| Author |
Message |
    
Cobra0020
| | Posted on Sunday, September 21, 2003 - 10:09 pm: | 
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Ok I Need To run 200ft of 2 strands of coax to my radio room. For My White lighting Beam. What Kind of coax should i get for the budget price. Sombody said 9913 or 213 Or what else. I have Rg8u But people said too much loss.
thanks
Cobra |
Taz
| | Posted on Sunday, September 21, 2003 - 11:26 pm: |
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213 and 9913 still have too much loss
lmr600 would be the best. |
Reno
| | Posted on Monday, September 22, 2003 - 4:32 am: |
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hello Cobra.
Do some comparison shopping on line cost verses quality. Depending on what frequency your going to use it on , I assume 27Mhz, some different kinds of coax vary on there Db loss. You should take this in consideration. the quality of the coax you use is going to directly affect the quality of the signal you radiate from the antenna.
cff:Reno
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de
| | Posted on Monday, September 22, 2003 - 7:49 am: |
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I checked out the cost of the coax recommended by tax. I also agree with him that very low loss coax should be used given the distance you wish to run it.
So here goes. Per a well known ham supplier:
213 or the replacement for RG8 runs .36 per foot or for 400 feet $144 plus shipping and handling.
IF you get the 600 now that is a horse of another color. It is a very low loss coax BUT the price is $1.19 per ft. or if you run 400 feet $476 plus shipping and handling.
My suggestions. MOVE the antenna within 100 feet and use the 213 |
Cobra0020
| | Posted on Monday, September 22, 2003 - 8:31 am: |
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Ok Somebody said that Lmr400 Was to stiff to run on a crank up tower. If you think its not i might get Lmr400 What do yall think? The antenna is for 27 mhz |
Znut
| | Posted on Monday, September 22, 2003 - 10:18 am: |
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RG 213 will have about 2db loss at the lengths you are looking at. 9913 will be even less.
Considering the length to your run, that's not bad. Beleive it or not, it will be serviceable. Remember, the background noise will be down 2db also and unless it is really quiet I have half a meter full of noise! |
Pig040
| | Posted on Monday, September 22, 2003 - 10:43 am: |
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I just ran 200 feet of 213, and have both ground planes up. The one I had up first is on 100 feet of rg58 I have no noticeable signal loss from the antenna using the long coax. I tried to broadcast with both, and recieved better reports on the one with 200 feet of coax. I am sure there is more loss, but not as much a you would think. Go with the 213, use the extra money to buy a kicker, haha.
Pig |
Cobra0020
| | Posted on Monday, September 22, 2003 - 2:01 pm: |
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Is this what i should get? What do yall think the person said. it has the exact characteristics of lmr400 and that is pretty cheap if its like that. What do yall think
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3048697297
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Znut
| | Posted on Monday, September 22, 2003 - 3:15 pm: |
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You will not end up saving a whole bunch vs real LMR 400. If I knew who the manufacturer of that coax is I could tell you more.
Harbour HPF400 is actually a little better than LMR 400 but I don't know that is who made the spool you are looking at.
You are welcome to email me for further discussion on this. |
Bullet
| | Posted on Monday, September 22, 2003 - 5:00 pm: |
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go for it
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Brassmonkey
| | Posted on Monday, September 22, 2003 - 5:33 pm: |
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anyone gonna be on 2 meters for the sprint tonight? |
Alsworld
| | Posted on Monday, September 22, 2003 - 9:31 pm: |
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Another alternative is DavisRF Buryflex coax. Low loss doubleshielded high quality coax that is very reasonably priced and flexible with one of the best outer jackets. You can compare it vs others on the website at http://www.davisrf.com.
Don't be missled by other coax called buryflex, I refer only to this brand. I use it myself.
Alsworld
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Znut
| | Posted on Monday, September 22, 2003 - 10:34 pm: |
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What freq. Monkey? |
Kc0gxz
| | Posted on Tuesday, September 23, 2003 - 1:09 am: |
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Cobra0020
Znut explained it all very well in his posts. And besides, the companys "claimed gain and multiplcation factor" of your beam will make up for the little bit of loss in the coax.
At 27Mhz, it's not near as critical as most people are led to believe. Now if you were playing in the 400Mhz and higher range, I would be far more concerned about my choice of coax.
73
Jeff, kc0gxz. |
Cobra0020
| | Posted on Tuesday, September 23, 2003 - 10:21 am: |
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What do yall think of that coax on ebay? Is that what i should get? |
Znut
| | Posted on Tuesday, September 23, 2003 - 3:13 pm: |
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It looks good but the price (199 dollars) is only so-so, not great. |
fancypants
| | Posted on Saturday, October 04, 2003 - 4:43 am: |
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213 is the best "universal" coax that you're going to find. Just make sure that you get "real" 213 as this will say "type II", "non-contaminating" or "mil-spec XXXX" on the jacket. There are many cables out there claiming to be 213, but "type II" or "non-contaminating" jackets only come in black. All 213 is poly, not foam dielectric.
9913 has some big problems and is susceptible to impedance bumps, kinking and collecting condensation internally. I would avoid it unless your climate didn't vary much and you had a very straight run with minimal bends required.
LMR is great stuff, but it suffers from some of the same problems that 9913 does, but not as severely. It is much stiffer, doesn't like a tight bend radius, is susceptable to kinking, etc... I would not want to use this in an installation that required a lot of flexing or movement due to its' rigidity. Mounting it on a stationary tower, probably not a problem. On a crank-up that will be cranked on occassion, no way.
Go with the 213 and make sure that the Amphenol ends ( DON'T use generic connectors ) are properly soldered ( both the "hot" and the shield ). Once that is taken care of, make sure that you use "Coax Seal" ( available at "da Shack" ) to weatherize the outside connections. Ground both the antenna hub and the tower. |
Kraig
| | Posted on Saturday, October 04, 2003 - 6:25 pm: |
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You could use a remote coax switch.
I have my switch attached to the top of the first section of my 75 foot crankup tower (75 feet of six condutor control cable and 75 feet of LMR 600) from the radio to the switch.
I then run two sections of flexible coax up the tower to my Moonraker IV beam, and one section of coax to my ground plane on a 30 ft push up pole on the roof (50 ft each of 9913).
75 feet of LMR 600, the switch and 75 feet of six wire rotor cable are cheaper than 225 feet of LMR 600 they replace. |
Bigbob
| | Posted on Saturday, October 04, 2003 - 11:22 pm: |
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Put an adaptor on the back of the last box in your system and use N-connectors they are water proof and go to your hardware and get some butyl glazing tape,best waterproofer for open joints ever made. |
