OK, now I get what you are after. 75ohm cable will cause an impedance mismatch resulting is much higher losses that 50 ohm cable of the same length. You can add a transformer that will match 50 Ohm to 75 Ohm cable, here are a couple of examples: http://www.ham-radio.com/k6sti/match.htm.
You will not damage the radio though, we are not running high enough power to cause enough VSWR to make any real heat. - Jerry -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Paolo Di Francesco Sent: Monday, August 30, 2010 3:40 PM To: WISPA General List Subject: Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable well, just using the usual things for non usual situations. I was considering: if I have to do more than 100 meters ethernet what would I use? well 100m of LMR400 can be a solution in some cases (yeah I know fiber, but as I said I was curious about RF cables). In a previous post I saw somebody talking about ethernet over coaxial, so this is like the same, but with no copper/RJ45 connector. It's directly into the router. I am not looking for speed, I was considering that even with 200m or 300m LMR400 cables you could do the same job. Thank you > I must be missing something. I can't fiure out why you would connect two > radios together for any reason other than to bench test. > > > - Jerry > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Paolo Di Francesco > Sent: Monday, August 30, 2010 2:04 PM > To: WISPA General List > Subject: Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable > > well, why not? :) > > I don't know if the attenuator would change the impedance story. > > >> Why would you do that? >> >> for bench testing I could see using a section of Coax with an attenuator >> inline. >> >> - Jerry >> >> >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >> Behalf Of Paolo Di Francesco >> Sent: Monday, August 30, 2010 1:51 PM >> To: WISPA General List >> Subject: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable >> >> Hi all >> >> I was wondering if directly connecting two wireless cards would burn >> them. The point is not the power sent by the two cards, but if the >> impedance is not the right one. >> >> Indeed in the "normal use" with the antenna the impedance is not the >> same of using a direct cable from one card to another. Not sure what >> impedance the "RX" card would show to the "TX" card >> >> Any idea? I am quite curious. Anybody using this configuration in daily >> installations? >> >> Thank you >> >> > > -- Ing. Paolo Di Francesco Teleinform s.r.l. Sede Legale: Via Francesco Paolo Di Blasi 1, 90144 Palermo Unita' Operativa: Via Regione Siciliana 49, 90046 Monreale (Palermo) Tel: +39-091-6408576, +39-091-6404501 Fax: +39-091-6406200 http://www.wikitel.it http://www.teleinform.com -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
