* two way radio @ 2010-11-18 11:07 Eduardo 2010-11-18 12:15 ` Nate Bargmann 2010-11-18 14:15 ` John Goerzen 0 siblings, 2 replies; 9+ messages in thread From: Eduardo @ 2010-11-18 11:07 UTC (permalink / raw) To: linux-hams Hi, I have a pretty basic question. Is it possible to connect a two way radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm ) to a Linux box? Does anyone know a good reference explaining how to make this connection? Thanks in advance, Eduardo ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: two way radio 2010-11-18 11:07 two way radio Eduardo @ 2010-11-18 12:15 ` Nate Bargmann 2010-11-18 14:50 ` Eduardo 2010-11-18 14:15 ` John Goerzen 1 sibling, 1 reply; 9+ messages in thread From: Nate Bargmann @ 2010-11-18 12:15 UTC (permalink / raw) To: linux-hams * On 2010 18 Nov 05:09 -0600, Eduardo wrote: > Hi, > > I have a pretty basic question. Is it possible to connect a two way > radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm > ) to a Linux box? Does anyone know a good reference explaining how to > make this connection? To do what? As it is an FRS radio I doubt that anything but voice is allowed, at least in the USA. Outside the USA you may be able to use data of some sort, depending on your local regulations. To do that you would likely connect the speaker/mic jack to the audio connections on a sound card. Looking at the specs I doubt there is any way to connect the radio for frequency/channel selection. 73, de Nate >> -- "The optimist proclaims that we live in the best of all possible worlds. The pessimist fears this is true." Ham radio, Linux, bikes, and more: http://n0nb.us/index.html ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: two way radio 2010-11-18 12:15 ` Nate Bargmann @ 2010-11-18 14:50 ` Eduardo 2010-11-18 16:35 ` Robert Eliassen 0 siblings, 1 reply; 9+ messages in thread From: Eduardo @ 2010-11-18 14:50 UTC (permalink / raw) To: linux-hams Hi Nate / John, Thanks for your replay. What (cheap) radio would you recommend to transmit data? Could you also point a place where I can find the circuit needed to connect this radio to a Linux box? Best regards, Eduardo On Thu, Nov 18, 2010 at 10:15 AM, Nate Bargmann <n0nb@n0nb.us> wrote: > * On 2010 18 Nov 05:09 -0600, Eduardo wrote: >> Hi, >> >> I have a pretty basic question. Is it possible to connect a two way >> radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm >> ) to a Linux box? Does anyone know a good reference explaining how to >> make this connection? > > To do what? As it is an FRS radio I doubt that anything but voice is > allowed, at least in the USA. Outside the USA you may be able to use > data of some sort, depending on your local regulations. To do that you > would likely connect the speaker/mic jack to the audio connections on a > sound card. Looking at the specs I doubt there is any way to connect > the radio for frequency/channel selection. > > 73, de Nate >> > > -- > > "The optimist proclaims that we live in the best of all > possible worlds. The pessimist fears this is true." > > Ham radio, Linux, bikes, and more: http://n0nb.us/index.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: two way radio 2010-11-18 14:50 ` Eduardo @ 2010-11-18 16:35 ` Robert Eliassen 2010-11-18 17:31 ` Eduardo 2010-11-18 18:54 ` Gordon JC Pearce 0 siblings, 2 replies; 9+ messages in thread From: Robert Eliassen @ 2010-11-18 16:35 UTC (permalink / raw) To: linux-hams Eduardo, You still have to explain what your intentions are. Are you going to use the FRS/GMRS-radio to transmit and receive data? PTT (Push To Talk) would be the trickiest part I guess. You may have to modify the unit. Regards Bob, LA6GHA -----Original Message----- From: linux-hams-owner@vger.kernel.org [mailto:linux-hams-owner@vger.kernel.org] On Behalf Of Eduardo Sent: 18. november 2010 15:51 To: linux-hams@vger.kernel.org Subject: Re: two way radio Hi Nate / John, Thanks for your replay. What (cheap) radio would you recommend to transmit data? Could you also point a place where I can find the circuit needed to connect this radio to a Linux box? Best regards, Eduardo On Thu, Nov 18, 2010 at 10:15 AM, Nate Bargmann <n0nb@n0nb.us> wrote: > * On 2010 18 Nov 05:09 -0600, Eduardo wrote: >> Hi, >> >> I have a pretty basic question. Is it possible to connect a two way >> radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm >> ) to a Linux box? Does anyone know a good reference explaining how to >> make this connection? > > To do what? As it is an FRS radio I doubt that anything but voice is > allowed, at least in the USA. Outside the USA you may be able to use > data of some sort, depending on your local regulations. To do that you > would likely connect the speaker/mic jack to the audio connections on a > sound card. Looking at the specs I doubt there is any way to connect > the radio for frequency/channel selection. > > 73, de Nate >> > > -- > > "The optimist proclaims that we live in the best of all > possible worlds. The pessimist fears this is true." > > Ham radio, Linux, bikes, and more: http://n0nb.us/index.