| Author |
Message |
    
Charliebrown
Junior Member
Username: Charliebrown
Post Number: 25
Registered: 10-2002
| | Posted on Sunday, February 22, 2004 - 5:26 am: | 
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i have rg 213/u coax from copper elect. it has a 95% shield. there is a rg 213/u c-17 which is mil. spec. to 98% shield. here is my question, i have 500 feet of coax to the antenna, how much less signal loss would one expect from the 95% compared to 98% shielded cable? i just wonder if this upgrade is really worth the price difference of app. 6 cents a foot? |
Tech181
Moderator
Username: Tech181
Post Number: 842
Registered: 7-2001
| | Posted on Sunday, February 29, 2004 - 12:53 am: |
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The difference is nominal Charliebrown, I doubt you will notice much difference.
Shielding is not the only factor. The dialectric is very important as well. Try to stick with polyethylene rather than foam.
That's a heck of a long run for regular coaxial cable, I would suggest you go with some sort of hardline if you really want low loss.
However if you want to stay on the less expensive side, you may want to look into Belden 9913, It has about the least loss you'll find in consumer grade coax. Now it IS a air-core/poly dialectric cable, BUT besides the braided shield it also offers a foil shield as well. It's darn near 100% shielded. Very good stuff.
It's tricky to work with at first but if you need help let me know! |
Charliebrown
Junior Member
Username: Charliebrown
Post Number: 28
Registered: 10-2002
| | Posted on Monday, March 01, 2004 - 10:48 pm: |
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thanks, i think i will look at the 9913 that belden offers. sounds just like what i need. |
Pp1616
Junior Member
Username: Pp1616
Post Number: 46
Registered: 2-2004
| | Posted on Monday, March 08, 2004 - 10:00 am: |
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would belden 9913 be better then lmr-400 ??? |
Tech808
Moderator
Username: Tech808
Post Number: 1728
Registered: 8-2002
| | Posted on Monday, March 08, 2004 - 11:12 am: |
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I use the 213 / 8U from Copper PART# C60-00012 which is Made by Superior Wire Company.
I switched from Belden to Superior about 8 years ago after Belden had a price raise and back then I was selling 4000 to 5000 feet a month.
I have NEVER had any compliant's on the Quality or Performance of it in any size.
Lon
Tech808
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Tech181
Moderator
Username: Tech181
Post Number: 863
Registered: 7-2001
| | Posted on Monday, March 08, 2004 - 9:02 pm: |
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RG/213 has about 1.6 dB loss per 100 feet at 50 Mhz and below frequencies. For 500 feet your loss would be 8 dB.
Belden 9913 has about 1.1 dB loss per 100 feet at 50 MHz and below frequenies. For 500 feet your loss would be 5.5 dB.
Times Microwave LMR400 has about .9 dB loss per 100 feet at 50 MHz and below frequencies. For 500 feet your loss would be 4.5 dB.
Andrew FSJ4-50B 1/2" Superflex has a .56 dB los per 100 feet at 30 MHz and below frequencies. For 500 feet your loss would be 2.8dB.
That should about cover it.
Of course as dB loss decreases, price increases.  |
Pig040
Intermediate Member
Username: Pig040
Post Number: 322
Registered: 7-2003
| | Posted on Tuesday, March 09, 2004 - 9:22 am: |
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I use the 213 also, and have been very satisfied with its performance, on a 20010 ft run. Like Lon said loss decrease price increase, that was my price limit. |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1721
Registered: 12-2001
| | Posted on Tuesday, March 09, 2004 - 10:57 pm: |
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Get rg213 and run a klv1000,that should take care of the 8 db loss,hehe OR get a 1 to 4 splitter and run 4 klv1000s,man that'll really put the rg213 to the test,Tech808 you could get with Tech8541 and hook this combo up and do a hands on review using a calorimeter to see how much heat is generated in the coax,then cut it open and show pics of the results,I'll bet it holds up and passes this test with flying colors. |
Tech808
Moderator
Username: Tech808
Post Number: 1751
Registered: 8-2002
| | Posted on Tuesday, March 09, 2004 - 11:44 pm: |
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Bigbob,
How far do you want us to run the Coax?
Tech8541 is in NC and I am in IL.
Lon
Tech808
PS, did you get the Tube ok? |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1723
Registered: 12-2001
| | Posted on Wednesday, March 10, 2004 - 6:11 am: |
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I'm sure it's at post office had to sell my other vehicle to stay in my house($$)so xyl can't get there during week,I will pick it up sat. and let you know of condition.Bigbob |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1724
Registered: 12-2001
| | Posted on Wednesday, March 10, 2004 - 6:13 am: |
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Maybe tech8541 could take two days off and get a little closer,like 500 feet,lol.Bigbob |
