I have a big box of new RG8 in the garage. I would use 900 MHz. The old Alvarion radios used transverters at 450 MHz and worked quite well using coax.
-----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of paolo.difrance...@teleinform.com Sent: Monday, August 30, 2010 8:11 PM To: WISPA General List Subject: Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable Well the fun starts with 2 cables and mimo cards, meaning more than 100Mbits at distances much higher than 100m. In theory it's 300Mbps halfduplex , but I guess it's more like >100Mbps full duplex. Ah, the TX card should shoot at power=0 (tx power in the mikrotik winbox). Not sure anybody tried it but I guess it could be much fun Bye > Actually, I think it's an innovative use. If you can afford the half > duplex > penalty it would be a great way to create a bridge. You could calculate > the > loss in 50 ohm coax of any size and length while adjusting the power > output > of the radios accordingly. I'd use 50 ohm cable, but even 75 ohm would > not > cause serious mismatch problems. If you do it, make a report! > > Mike > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Jerry Richardson > Sent: Monday, August 30, 2010 7:31 PM > To: WISPA General List > Subject: Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable > > 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! 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