Re: [Elecraft] RG-8X
On 2/26/2018 3:15 PM, Bob McGraw K4TAX wrote: I found that not all RG-8X is created equal. Absolutely! And this is true of ALL coax types. There's a lot of junk floating around. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
DX Engineering 400MAX is an excellent choice, I'm sure you'll be pleased with its performance. Make the extra effort to seal the connectors very, very well and be sure you install the cable on your tower securely so that high winds cannot possibly cause abrasion of the coaxial cable jacket. Good luck! 73 Frank W3LPL - Original Message - From: "Richard" To: "Elecraft Reflector" Sent: Tuesday, February 27, 2018 2:02:32 AM Subject: Re: [Elecraft] RG-8X The problem is often I get an answer or a request for more info, and I reply without realizing that it goes to an individual’s e-mail address, not to the selector at large. It almost happened with this one. I was talking about 75 to 100 feet on 50 MHz. I plan to use DXE’s 400MAX, with which I have had excellent results before. Richard - W4KBX > On Feb 26, 2018, at 8:23 PM, donov...@starpower.net wrote: > > W4KBX hasn't commented about the frequency at which he intends > to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter > what type or manufacturer -- isn't the best choice for 100 foot cable > lengths at 21 MHz or above. > > > > It s a much better investment to step up to the next larger diameter > coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof > flooded coax) are much better choices for 100 foot cable lengths > at 21 MHz or above. > > > Of course its hard to beat LDF4-50A but at a cable length of only > 100 feet the difference in loss compared to LMR400 is less than > 1/2 dB at 50 MHz. You'll never notice the difference. > > > LDF4-50A or LMR600 is an excellent choice for a 200 foot coax > length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A > or LMR900 is a better choice. > > > All of this assumes proper installation. Moisture intrusion resulting > from poor installation practices will degrade your investment no > matter what coax you select. > > > 73 > Frank > W3LPL > > - Original Message - > > From: j...@kk9a.com > To: elecraft@mailman.qth.net > Sent: Monday, February 26, 2018 10:28:05 PM > Subject: [Elecraft] RG-8X > > The original post by W4KBX was this: "I’m seeking recommendations for > RG-8X coax with the lowest loss. The total run will be about 100 feet." > > You cannot defy physics and have low loss with 1/4" coax, no matter who > the manufacture is, but RG8X was his criteria. > > John KK9A > > > Jim Brown K9YC wrote: > > On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: >> I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. > My thinking, I would cringe at putting up a nice yagi such as this and > not use the feedline with the lowest loss possible. Most likely Andrew > LDF4-50A hardline. > > Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in > hardline, transitioning to a short length of flexible coax for the > rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is > about 1 dB on 6M. > > 73, Jim K9YC > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to donov...@starpower.net > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to flat...@comcast.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
The problem is often I get an answer or a request for more info, and I reply without realizing that it goes to an individual’s e-mail address, not to the selector at large. It almost happened with this one. I was talking about 75 to 100 feet on 50 MHz. I plan to use DXE’s 400MAX, with which I have had excellent results before. Richard - W4KBX > On Feb 26, 2018, at 8:23 PM, donov...@starpower.net wrote: > > W4KBX hasn't commented about the frequency at which he intends > to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter > what type or manufacturer -- isn't the best choice for 100 foot cable > lengths at 21 MHz or above. > > > > It s a much better investment to step up to the next larger diameter > coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof > flooded coax) are much better choices for 100 foot cable lengths > at 21 MHz or above. > > > Of course its hard to beat LDF4-50A but at a cable length of only > 100 feet the difference in loss compared to LMR400 is less than > 1/2 dB at 50 MHz. You'll never notice the difference. > > > LDF4-50A or LMR600 is an excellent choice for a 200 foot coax > length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A > or LMR900 is a better choice. > > > All of this assumes proper installation. Moisture intrusion resulting > from poor installation practices will degrade your investment no > matter what coax you select. > > > 73 > Frank > W3LPL > > - Original Message ----- > > From: j...@kk9a.com > To: elecraft@mailman.qth.net > Sent: Monday, February 26, 2018 10:28:05 PM > Subject: [Elecraft] RG-8X > > The original post by W4KBX was this: "I’m seeking recommendations for > RG-8X coax with the lowest loss. The total run will be about 100 feet." > > You cannot defy physics and have low loss with 1/4" coax, no matter who > the manufacture is, but RG8X was his criteria. > > John KK9A > > > Jim Brown K9YC wrote: > > On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: >> I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. > My thinking, I would cringe at putting up a nice yagi such as this and > not use the feedline with the lowest loss possible. Most likely Andrew > LDF4-50A hardline. > > Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in > hardline, transitioning to a short length of flexible coax for the > rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is > about 1 dB on 6M. > > 73, Jim K9YC > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to donov...@starpower.net > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to flat...@comcast.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
