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Message |
    
Big_thunder
New member
Username: Big_thunder
Post Number: 3
Registered: 9-2004
| | Posted on Friday, September 24, 2004 - 11:11 am: | 
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Can anyone tell about the 9913f coax. is it good coax for running high power? I was told it was and real sheild cuts down on inteference.Who sales this coax real cheap. |
Slugo4449
Junior Member
Username: Slugo4449
Post Number: 11
Registered: 7-2004
| | Posted on Friday, September 24, 2004 - 5:03 pm: |
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Belden 9913
Attenuation per 100 ft. 0.7db
Velocity Factor .84
50 ohm coax
Belden is the name of the company that makes the cable and they call it "9913". It is a special coax that has two outside shields! The first is a foil material that is on the outside of the dielectric, then over that is the regular copper braid. As a result, the cable is very efficient (low loss) and also STIFF (though they now make a 9913F that is supposed to be flexible)! With low loss comes cost, this cable is expensive.
I've seen it from 38 cents a foot to 58 cents a foot online.
You stated that you wanted to cut down on interference. If you are worried about causing TVI or RFI, then you should consider something to decouple the antenna from the coax. I use about 8 to 10 turns on the coaxial cable at the point where it feeds the antenna. Decoupling loops and baluns are a great way to stop interference.
CUL
Marty |
Big_thunder
New member
Username: Big_thunder
Post Number: 7
Registered: 9-2004
| | Posted on Friday, September 24, 2004 - 6:28 pm: |
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Oh ok slugo4449 what about high power that is one of my biggest concerns too. I heard it can handle big watts and do you know any place in particular that sells the 9913f at a good price per foot? |
Tech808
Moderator
Username: Tech808
Post Number: 3671
Registered: 8-2002
| | Posted on Friday, September 24, 2004 - 7:22 pm: |
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Big thunder,
Type the words 9913F Coax in your Web Browser Search box and it should bring up over 80 hits.
Hope this helps.
Lon
Tech808 |
Slugo4449
Junior Member
Username: Slugo4449
Post Number: 13
Registered: 7-2004
| | Posted on Friday, September 24, 2004 - 10:51 pm: |
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First off....what do you consider "HIGH POWER"?
On 11 meters you should be able to push 2,200-2,500 watts average through it.
Also 9913f is just slightly more lossy than 9913 but more flexable
Kinda overkill for 11 meters.
9913 is also good for long runs of coax (up to 1000 ft) especially at lower frequencies like 27 mhz.
I have found different manufacturers of a knock off of 9913 on Ebay. Look for cable that has been sweep generated to 2.2 gigs. It will be called RG8/U and will state double shielded. I think it is made in China.
9913f is specific to Belden and you are going to pay top dollar for it.
Like Tech 808 said, do a web search for it and be prepared for price shock!
CUL
Marty
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Big_thunder
Junior Member
Username: Big_thunder
Post Number: 12
Registered: 9-2004
| | Posted on Sunday, September 26, 2004 - 5:08 pm: |
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Hey slugo4449 I heard it will actually handle way more than 2,500 watts if fact rg213 will handle that with no problem. thanks for the infor.. |
Slugo4449
Junior Member
Username: Slugo4449
Post Number: 16
Registered: 7-2004
| | Posted on Sunday, September 26, 2004 - 6:45 pm: |
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Please note that there is a difference between "average" power and "P.E.P." |
Funtimebob
Intermediate Member
Username: Funtimebob
Post Number: 138
Registered: 5-2002
| | Posted on Sunday, October 17, 2004 - 3:45 am: |
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Check out Davis RF |
Highlander
Advanced Member
Username: Highlander
Post Number: 631
Registered: 12-2001
| | Posted on Sunday, October 17, 2004 - 2:05 pm: |
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Dittos on Davis RF--I use their "Bury-Flex" for my VHF/UHF stuff. Great cable, almost as good as LMR-400, but cheaper, and you can use regular connectors with it. I use their economy RG-213 for CB, it works great. |
Tech808
Moderator
Username: Tech808
Post Number: 3840
Registered: 8-2002
| | Posted on Sunday, October 17, 2004 - 2:52 pm: |
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And the Copper Coax 213U has the same specs as the Davis and is even cheaper than the Davis Coax and is made by S.I.W. (Superior Insulated Wire) the Oldest & Largest Coax Manufacturer in the US. |
Rf_burns
New member
Username: Rf_burns
Post Number: 4
Registered: 9-2005
| | Posted on Wednesday, August 09, 2006 - 3:59 am: |
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Hi 808,
