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Feed Line
开云体育Hi All,
?
?We have the following setup
for our 1.2 gig Dstar repeater and we are looking for the industry
standard
when it comes to the
correct feed line between the
repeater and the Antenna.
?
Can someone give us a
suggestion???
?
Feed line length is 125' from repeater to
antenna
?The duplexor model is 28-97-01B (http://www.birdrf.com/Products/Duplexers_Triplexers/Duplexers/896-3000%20MHz/28-97-01B_1215-1300-MHz-Duplexer.aspx#.VNjV8010zio ). The insertion loss listed is 1.0dB The Antenna is a Hustler HS12-12430 Hustler Spirit -- HS12-12430 (12 dBd) ? *?? Gain: 6 dBd, 9 dBd, 12 dBd ? *?? Bandwidth: 80 MHz. ? *?? V.S.W.R.: 1.5:1 ? *?? Polarization: Vertical ? *?? Power Rating: 300 Watts Maximum ? *?? Termination: Type N Female ? *?? Vertical Aperture (3 dB from max.): Any help would be appreciated. ?
? 7 3 de
Angelo |
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beamar
You have made an excellent choice for an antenna and duplexer. I have had a Spirit up, for some years. now. As to transmission line. How low do you want to keep your losses and how much money do you have? 125 feet of 1 5/8" heliax would have about 1 db of loss. 1 1/4" would have about 1.25 db loss. 7/8" would have about 1.6 db. 5/8" about 2.4 db. LMR 400 probably around 6 db. Obviously the lower loss cable will cost you more money. So will the connectors.? -- Buddy WB4OMG |
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Dallas KD4HNX
Angelo, From what you have listed below it looks like y'all are running a totally new cable run from the repeater rack to a new antenna... Hopefully most of your 125' run is UP and not wasted getting out of the building... I would go with?7/8" Heliax coax cable... ?LDF5-50A is not cheap but finding a surplus 125' piece is doable... ?Lots of cell towers use it and they buy it by the 500-1000' spool Most folks don't connect this directly to the duplexer or the antenna so a slightly shorter pieces works fine... ?Just as the cable enters the building you can put your lighting protection device and transition from 7/8" to 1/2" Heliax to run in the building... ?That way you won't need a 700 pound gorilla to fight with the coax run in side trying to make the 7/8" stuff bend and follow the cable tray... ?You would also have a 1/2" Heliax pig-tail going to the antenna... ? I've only helped with one tri-band D-Star install and we are getting ready to move it from the 4th story roof of a hospital roof to the new 8th floor roof... ? We went a different route... ?Our 1.2GHz DV and DD are combined and then we used a 3-band Diplexor/Splitter at the back of the repeater rack to get all 4 RF signals into one Heliax run... ?Then we purchased the best 3-band "D-Star" antenna we could get.... ?That way the cost of the Heliax is spread across the 3 repeaters and the 1.2GHz DD... If most of your 125' is getting out of the building then it might just make sense to stick with 1/2" Heliax for the hole run as with our hospital install... ?We only are going 20' up a tower and the other 60' or so is in the building... ? I hope this helps....
? 73 Dallas, KD4HNX Whatever you do, don’t fall victim to?“paralysis by analysis.” Go ahead and buy/build one and start? tinkering with it. This is a learn by doing hobby. No politician or scholar assured your freedoms. A Soldier, Sailor, Marine, or Airman did! From: "Angelo Glorioso n5uxt@... [D-STAR_23cm]" To: D-STAR_23cm@... Sent: Tuesday, February 10, 2015 11:17 AM Subject: [D-STAR_23cm] Feed Line Hi All,
?
?We have the following setup
for our 1.2 gig Dstar repeater and we are looking for the industry
standard
when it comes to the
correct feed line between the
repeater and the Antenna.
?
Can someone give us a
suggestion???
?
