Anybody know if you could use this weather-resistant 75 Ohm2200 Mhz RG-6 TV Coax for like maybe a mountain line installation from the antenna to the base?
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75 Ohm 2200 Mhz RG-6 TV Coax
- Thread starter ctvanover
- Start date
Yes, you can, but you must use proper coax length to transfer impedance from one of it's ends to another without influence of coax.
MIke
MIke
You could but there are better ways to do it especially if the cable run is several hundred feet. Even RG-6 is quite lossy when you are talking several hundred feet of it.Open wire or ladder line with impedance matching transformers at each end are much better.
I didn't know. I kinda found a 1000 ft. roll of this weather-resistant 75 Ohm2200 Mhz RG-6 TV Coax at a fairly decent price with free shipping. A buddy of mine told me to go to the cable company and ask them for their used coax to be used for a cb mountain line. He said I should be able to get it fairly cheap, it's weather resistant, and it already has the ends on it to connect it together if it's going to be a long way up the hill.
I'd say it's probably 500 to a 1000 ft, give or take a bit, to the top of the hill where I live. Where can I find the open wire or ladder line? What and where can I find the impedance matching transformers?
Any and all help is greatly appreciated.
THANKS!
RG-6 is what is called "drop line". It is the stuff the cable company runs in from the pole to your house and is fine for that as the run is not very long. The stuff your buddy is talking about getting from the cable company is called "trunk line" and is what they run from pole-pole along the street. It is much larger and has much less lose than drop line. It is generally fairly stiff and has a solid aluminum outer shield and is what would be better suited for what you have in mind.
Yeah, that's what I'm talking about. So if I could get some of that "trunk line" it would work for what I need? Any idea how I should go about it?
One way of going about it is to use two 50 ohm/75 ohm 'unun's for matching to 50 ohm source and load (same things an a balun except is doesn't do any 'balancing', just impedance transformation). How you would run the thing would be up to you and the situation. Hang it from something, bury it, or just leave it laying on the ground.
If it's the 1/2" cable, a double female adaptor can be used to make connections. Not the 'best' way, but certainly cheaper than finding/buying the proper connectors. That also means doing some weather sealing.
As far as -getting- that cable, you have a choice of giving an arm and leg to the cable company, or scavenging a few of their 'spool-ends'. Or, see if they plan on making any cable replacements any time soon. Tell them you'd haul all that replaced cable off if they'd let you have it. Whatever...
- 'Doc
If it's the 1/2" cable, a double female adaptor can be used to make connections. Not the 'best' way, but certainly cheaper than finding/buying the proper connectors. That also means doing some weather sealing.
As far as -getting- that cable, you have a choice of giving an arm and leg to the cable company, or scavenging a few of their 'spool-ends'. Or, see if they plan on making any cable replacements any time soon. Tell them you'd haul all that replaced cable off if they'd let you have it. Whatever...
- 'Doc
You might find someone to drive into a pole and knock down however much you need. Works for coconuts!:laugh:
Most definitely. It is called shielded balanced line. You could just use two equal lengths of the same type of coax cable and join the shields at the antenna end but do not hook them to anything else. Connect the shields together at the shack end and ground it there. The resulting impedance is twice the coax impedance ie RG59 would yield about 150 ohm feedline. The higher the coax impedance the better.
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