W4KBX hasn't commented about the frequency at which he intends to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter what type or manufacturer -- isn't the best choice for 100 foot cable lengths at 21 MHz or above. It s a much better investment to step up to the next larger diameter coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof flooded coax) are much better choices for 100 foot cable lengths at 21 MHz or above. Of course its hard to beat LDF4-50A but at a cable length of only 100 feet the difference in loss compared to LMR400 is less than 1/2 dB at 50 MHz. You'll never notice the difference. LDF4-50A or LMR600 is an excellent choice for a 200 foot coax length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A or LMR900 is a better choice. All of this assumes proper installation. Moisture intrusion resulting from poor installation practices will degrade your investment no matter what coax you select. 73 Frank W3LPL - Original Message - From: j...@kk9a.com To: elecraft@mailman.qth.net Sent: Monday, February 26, 2018 10:28:05 PM Subject: [Elecraft] RG-8X The original post by W4KBX was this: "I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet." You cannot defy physics and have low loss with 1/4" coax, no matter who the manufacture is, but RG8X was his criteria. John KK9A Jim Brown K9YC wrote: On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: > I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. My thinking, I would cringe at putting up a nice yagi such as this and not use the feedline with the lowest loss possible. Most likely Andrew LDF4-50A hardline. Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in hardline, transitioning to a short length of flexible coax for the rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is about 1 dB on 6M. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
I found that not all RG-8X is created equal. For one project, I measured 3 or 4 different brands of new RG-8X to find that the loss can vary considerably. The measurement method was to use 50 ft, snake it back an forth across the floor so as not to have adjacent coupling, the ends fitted with N type connectors and connected to my Spectrum Analyzer with tracking generator. Normal meaningful sweep was 0.1 MHz to 1 GHz. I don't recall the numbers but I was a bit surprised to find significant difference as I recall. The project was in preparation of antennas for Field Day operation. 73 Bob, K4TAX On 2/26/2018 4:28 PM, j...@kk9a.com wrote: The original post by W4KBX was this: "I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet." You cannot defy physics and have low loss with 1/4" coax, no matter who the manufacture is, but RG8X was his criteria. John KK9A Jim Brown K9YC wrote: On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. My thinking, I would cringe at putting up a nice yagi such as this and not use the feedline with the lowest loss possible. Most likely Andrew LDF4-50A hardline. Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in hardline, transitioning to a short length of flexible coax for the rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is about 1 dB on 6M. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] RG-8X
The original post by W4KBX was this: "I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet." You cannot defy physics and have low loss with 1/4" coax, no matter who the manufacture is, but RG8X was his criteria. John KK9A Jim Brown K9YC wrote: On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: > I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. My thinking, I would cringe at putting up a nice yagi such as this and not use the feedline with the lowest loss possible. Most likely Andrew LDF4-50A hardline. Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in hardline, transitioning to a short length of flexible coax for the rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is about 1 dB on 6M. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