I'm about to change my coax and add a Quality Line Isolator at the Feed Point as well as re-do some of my ground system. Both RF,and Safety Grounds. What would the Costs, Different Velocity Factors and Line Loss differences be between say Copper's 213U, as Compared to the Davis, both Regular and "Burry Flex, the Belden 99213 & 231F, compared to opening the wallet and vasiline for the LMR 400, and which one would show the most the benifits at a 60' Height and a 150'lenght at 11 meters over the Clear Jacket RG8X that's up their right now? Also what's the "Average Duty Cycle" for an IMAX 2K here in the North East? Never had a Fiberglass Antenna before, nor spent this much time on the radio in this part of the country. My present Imax has been up about four years and is (and always has performed more than just fine - and always suprisingly so!) but it has just gone through a Pretty Severe Hard Winter and an Extremely Hot Summer, and I only want to do this ONCE, and would rather invest in the Proper Feedline and Antenna as well if Necessary than alocate that money to any "Bowl" Sounding class C Base Amp at this time. Which is what they run out this way far too often. I need to be able to get my signal out but don't want to sound like that and figured that this was the best place in the system to start to get to that end. Thanking you in advance for your time, your knowledge and your help and I'll await your Much Appreciated Repy. 73's to You and Yours,
Many THX,
- R.F. BURNS -
AKA. "SkaDAheights"<g><g>
.... and that's why I perfer to Only do
this Once and Do it Right and Worry Free
and then Reaccess my Station's Short Comings
from the Ground!<g><g> |
Airplane1
Advanced Member
Username: Airplane1
Post Number: 857
Registered: 5-2004
| | Posted on Wednesday, August 09, 2006 - 6:48 am: |
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Get Belden 9913F7, it wont get water inside like regular Belden 9913 which is air dielectric and and it is very flexable + the center wont migrate.
Just MO.
AP |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1824
Registered: 7-2004
| | Posted on Wednesday, August 09, 2006 - 12:01 pm: |
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LMR-400 is one of your best coaxs. But, very
stiff and not very bendable.
I've personally have used the Belden 9913f
for years without any problems. It replaced
RG8U.
Can't comment about other coaxs, as i have
never used them.
It's hard to say how long your Imax 2000 will
last or any antenna as you never know year to year what mother nature will throw at it.
You may want to put something on it to protect
the fiberglass from splintering off over the
years. Good Luck! |
Chad
Senior Member
Username: Chad
Post Number: 1022
Registered: 11-2004
| | Posted on Wednesday, August 09, 2006 - 6:39 pm: |
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Does LMR-400 need a certain connector? I've heard people bash it because it uses a different type.
I've got the conduit made for the ground, Grounding TOTALLY redone, and antenna getting ready for order for 440/2M I just need cable. LMR400 is up there on the list and Copper has no 9913 
I could just buy more Bury-Flex but buryable is a non issue since the addition of duit underground. I need to do research soon eh?
Chad |
Znut
Advanced Member
Username: Znut
Post Number: 715
Registered: 1-2002
| | Posted on Wednesday, August 09, 2006 - 8:55 pm: |
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LMR 400 has a larger center conductor than RG8 and RG213 but not by much. Just check the connector to make sure it will fit the center contact of the plug. Also, do your soldering quick with a huge soldering iron or resistance "pliers" because the dielectric (insulation) melts easier than RG8 or 213.
Any questions, contact me.
Good Luck,
Znut
By the way, I make coax cable assemblies for a living. |
Dale
Advanced Member
Username: Dale
Post Number: 607
Registered: 12-2002
| | Posted on Wednesday, August 09, 2006 - 10:33 pm: |
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i use lmr400 also great coax and double shieled also.if your gonna run long runs like 100ft or more ya really need this type of coax for 11 meters.also rember this the 2 most important part of any cb station is
1 antenna
2coax
if ya run 100 ftor more of rg213 or similar or loss will be farily high.never tried the others
my lmr400 replaced my old rg213 |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1972
Registered: 9-2004
| | Posted on Thursday, August 10, 2006 - 12:14 am: |
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chad, i can tell you that a standard PL-259 will work with LMR400.
thats what i run, and have had to install a connector after changing the run to the shack around.
all i can say, is that i used 9913F7 for some jumpers and i did not like it.
the jacket feels like its letting the insides move around too much, and its not THAT bendable.
you can easily make an 8" diameter curve with the LMR400, and it will stay in that position.
when you cut open an end, you say, "OH YEAH! now THAT's what coax is supposed to look like!"
i really cant recommend it enough.
matt |
Chad
Senior Member
Username: Chad
Post Number: 1026
Registered: 11-2004
| | Posted on Thursday, August 10, 2006 - 8:38 am: |
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KV, I pretty much have my heart set on it for my 440/2M rig. I LOVE my bury-Flex, it's great stuff and has some great numbers. Some compare it to LMR400 but again why pay for direct buryable cable when it wil not be in soil contact anymore. The price of the 2 is quite close, I'd rather pay for loss quality than a feature I will not need 
Thanks for the info!!!
Chad |