Feed line length is 125' from repeater to
antenna
?The duplexor model is 28-97-01B (http://www.birdrf.com/Products/Duplexers_Triplexers/Duplexers/896-3000%20MHz/28-97-01B_1215-1300-MHz-Duplexer.aspx#.VNjV8010zio ). The insertion loss listed is 1.0dB The Antenna is a Hustler HS12-12430 Hustler Spirit -- HS12-12430 (12 dBd) ? *?? Gain: 6 dBd, 9 dBd, 12 dBd ? *?? Bandwidth: 80 MHz. ? *?? V.S.W.R.: 1.5:1 ? *?? Polarization: Vertical ? *?? Power Rating: 300 Watts Maximum ? *?? Termination: Type N Female ? *?? Vertical Aperture (3 dB from max.): Any help would be appreciated. ?
? 7 3 de
Angelo
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I don't have a 23cm repeater, but I haven't seen a reply here either.
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I would use the largest coax I could justify. LMR-600 has about 3 db loss per 100'. Andrew Heliax 1/2" LDF4-50A has about 2.5 dB loss per 100'. If I could justify the price and benefit, I'd even try to go larger, but I wouldn't go smaller. You will loose that signal on receive as well. There are probably other opinions, but I thought I'd share mine. Good luck with it all. Arnold KQ6DI ----- Original Message -----
From: "Angelo Glorioso n5uxt@... [D-STAR_23cm]" <D-STAR_23cm@...> To: <D-STAR_23cm@...> Sent: Tuesday, February 10, 2015 9:17 AM Subject: [D-STAR_23cm] Feed Line Hi All, We have the following setup for our 1.2 gig Dstar repeater and we are looking for the industry standard when it comes to the correct feed line between the repeater and the Antenna. Can someone give us a suggestion??? Feed line length is 125' from repeater to antenna The duplexor model is 28-97-01B ( ). The insertion loss listed is 1.0dB The Antenna is a Hustler HS12-12430 Hustler Spirit -- HS12-12430 (12 dBd) * Gain: 6 dBd, 9 dBd, 12 dBd * Bandwidth: 80 MHz. * V.S.W.R.: 1.5:1 * Polarization: Vertical * Power Rating: 300 Watts Maximum * Termination: Type N Female * Vertical Aperture (3 dB from max.): Any help would be appreciated. 7 3 de Angelo |
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Angelo and others,
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?? I asked the guy that put together our system, which is not on the air yet, but hope to have it soon.?? Below is his response about what we use.?? He did not give me the model number of the 7/8" heliax, but I think it is the same as what Dallas mentions. 73, Tom KC9ONY?? (see below) "The answer is 130ft of 7/8" Heliax with an 18ft flexible jumper of RG-218 on the antenna side of the Heliax and 5ft of RG-217 on the combiner side. I would say that is about the maximum length for 7/8" Heliax. A jump to 1-5/8" Heliax would be in order for runs that are longer. Some folks might say that 1-5/8" heliax is overkill, but I remind everyone that all 1.2GHz D-Star equipment is only 10 watts transmit power. With the losses in a combiner, it would be no problem on even a relativily short run to end up with less than 5 watts arriving at the antenna. " ---In D-STAR_23cm@..., <mylastname@...> wrote : Angelo, From what you have listed below it looks like y'all are running a totally new cable run from the repeater rack to a new antenna... Hopefully most of your 125' run is UP and not wasted getting out of the building... I would go with?7/8" Heliax coax cable... ?LDF5-50A is not cheap but finding a surplus 125' piece is doable... ?Lots of cell towers use it and they buy it by the 500-1000' spool Most folks don't connect this directly to the duplexer or the antenna so a slightly shorter pieces works fine... ?Just as the cable enters the building you can put your lighting protection device and transition from 7/8" to 1/2" Heliax to run in the building... ?That way you won't need a 700 pound gorilla to fight with the coax run in side trying to make the 7/8" stuff bend and follow the cable tray... ?You would also have a 1/2" Heliax pig-tail going to the antenna... ? I've only helped with one tri-band D-Star install and we are getting ready to move it from the 4th story roof of a hospital roof to the new 8th floor roof... ? We went a different route... ?Our 1.2GHz DV and DD are combined and then we used a 3-band Diplexor/Splitter at the back of the repeater rack to get all 4 RF signals into one Heliax run... ?Then we purchased the best 3-band "D-Star" antenna we could get.... ?That way the cost of the Heliax is spread across the 3 repeaters and the 1.2GHz DD... If most of your 125' is getting out of the building then it might just make sense to stick with 1/2" Heliax for the hole run as with our hospital install... ?We only are going 20' up a tower and the other 60' or so is in the building... ? I hope this helps....