On 2/26/2018 10:45 AM, Tom Georgens wrote: HI Jim Thanks for your informed commentary One question I have had is, if loss is dominated by resistive losses at HF, does coax actually get more lossy with age? If so, what is the mechanism. Does the dielectric change properties, or do the copper surfaces corrode or break down? If the dielectric breaks down, then the impedance should change as well Most info on cable life deal primarily with the UV, heat, and moisture resistance of the jacket but I have seen very little about aging of the internal components. Hi Tom. I don't know enough about this issue to say anything useful, except for this. When N6RZ died something like 8 years ago, I bought a lot of his stuff and helped his XYL, Kerry, get rid of the rest of it. He had a lot of coax and some hard line; I bought the hard line, and took the random lengths of coax to an NCCC meeting, telling members where it had come from. Almost all of it was good quality stuff, some used inside, some outside. I even found some stored in a shed. I'd guess most of it was at least 20 years old. Everyone turned their noses up at it, so I brought it home, made stubs out of it, and measured their effectiveness. I didn't have a VNA then, so I used an HP generator and HP spectrum analyzer (as an RF voltmeter), doing point by point measurements. Most of the stub data in that Q&A are for that cable. Since a harmonic stub depends on a low value of impedance to work, that tells me the cables were still quite good. The only bad piece of cable I found was one whose interior jacket was green from oxidation of the shield. I think it had come from that shed. Until I learn more about it, I go under the assumption that the primary hazard is moisture. Because dielectric loss doesn't kick in until at least UHF, I don't buy that being as a factor at HF. A few years ago, I noticed moisture around the Polyphaser for one of my high dipoles when I removed it for some reason. I had only recently replaced the dipole and the coax run (Belden 8213), but hadn't done a good enough job of sealing the coax around the center insulator. Water penetrated, came down between the braid and dielectric, and in less than a year, had turned the shield black. I put that length of coax on the VNA and found that loss had increased from about 0.4 dB to about 0.45 dB. I'm copying this to the reflector, hoping that guys like W3LPL will jump in with more. 73, Jim Thanks Tom W2SC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Monday, February 26, 2018 10:11 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] RG-8X On 2/26/2018 9:28 AM, j...@kk9a.com wrote: I believe all RG8X has a .242 diameter PVC jacket and about the same loss. Certainly some brands are better made, I use only Belden 9258. Not quite. First, for at least 40 years, RG-numbers are NOT a specification, but only a generic description of cable, mostly telling us the approximate outer diameter and the characteristic impedance (Zo). Below about 500 MHz, loss in coax is all due to I squared R, which depends entirely on the combined resistance of the center conductor and the shield at the frequency of interest. Zo depends on conductor diameters, spacing, and the dielectric material. Coax with a foam dielectric allow the center conductor to be larger for the same shield diameter. THAT'S why foam cables have lower loss, NOT because of lower loss in the dielectric -- dielectric loss doesn't show up until we're well into the UHF region. Shield resistance is reduced by a larger diameter for two reasons -- more copper and skin effect. Many coax cables don't use copper for center or shield or both. Loss will be greater at low frequencies if the center is copper-coated steel, which is often done for both cost and physical strength. Loss will also be greater if the shield uses less copper or is made from aluminum. As usual, Frank has asked the right questions -- there are important "applications-related" differences between coax types, even from the same manufacturer. In general, it's best to use bigger coax from a trusted manufacturer, and with the best quality shield. Larger coax has less loss. Don't buy smaller coax because you're running low power -- our Field Day team runs QRP, and all of our coax is RG8-size with a foam dielectric for low loss and a robust copper braid shield! There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support thi
Re: [Elecraft] RG-8X
On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. My thinking, I would cringe at putting up a nice yagi such as this and not use the feedline with the lowest loss possible. Most likely Andrew LDF4-50A hardline. Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in hardline, transitioning to a short length of flexible coax for the rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is about 1 dB on 6M. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. My thinking, I would cringe at putting up a nice yagi such as this and not use the feedline with the lowest loss possible. Most likely Andrew LDF4-50A hardline. Bob, K4TAX Sent from my iPhone > On Feb 26, 2018, at 12:21 PM, Dave Cole (NK7Z) wrote: > > Thanks for sharing! Very interesting. > > 73s and thanks, > Dave > NK7Z > https://www.nk7z.net > >> On 02/26/2018 10:10 AM, Jim Brown wrote: >> >> There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf >> 73, Jim K9YC > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to rmcg...@blomand.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
Thanks for sharing! Very interesting. 73s and thanks, Dave NK7Z https://www.nk7z.net On 02/26/2018 10:10 AM, Jim Brown wrote: There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
