| Author |
Message |
    
Conner
New member
Username: Conner
Post Number: 4
Registered: 2-2014
| | Posted on Monday, February 24, 2014 - 11:45 pm: | 
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How much wattage is recomended for rg8x, I think I made a mistake in ordering 100ft of the stuff (premade) 2day to go to a A99 hooked to a 2970n2 |
Revpo
Advanced Member
Username: Revpo
Post Number: 680
Registered: 7-2006
| | Posted on Tuesday, February 25, 2014 - 11:35 am: |
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I agree, you should have gotten something more substantial
CEF 795
73
REVPO/DOCTOR/CEF 795
Wavin a hand from the cornfields of INDIANA
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Sitm
Advanced Member
Username: Sitm
Post Number: 504
Registered: 1-2004
| | Posted on Tuesday, February 25, 2014 - 2:24 pm: |
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Conner, here is the information that you might find interesting. Remember that purchasing coax for HF is different than when purchasing it for VHF/UHF.
These figures are all for 100 feet.
You must consider how much power you intend to run and what frequencies that you intend to use on that particular coax.
RG-8x coax on 30 MHz has a power capacity of 350 watts. Generally
Personally I use RG-214 or RG-214 for my HF applications. They both have a power capacity on 30 MHz of 1800 watts.
For VHF/UHF you need less loss.
For these bands I use Belden 9913 or LMR 400. The equivalent of these can be purchased here at Copper Electronics.
Spending money on radios is great, but be mindful to put the best coax for your station. There are attenuation/power capacity charts in abundance on the internet. Here are some on bing.
Good luck, keep the questions coming.
http://www.bing.com/images/search?q=coax+attenuation+chart&qpvt=coax+attenuation+chart&FORM=IGRE |
Conner
New member
Username: Conner
Post Number: 5
Registered: 2-2014
| | Posted on Tuesday, February 25, 2014 - 3:06 pm: |
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Is RG8X for 11 meter? |
Sitm
Advanced Member
Username: Sitm
Post Number: 505
Registered: 1-2004
| | Posted on Tuesday, February 25, 2014 - 4:49 pm: |
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It is for High Frequency 1.8 to 30 MHz. With the power rating that I gave you earlier.
If you don't intend to run a kilowatt, it should be fine. |
Dale
Senior Member
Username: Dale
Post Number: 2041
Registered: 12-2002
| | Posted on Tuesday, February 25, 2014 - 6:22 pm: |
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yes. its mini 8. usually gray in color
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
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Conner
New member
Username: Conner
Post Number: 6
Registered: 2-2014
| | Posted on Tuesday, February 25, 2014 - 6:39 pm: |
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Ok. Thanks fellers. Been a while since I radioed.
Grey mini 8 what I used b4, Did ok then. Made order from Copper yesterday Radio,meter, coax ant. I only hope the 2970n will go as low as 5, no more than 10 watts on low |
Conner
New member
Username: Conner
Post Number: 8
Registered: 2-2014
| | Posted on Tuesday, February 25, 2014 - 10:35 pm: |
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Got a stupid q, Is 11 meter (like 27.205) HF? |
Sitm
Advanced Member
Username: Sitm
Post Number: 506
Registered: 1-2004
| | Posted on Tuesday, February 25, 2014 - 11:42 pm: |
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American Cb Radio Frequencies
1 26.965 MHz
2 26.975 MHz
3 26.985 MHz
4 27.005 MHz
5 27.015 MHz
6 27.025 MHz Superbowl of CB Radio
7 27.035 MHz
8 27.055 MHz
9 27.065 MHz
10 27.075 MHz
11 27.085 MHz
12 27.105 MHz
13 27.115 MHz
14 27.125 MHz
15 27.135 MHz
16 27.155 MHz
17 27.165 MHz
18 27.175 MHz
19 27.185 MHz Truckers Channel
20 27.205 MHz
21 27.215 MHz
22 27.225 MHz
23 27.255 MHz
24 27.235 MHz
25 27.245 MHz
26 27.265 MHz
27 27.275 MHz
28 27.285 MHz
29 27.295 MHz
30 27.305 MHz
31 27.315 MHz
32 27.325 MHz
33 27.335 MHz
34 27.345 MHz
35 27.355 MHz
36 27.365 MHz
37 27.375 MHz
38 27.385 MHz
39 27.395 MHz
40 27.405 MHz |
Milkman21218
Advanced Member
Username: Milkman21218
Post Number: 575
Registered: 1-2004
| | Posted on Friday, February 28, 2014 - 1:15 am: |
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RG8x will work but larger coax is better for a base antenna run.
Izzy
CEF#502
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Conner
Junior Member
Username: Conner
Post Number: 13
Registered: 2-2014
| | Posted on Saturday, March 01, 2014 - 5:08 pm: |
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True Milkman, but I went with RG8X & it's ok 4 now |
Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 10
Registered: 5-2014
| | Posted on Wednesday, May 21, 2014 - 9:12 am: |
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The goal is to loose less then 1db of signal in the length of coax you plan to use.
3db is a factor of + or - 100 or 50%
If you gain 3 db - you double your power.
If you loose 3 db - you loose half of your signal.
There is no use in buying a 50 or 100 watt radio if you are not willing to feed it with the best coax you can afford.
There is more gains to be had by using a efficient antenna and good coax then there is in using a poor radiator and junk coax.
RG8x is usually used for jumpers and very short runs on HF frequencies.
Its rated power handling capacity is about 200 watts. |
Conner
Junior Member
Username: Conner
Post Number: 34
Registered: 2-2014
| | Posted on Wednesday, May 21, 2014 - 4:50 pm: |
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tell us more
303 va
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Dale
Senior Member
Username: Dale
Post Number: 2085
Registered: 12-2002
| | Posted on Wednesday, May 21, 2014 - 7:39 pm: |
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for 100 feet i would have gotten coppers
400 low loss coax. and i do agree NEVER skimp
on coax or antenna.a 300.00 radio wont have
full potential with inferior antenna/coax system
however get a 50.00 dollar with a stellar antenna
and the lowest loss coax u can afford[400 series is normal] and great antenna and you,ll have a great setup
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
|
Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 14
Registered: 5-2014
| | Posted on Thursday, May 22, 2014 - 5:42 pm: |
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If you look at the performance of LMR 400 and Belden 9913F-7, they are similar.
The key to getting it to work is to use a crimping tool and Amphenol crimp on connectors.
Then buy the sticky tape and the putty or the mastic
You have to seal the connectors so no water can get in.. The foam dielectric is Hygroscopic - attracts water. If there is a gap in the tape large enough for one molecule of water to get in, the coax will attract it.
One thing to remember, if you loose half of your transmit power in the coax, you are also loosing half of your receive signal in the coax.
11 meters is not as lossy as 6, which is not as lossy as 2 meters, which is not as lossy as 70 cm.
If all you want to do is talk local, where the signals are very strong to start with, then it does not matter if you throw half of your signal away in the coax. But if you wanted to talk to someone in Australia or New Zealand or Japan, you would want to preserve as much of the signal as you could. |
Press_man
Advanced Member
Username: Press_man
Post Number: 769
Registered: 5-2008
| | Posted on Thursday, May 22, 2014 - 7:41 pm: |
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I prefer the 9913 coax, it's double shielded and the center is copper not copper clad aluminum. Just my 2 cents.
73 Pressman
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Dale
Senior Member
Username: Dale
Post Number: 2087
Registered: 12-2002
| | Posted on Friday, May 23, 2014 - 7:31 pm: |
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yess press man and solder on connections
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
|
