan KA8YPY Yahoo! Groups Links ---BeginMessage--- Joe, 1) I would like to, yes. 2) 442.500/447.500 Dan On Jan 27, 2007, at 8:00 AM, Joe wrote: Maybe I missed it, but I have 2 questions: 1) Are you going to use this for a repeater? 2) What frequency(s) are you going to be using? Joe --- In Repeater-Builder@yahoogroups.com, Dan Blasberg [EMAIL PROTECTED] wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline. Thanks, Dan KA8YPY Yahoo! Groups Links ---End Message---
Re: [Repeater-Builder] Re: LMR-1200
At 1/27/2007 06:47, you wrote: LMR-1200 has about .9dB loss for 100 feet LDF4-50A has about 1.45dB loss for 100 feet At first glance, it looks like you can gain a little more than 1/2dB by using LMR-1200. Now. the real world. LMR-1200 will require a jumper at the top and the bottom of the cable run. (It's too big to connect directly to the antenna or the duplexer at the bottom). This means that you will have to have 4 additional connectors and 2 short lengths of jumper cable when using LMR-1200. This will add up to much more loss than the 1/2dB you saved by using LMR-1200. Good N connectors are virtually lossless @ 450 MHz, 4 ft. of RG-214 (2 ft. each jumper) has 0.2 dB loss. I know there's a difference of opinion on this subject, but I'd never directly connect LDF4-50 to an antenna. However, the real reason not to use LMR-1200 in duplex feeds is the braid-over-foil shield, which will eventually cause desense IMD. The key word is eventually: maybe 6 months after install, maybe 30 years. Nothing like solid copper to keep those stray electrons in line ;) Bob NO6B
[Repeater-Builder] Re: LMR-1200
Yeah, a lot of you probably noticed I'm keeping quiet of this post. He said the price was free... if its the only boat in your harbour you probably take it for a ride. All my LMR cable problems have been with LMR-400 and 600 type cables. ... and lots of them so as you all know I don't like or use the LMR type cable anymore. cheers, skipp --- In Repeater-Builder@yahoogroups.com, Jim B. [EMAIL PROTECTED] wrote: Won't that still suffer from the foil/braid noise problem in duplex? I swear the LMR-1200 I saw had two braids and a foil shield... it's been a while though, and LMR cables were very new. -- Jim Barbour WD8CHL STeve Andre' wrote: On Tuesday 23 January 2007 13:13, Dan Blasberg wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline.
Re: [Repeater-Builder] Re: LMR-1200
Skipp and Jim, LMR-1200 is a hardline (I think), unlike 400 and 600, and is approximately 1 7/8. I am familiar with the foil/braid issues of 400 and 600, but have not had a chance to look at/play with 1200. So any and all comments are welcomed and appreciated. I do have access to several lengths of LDF-4 (??), that I was going to use and still may. Just wanted opinions/knowledge on the LMR-1200. Thanks, Dan KA8YPY On Jan 26, 2007, at 1:00 PM, skipp025 wrote: Yeah, a lot of you probably noticed I'm keeping quiet of this post. He said the price was free... if its the only boat in your harbour you probably take it for a ride. All my LMR cable problems have been with LMR-400 and 600 type cables. ... and lots of them so as you all know I don't like or use the LMR type cable anymore. cheers, skipp --- In Repeater-Builder@yahoogroups.com, Jim B. [EMAIL PROTECTED] wrote: Won't that still suffer from the foil/braid noise problem in duplex? I swear the LMR-1200 I saw had two braids and a foil shield... it's been a while though, and LMR cables were very new. -- Jim Barbour WD8CHL STeve Andre' wrote: On Tuesday 23 January 2007 13:13, Dan Blasberg wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline. Yahoo! Groups Links
Re: [Repeater-Builder] Re: LMR-1200
At 05:03 PM 1/26/2007, you wrote: LMR-1200 is a hardline (I think), unlike 400 and 600, and is approximately 1 7/8. I am familiar with the foil/braid issues of 400 and 600, but have not had a chance to look at/play with 1200. So any and all comments are welcomed and appreciated. ---It is spec'd at 90% braid, 100% foil, so I don't think it's hardline. http://www.zcomax.com/htm/lmr1200.htm Ken -- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.ah6le.net/arcom/index.html Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net
RE: [Repeater-Builder] Re: LMR-1200
Use the LDF-4 73 Mike K5JMP www.k5jmp.us -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Dan Blasberg Sent: Friday, January 26, 2007 8:04 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: LMR-1200 Skipp and Jim, LMR-1200 is a hardline (I think), unlike 400 and 600, and is approximately 1 7/8. I am familiar with the foil/braid issues of 400 and 600, but have not had a chance to look at/play with 1200. So any and all comments are welcomed and appreciated. I do have access to several lengths of LDF-4 (??), that I was going to use and still may. Just wanted opinions/knowledge on the LMR-1200. Thanks, Dan KA8YPY On Jan 26, 2007, at 1:00 PM, skipp025 wrote: Yeah, a lot of you probably noticed I'm keeping quiet of this post. He said the price was free... if its the only boat in your harbour you probably take it for a ride. All my LMR cable problems have been with LMR-400 and 600 type cables. ... and lots of them so as you all know I don't like or use the LMR type cable anymore. cheers, skipp --- In Repeater-Builder@yahoogroups.com, Jim B. [EMAIL PROTECTED] wrote: Won't that still suffer from the foil/braid noise problem in duplex? I swear the LMR-1200 I saw had two braids and a foil shield... it's been a while though, and LMR cables were very new. -- Jim Barbour WD8CHL STeve Andre' wrote: On Tuesday 23 January 2007 13:13, Dan Blasberg wrote: Anybody have any opinions on LMR-1200 as feedline? I have access to about 100' with N connectors at both ends, that I am thinking of using for feedline. Yahoo! Groups Links Yahoo! Groups Links
