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Thread: 50Ω VS 75Ω
02-29-2012 09:55 PM #1
50Ω VS 75Ω
I am going to be putting up a tower at my cottage in about a month from now. I will be installing an onmidirectional WIFI antenna and a discone scanner antenna. I know that the impedance of these antennas is 50Ω. My dilema is that I have several hundred feet of RG-11 left over from a MDU install, which of course is 75Ω, that I would like to use.
The research that I have done shows that the difference between these cables would be negligible on receive. This would be ok on the discone but the WIFI antenna both transmits and receives.
I would appreciate any feedback.
02-29-2012 10:36 PM #2
"The research that I have done shows that the difference between these cables would be negligible on receive." - if you mean attenuation, then it will be not enough.
It will bring much more issues as reflections and you'll lost a lot of signal.
There is a method of matching impedance, but it will cost you for two of them - on each side of RG-11 chunk.
03-07-2012 08:23 AM #3Pub Member / Supporter
Here's one link that might help. Although at these frequencies the matching sections would be mighty short and we're talking minimum 4 extra connectors. I'm guessing the height of the antenna would trump the (close to 2:1) SWR, but the length of the coax run would trump any overall gain.
Could you possibly use a USB wireless NIC up on the tower and connect it to your home system with a usb to cat5 cable setup?
Using CATV Hardline for ham radio antennas
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Last edited by jpmarto; 03-07-2012 at 08:28 AM.
03-13-2012 04:50 PM #4SatelliteGuys Regular
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Thanks for the great info guys! I think I will bite the bullet and buy the 50 ohm. Anyone want to buy a few hundred feet of RG-11?
03-13-2012 05:12 PM #5
I would but the shipping would kill meMichael
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03-15-2012 08:23 PM #6
Lets see: 12 Foot Unimesh, 1.2 meter Fortec on a HH motor, Chapparel dual c-band feed with a pair of Norsat 8115's. Dual feed Ku LNBF, Zinwell4x8 multi switch, C-band power inserter,main recievers are Alien2,X2 Premium HD,Prof7301,Openbox s9, microHD,and a DSR 922 to move the Unimesh and grab a few DCII signals here and there.