On 2/26/2018 9:28 AM, j...@kk9a.com wrote: I believe all RG8X has a .242 diameter PVC jacket and about the same loss. Certainly some brands are better made, I use only Belden 9258. Not quite. First, for at least 40 years, RG-numbers are NOT a specification, but only a generic description of cable, mostly telling us the approximate outer diameter and the characteristic impedance (Zo). Below about 500 MHz, loss in coax is all due to I squared R, which depends entirely on the combined resistance of the center conductor and the shield at the frequency of interest. Zo depends on conductor diameters, spacing, and the dielectric material. Coax with a foam dielectric allow the center conductor to be larger for the same shield diameter. THAT'S why foam cables have lower loss, NOT because of lower loss in the dielectric -- dielectric loss doesn't show up until we're well into the UHF region. Shield resistance is reduced by a larger diameter for two reasons -- more copper and skin effect. Many coax cables don't use copper for center or shield or both. Loss will be greater at low frequencies if the center is copper-coated steel, which is often done for both cost and physical strength. Loss will also be greater if the shield uses less copper or is made from aluminum. As usual, Frank has asked the right questions -- there are important "applications-related" differences between coax types, even from the same manufacturer. In general, it's best to use bigger coax from a trusted manufacturer, and with the best quality shield. Larger coax has less loss. Don't buy smaller coax because you're running low power -- our Field Day team runs QRP, and all of our coax is RG8-size with a foam dielectric for low loss and a robust copper braid shield! There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] RG-8X
I believe all RG8X has a .242 diameter PVC jacket and about the same loss. Certainly some brands are better made, I use only Belden 9258. Perhaps the question should be what is the best coax with a diameter less than ??? or weight less then ???, for ??? MHz, good for ??? watts for a portable/permanent installation? There might be some interesting options. John KK9A Mon Feb 26 12:07:16 EST 2018 Hi Richard, Please provide a little more information so that your question can be answered more accurately. At what frequencies will you be using your coax? Will your coax be buried or laid on the ground, or will it not be in contact with the ground at all? Many coaxial cables have a vinyl jacket which is very susceptible to moisture penetration if buried or laid on moist ground. Are rodents (squirrels, mice, etc) a problem in your area? Vinyl jacketed coax is very susceptible to rodent damage which will quickly increase your coax loss. 73 Frank W3LPL From: Richard To: Elecraft Reflector Sent: Monday, February 26, 2018 8:35 AM Subject: [Elecraft] RG-8X I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet. Cheers! Richard Kunc — W4KBX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
Hi Richard, Please provide a little more information so that your question can be answered more accurately. At what frequencies will you be using your coax? Will your coax be buried or laid on the ground, or will it not be in contact with the ground at all? Many coaxial cables have a vinyl jacket which is very susceptible to moisture penetration if buried or laid on moist ground. Are rodents (squirrels, mice, etc) a problem in your area? Vinyl jacketed coax is very susceptible to rodent damage which will quickly increase your coax loss. 73 Frank W3LPL From: Richard To: Elecraft Reflector Sent: Monday, February 26, 2018 8:35 AM Subject: [Elecraft] RG-8X I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet. Cheers! Richard Kunc — W4KBX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
In using ARRL Transmission Line for Windows application: RG-8X Belden 100 ft @ 50 MHz has 2.5 dB loss LMR-240 Times Microwave 100 ft @ 50 MHz has 1.7 dB loss RG -213 Belden 8267 has 1.5 dB loss at 50 MHz RG-8 Belden 9913 has 0.88 dB loss for 100 ft at 50 MHz. {Due to the nature of this line having a lot of air content, the reason for low loss, it is reported to have moisture condensation issues. Thus I would avoid it for outside use.} Andrew LDF4-50A which is 1/2" hard line has 0.44 dB loss at 50 MHz These were just a few I checked. All values calculated for 100 ft, with a 1:1 SWR at 50 MHz. I would cringe at the thought of putting up a fine antenna and loose any performance on transmit and receive due to feed line loss. In my case I have a 4 element HyGain 6M yagi which is fed with about 75 ft of Andrew LDF4-50. I selected the 4 element on a 12 ft boom as opposed to the 5 element on a 12 ft boom. The side lobe pattern on the 4 element yagi is much cleaner, hence noise off axis is lessened. I didn't see any polar response plots on their site so I can't comment on overall performance of the 6OWL6. 73 Bob, K4TAX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RG-8X
Richard..If you are set on using the small size the real LMR-240 is the best bet..also may want to check with MFJ.. they now carry a very good line of coax!! 73s Bob W5RG From: Richard To: Elecraft Reflector Sent: Monday, February 26, 2018 8:35 AM Subject: [Elecraft] RG-8X I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet. Cheers! Richard Kunc — W4KBX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] RG-8X
I’m seeking recommendations for RG-8X coax with the lowest loss. The total run will be about 100 feet. Cheers! Richard Kunc — W4KBX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com