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: two way radio 2010-11-18 16:35 ` Robert Eliassen @ 2010-11-18 17:31 ` Eduardo 2010-11-18 20:41 ` Robert Eliassen 2010-11-18 18:54 ` Gordon JC Pearce 1 sibling, 1 reply; 9+ messages in thread From: Eduardo @ 2010-11-18 17:31 UTC (permalink / raw) To: Robert Eliassen; +Cc: linux-hams Hello Robert, I want to send commands (and receive status) to a Linux box. I am not quite sure what band I can use. I am in Brazil and I think (I'm not completely sure) that I can use CB here for that. Regards, Eduardo On Thu, Nov 18, 2010 at 2:35 PM, Robert Eliassen <robel@vktv.no> wrote: > Eduardo, > > You still have to explain what your intentions are. Are you going to use the > FRS/GMRS-radio to transmit and receive data? > > PTT (Push To Talk) would be the trickiest part I guess. You may have to > modify the unit. > > Regards > Bob, LA6GHA > > -----Original Message----- > From: linux-hams-owner@vger.kernel.org > [mailto:linux-hams-owner@vger.kernel.org] On Behalf Of Eduardo > Sent: 18. november 2010 15:51 > To: linux-hams@vger.kernel.org > Subject: Re: two way radio > > Hi Nate / John, > > Thanks for your replay. > > What (cheap) radio would you recommend to transmit data? Could you > also point a place where I can find the circuit needed to connect this > radio to a Linux box? > > Best regards, > Eduardo > > On Thu, Nov 18, 2010 at 10:15 AM, Nate Bargmann <n0nb@n0nb.us> wrote: >> * On 2010 18 Nov 05:09 -0600, Eduardo wrote: >>> Hi, >>> >>> I have a pretty basic question. Is it possible to connect a two way >>> radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm >>> ) to a Linux box? Does anyone know a good reference explaining how to >>> make this connection? >> >> To do what? As it is an FRS radio I doubt that anything but voice is >> allowed, at least in the USA. Outside the USA you may be able to use >> data of some sort, depending on your local regulations. To do that you >> would likely connect the speaker/mic jack to the audio connections on a >> sound card. Looking at the specs I doubt there is any way to connect >> the radio for frequency/channel selection. >> >> 73, de Nate >> >> >> -- >> >> "The optimist proclaims that we live in the best of all >> possible worlds. The pessimist fears this is true." >> >> Ham radio, Linux, bikes, and more: http://n0nb.us/index.html >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-hams" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: two way radio 2010-11-18 17:31 ` Eduardo @ 2010-11-18 20:41 ` Robert Eliassen 0 siblings, 0 replies; 9+ messages in thread From: Robert Eliassen @ 2010-11-18 20:41 UTC (permalink / raw) To: 'Eduardo'; +Cc: linux-hams Ah, so you're like going to telnet into a Linux box via radio! Ok, so the clue here is "I want to control my Linux box 20 miles away, and there is no other way but via radio". The good news is that dual-mode GMRS/FRS equipment is approved in Brazil according to http://en.wikipedia.org/wiki/Family_Radio_Service When it comes to legal modifications and the legal use of data communication you should Google (in you language) for answers. Assuming it's legal, the rest is pretty straight forward. You can check out http://www.faqs.org/docs/Linux-HOWTO/AX25-HOWTO.html although it's pretty old. 73 Bob, LA6GHA -----Original Message----- From: linux-hams-owner@vger.kernel.org [mailto:linux-hams-owner@vger.kernel.org] On Behalf Of Eduardo Sent: 18. november 2010 18:31 To: Robert Eliassen Cc: linux-hams@vger.kernel.org Subject: Re: two way radio Hello Robert, I want to send commands (and receive status) to a Linux box. I am not quite sure what band I can use. I am in Brazil and I think (I'm not completely sure) that I can use CB here for that. Regards, Eduardo On Thu, Nov 18, 2010 at 2:35 PM, Robert Eliassen <robel@vktv.no> wrote: > Eduardo, > > You still have to explain what your intentions are. Are you going to use the > FRS/GMRS-radio to transmit and receive data? > > PTT (Push To Talk) would be the trickiest part I guess. You may have to > modify the unit. > > Regards > Bob, LA6GHA > > -----Original Message----- > From: linux-hams-owner@vger.kernel.org > [mailto:linux-hams-owner@vger.kernel.org] On Behalf Of Eduardo > Sent: 18. november 2010 15:51 > To: linux-hams@vger.kernel.org > Subject: Re: two way radio > > Hi Nate / John, > > Thanks for your replay. > > What (cheap) radio would you recommend to transmit data? Could you > also point a place where I can find the circuit needed to connect this > radio to a Linux box? > > Best regards, > Eduardo > > On Thu, Nov 18, 2010 at 10:15 AM, Nate Bargmann <n0nb@n0nb.us> wrote: >> * On 2010 18 Nov 05:09 -0600, Eduardo wrote: >>> Hi, >>> >>> I have a pretty basic question. Is it possible to connect a two way >>> radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm >>> ) to a Linux box? Does anyone know a good reference explaining how to >>> make this connection? >> >> To do what? As it is an FRS radio I doubt that anything but voice is >> allowed, at least in the USA. Outside the USA you may be able to use >> data of some sort, depending on your local regulations. To do that you >> would likely connect the