Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
And dont forget Lantastic! On Mon, Aug 30, 2010 at 7:29 PM, Mark Nash - Lists wrote: > arcnet, dude... > > - Original Message - > From: "Leon D. Zetekoff" > To: > Sent: Monday, August 30, 2010 4:27 PM > Subject: Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable > > > > On 08/30/2010 06:39 PM, Paolo Di Francesco wrote: > >> 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. > >> > > > > > > to show my age...ethernet started on coax; RG8/u (thick-net) or RG58/u > > (thin-net). 50 ohm terminators were on both sides. Connections were made > > with BNC or in the case of RG8 I think it was an AUI connector. BNC T > > connectors were used on each thin-net card. > > > > Also, who remember token-ring? I have a PCMCIA adapter for it. :-) > > > > Leon > > > > > > > > > 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/ > 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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
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 Leg
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! Join today!
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
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! 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/ 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/
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! 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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
arcnet, dude... - Original Message - From: "Leon D. Zetekoff" To: Sent: Monday, August 30, 2010 4:27 PM Subject: Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable > On 08/30/2010 06:39 PM, Paolo Di Francesco wrote: >> 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. >> > > > to show my age...ethernet started on coax; RG8/u (thick-net) or RG58/u > (thin-net). 50 ohm terminators were on both sides. Connections were made > with BNC or in the case of RG8 I think it was an AUI connector. BNC T > connectors were used on each thin-net card. > > Also, who remember token-ring? I have a PCMCIA adapter for it. :-) > > Leon > > > > 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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
On 08/30/2010 06:39 PM, Paolo Di Francesco wrote: > 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. > to show my age...ethernet started on coax; RG8/u (thick-net) or RG58/u (thin-net). 50 ohm terminators were on both sides. Connections were made with BNC or in the case of RG8 I think it was an AUI connector. BNC T connectors were used on each thin-net card. Also, who remember token-ring? I have a PCMCIA adapter for it. :-) Leon 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/
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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
We use the UNAT-30+ from Mini-Circuits (usually 3 stacked together) to test "bad" radios that come back, or for PtPs before we send them out. It has been helpful for tuning/benchmarking MikroTik wirelsss settings in a closed environment. http://www.minicircuits.com/cgi-bin/modelsearch?model=UNAT-30%2B&x=0&y=0 So far we haven't burned anything out. -Kristian On Mon, 2010-08-30 at 22:50 +0200, Paolo Di Francesco wrote: > 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 > > 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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
> It should all be 50 ohms, but you would need a big attenuator inline. so, there should not be a impedance problem, right? a big attenuator...hum...what about a loong cable? ;) Bye -- 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/
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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
The receiver impedance should match the cable impedance (50 ohms) for best receiver performance which the manufacturers are all trying to get. Also if the cable has enough attenuation to not burn up the receiver at the far end then even if there is a mismatch at the receiver on the far end the reflected power will be so highly attenuated by the time it arrives back at the transmitter it will be inconsequential. Greg On Aug 30, 2010, at 4:20 PM, Paolo Di Francesco wrote: > 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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
It should all be 50 ohms, but you would need a big attenuator inline. Cameron On Mon, Aug 30, 2010 at 3:50 PM, Paolo Di Francesco < paolo.difrance...@teleinform.com> wrote: > 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/
Re: [WISPA] (DIRECTLY) Connecting two wireless with a RF cable
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/