? 73 Dallas, KD4HNX Whatever you do, don’t fall victim to?“paralysis by analysis.” Go ahead and buy/build one and start? tinkering with it. This is a learn by doing hobby. No politician or scholar assured your freedoms. A Soldier, Sailor, Marine, or Airman did! From: "Angelo Glorioso n5uxt@... [D-STAR_23cm]" <D-STAR_23cm@...> To: D-STAR_23cm@... Sent: Tuesday, February 10, 2015 11:17 AM Subject: [D-STAR_23cm] Feed Line Hi All, ? ?We have the following setup
for our 1.2 gig Dstar repeater and we are looking for the industry
standard when it comes to the
correct feed line between the
repeater and the Antenna. ? Can someone give us a
suggestion??? ? Feed line length is 125' from repeater to
antenna ?The duplexor model is 28-97-01B (http://www.birdrf.com/Products/Duplexers_Triplexers/Duplexers/896-3000%20MHz/28-97-01B_1215-1300-MHz-Duplexer.aspx#.VNjV8010zio ). The insertion loss listed is 1.0dB The Antenna is a Hustler HS12-12430 Hustler Spirit -- HS12-12430 (12 dBd) ? *?? Gain: 6 dBd, 9 dBd, 12 dBd ? *?? Bandwidth: 80 MHz. ? *?? V.S.W.R.: 1.5:1 ? *?? Polarization: Vertical ? *?? Power Rating: 300 Watts Maximum ? *?? Termination: Type N Female ? *?? Vertical Aperture (3 dB from max.): Any help would be appreciated. ? ? 7 3 de
Angelo |
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开云体育There really is no such thing as the “Correct feed line” ? Which feedline should you use, that’s easy, the best one that you have the money to get. ? ? Figure out much gain you want, take the gain of the antenna and subtract the loss of the coax. LMR-200 has a loss of about 14 db at 1.2 GHz. So that means 10 watts from the ID-1 ends up being about 5 watts ERP. Move to LMR and you end up with a +10db budget, for about 20W ERP. ? Here’s a decent page to calculate coax loss. ? For 1.2 GHz, if your antenna has more gain than the coax has loss, then life is pretty good. ? But LMR-900 is about $5 per foot, and when you add connectors, about $700 total. ? As I said, you really want to get the best feedline that you can afford. 1.2GHz is really lossy. ? Ed WA4YIH ? From: D-STAR_23cm@... [mailto:D-STAR_23cm@...]
Sent: Tuesday, February 10, 2015 12:17 PM To: D-STAR_23cm@... Subject: [D-STAR_23cm] Feed Line ? ? Hi All, ? ?We have the following setup for our 1.2 gig Dstar repeater and we are looking for the industry standard when it comes to the correct feed line between the repeater and the Antenna. ? Can someone give us a suggestion??? ? Feed line length is 125' from repeater to antenna ?The duplexor model is 28-97-01B (http://www.birdrf.com/Products/Duplexers_Triplexers/Duplexers/896-3000%20MHz/28-97-01B_1215-1300-MHz-Duplexer.aspx#.VNjV8010zio ). The insertion loss listed is 1.0dB ? ? 7 3 de Angelo
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