speaker/mic jack to the audio connections on a >> sound card. Looking at the specs I doubt there is any way to connect >> the radio for frequency/channel selection. >> >> 73, de Nate >> >> >> -- >> >> "The optimist proclaims that we live in the best of all >> possible worlds. The pessimist fears this is true." >> >> Ham radio, Linux, bikes, and more: http://n0nb.us/index.html >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-hams" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-hams" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: two way radio 2010-11-18 16:35 ` Robert Eliassen 2010-11-18 17:31 ` Eduardo @ 2010-11-18 18:54 ` Gordon JC Pearce 1 sibling, 0 replies; 9+ messages in thread From: Gordon JC Pearce @ 2010-11-18 18:54 UTC (permalink / raw) To: Robert Eliassen; +Cc: linux-hams On Thu, 2010-11-18 at 17:35 +0100, Robert Eliassen wrote: > Eduardo, > > You still have to explain what your intentions are. Are you going to use the > FRS/GMRS-radio to transmit and receive data? > > PTT (Push To Talk) would be the trickiest part I guess. You may have to > modify the unit. > > Regards > Bob, LA6GHA Most of these wee cheapy radios have a stereo 2.5mm or 3.5mm jack socket with an earphone pin, a mike pin and ground. To put them into transmit, you connect a smallish resistor (typically 1k or so) across the electret mike element. The PTT circuit in the radio looks to see if you've pulled the mike line down - not totally to ground, but typically to about 1.5 to 3V - and switches to transmit. As other posters have said, there may be legal issues with using unlicensed radios for data comms. If you're controlling a remote PC, you may also find that you want to encrypt your traffic - except with an amateur licence you can't. Owing to the legal aspects, I can't recommend that you use these radios - if you get caught you could be in quite a lot of legal trouble, assuming your local equivalent of Ofcom aren't too busy catching pirate FM stations. Gordon MM0YEQ ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: two way radio 2010-11-18 11:07 two way radio Eduardo 2010-11-18 12:15 ` Nate Bargmann @ 2010-11-18 14:15 ` John Goerzen 2010-11-18 16:19 ` Dave Platt 1 sibling, 1 reply; 9+ messages in thread From: John Goerzen @ 2010-11-18 14:15 UTC (permalink / raw) To: Eduardo; +Cc: linux-hams On 11/18/2010 05:07 AM, Eduardo wrote: > Hi, > > I have a pretty basic question. Is it possible to connect a two way > radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm > ) to a Linux box? Does anyone know a good reference explaining how to > make this connection? You'll need: 1) A way to get sound from the computer to the radio 2) A way to get sound from the radio to the computer 3) A way to key PTT from the computer. #1 and #2 may be solved easily if it has headphone and mic jacks. #3 may be more complicated, though you may be able to use VOX. The precise circuits needed vary by radio. -- John ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: two way radio 2010-11-18 14:15 ` John Goerzen @ 2010-11-18 16:19 ` Dave Platt 0 siblings, 0 replies; 9+ messages in thread From: Dave Platt @ 2010-11-18 16:19 UTC (permalink / raw) To: John Goerzen; +Cc: Eduardo, linux-hams >> I have a pretty basic question. Is it possible to connect a two way >> radio (like https://cobra.com/detail/microtalk-cxr925-35-mile-radio.cfm >> ) to a Linux box? Does anyone know a good reference explaining how to >> make this connection? > > You'll need: > > 1) A way to get sound from the computer to the radio > 2) A way to get sound from the radio to the computer > 3) A way to key PTT from the computer. > > #1 and #2 may be solved easily if it has headphone and mic jacks. #3 may be more complicated, though you may be able to use VOX. The precise circuits needed vary by radio. Here in the U.S. you have to be careful in what you do along these lines due to the FCC regulations which govern FRS radio use. - You may not make any internal mofifications of the radio at all. - You may not interconnect to the telephone network - Voice use only, with very limited exceptions for very specific forms of data transmission - Two-way person to person communications only, again with limited exceptions. No one-way (broadcasting) allowed. Within those limitations, though, is is as you say. A radio prewired with a jack or jacks for an external speaker-mike with PTT switch or VOX would be a good choice, as it would not require internal modifications to be hooked up to a PC sound interface via e.g. a Buxcomm RASCAL or similar devicr (isolation transformers, pad resistors, and a PTT drive circuit, all easy to homebrew). ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2010-11-18 20:41 UTC | newest] Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2010-11-18 11:07 two way radio Eduardo 2010-11-18 12:15 ` Nate Bargmann 2010-11-18 14:50 ` Eduardo 2010-11-18 16:35 ` Robert Eliassen 2010-11-18 17:31 ` Eduardo 2010-11-18 20:41 ` Robert Eliassen 2010-11-18 18:54 ` Gordon JC Pearce 2010-11-18 14:15 ` John Goerzen 2010-11-18 16:19 ` Dave Platt
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