Post by thread:[EE]: Cordless Phone Hack

I've got one here Harold H. is just gonna love. Anyone ever try hacking one of these 900 Mhz cordless phones for use as a wireless home data transmission network? The price is pretty hard to beat - $29. Heck, you could even stick the PIC inside the handset. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

Answer YES Data rate fixed at 300 baud (Internal signaling used to communicate data between the handset and the base) There is room to move this up to 1200baud with no major problems, as it just uses FM modulation for data. You will find some of this in the Motorola data sheets) Take a bit of work to get going, sometime I think that it is just best to let the handset do the comms, then use the intercomm function and send the data by normal FSK means) Some of the others are a bit smarter with wide band PSK links so that a resonable 12kbit link can be eatablished. Note that the handset does some bit stealing to make this work (Others use sub channels, but these are the somes that tend to drop out a bit) In all best just to use the RF front end, but the Audioline that I just recently attacked has this all as one ASIC (2 if you include the LCD controller) Note also that the hard work is done in the base station, this indicates that the link is not all that good for sending signalling! Hence not the best for data Dennis > {Original Message removed}

Dennis Plunkett wrote: >Answer YES >Data rate fixed at 300 baud (Internal signaling used to communicate data >between the handset and the base) There is room to move this up to 1200baud >with no major problems, as it just uses FM modulation for data. You will >find some of this in the Motorola data sheets) Take a bit of work to get >going, sometime I think that it is just best to let the handset do the >comms, then use the intercomm function and send the data by normal FSK >means) Some of the others are a bit smarter with wide band PSK links so that >a resonable 12kbit link can be eatablished. Note that the handset does some >bit stealing to make this work (Others use sub channels, but these are the >somes that tend to drop out a bit) > If I interpret this correctly, you are saying they use a narrow BW subband - probably at the low end - to multiplex data with the voice channel. Could you not connect a normal modem to the voice channel? Do you have the chip P/Ns? Sounds like Motorola something or other. - danM -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> Anyone ever try hacking one of these 900 Mhz cordless > phones for use as a wireless home data transmission > network? The price is pretty hard to beat - $29. Did you see the article in Circuit Cellar #121 about that topic? Examines Zilog's Wave modem chip and board. Bruce Cannon Style Management Systems http://siliconcrucible.com (510) 787-6870 1228 Ceres ST Crockett CA 94525 Remember: electronics is changing your world...for good! -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Bruce Cannon wrote: >> Anyone ever try hacking one of these 900 Mhz cordless >> phones for use as a wireless home data transmission >> network? The price is pretty hard to beat - $29. > >Did you see the article in Circuit Cellar #121 about that topic? Examines >Zilog's Wave modem chip and board. > Hi Bruce, Thanks for the reference. I looked it up and the article is mainly about the "Wave chip" Zilog has been developing for this type of app - data xmssn using spread spectrum techniques at 900 Mhz. Not very much about hacking cordless phones, unfortunately. Still looking. best regards, - dan michaels -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

On Tue, 19 Sep 2000 19:32:02 -0600 Dan Michaels <spam_OUToricomTakeThisOuTLYNX.SNI.NET> writes: > I've got one here Harold H. is just gonna love. > > Anyone ever try hacking one of these 900 Mhz cordless > phones for use as a wireless home data transmission > network? The price is pretty hard to beat - $29. > > Heck, you could even stick the PIC inside the handset. > > You're right! I love that idea, but, of course, the FCC would consider it as voiding the certification on the phone. It sure would be nice to have some wireless LAN stuff down in that price range, though. Harold FCC Rules Online at http://www.hallikainen.com/FccRules/ ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: dl.http://www.juno.com/get/tagj. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use .....listservKILLspam@spam@mitvma.mit.edu?body=SET%20PICList%20DIGEST

Harold H. wrote: >On Tue, 19 Sep 2000 19:32:02 -0600 Dan Michaels <oricomKILLspamLYNX.SNI.NET> >writes: >> I've got one here Harold H. is just gonna love. >> >> Anyone ever try hacking one of these 900 Mhz cordless >> phones for use as a wireless home data transmission >> network? The price is pretty hard to beat - $29. >> >> Heck, you could even stick the PIC inside the handset. >> >> > > You're right! I love that idea, but, of course, the FCC would consider >it as voiding the certification on the phone. It sure would be nice to >have some wireless LAN stuff down in that price range, though. > Hi Harold, What you bring up here is exactly why I was looking at doing a cordless phone hack - as opposed to stringing together some of the for-sale RF module bits and pieces. I figured if you tap into the cordless phone at the audio end with some kind of data modem, and leave the RF end untouched, then you are not really violating the FCC certification. Am I wrong??? regards, - Dan Michaels ============== -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use .....listservKILLspam.....mitvma.mit.edu?body=SET%20PICList%20DIGEST

Lawrence Lille wrote: >Hi Dan, > >What do you know about those "RF module bits and pieces"? Any sources? >What kind of price range? Have you used them with any success? > Haven't yet, but am appraising different options. So many different protocols popping up. I have been building a reference list to these modules on my site, see under "RF, IR, & Wireless": http://www.sni.net/~oricom/teklink2.htm The modules from Laipac look interesting, and cheap, for slower speed stuff. Also, checkout the new link to "Wireless Lan modems". regards, - Dan Michaels Oricom Technologies =================== -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu?body=SET%20PICList%20DIGEST

>I've got one here Harold H. is just gonna love. > >Anyone ever try hacking one of these 900 Mhz cordless >phones for use as a wireless home data transmission >network? The price is pretty hard to beat - $29. > >Heck, you could even stick the PIC inside the handset. Dan, Where do I buy these for $US29? Here the cheapest digital 900 MHz phones are about $NZ300 which converts to about $US120 at the current abysmal exchange rate. TIA Russell McMahon -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use listservspam_OUTmitvma.mit.edu?body=SET%20PICList%20DIGEST

Russell McMahon wrote: > >Where do I buy these for $US29? >Here the cheapest digital 900 MHz phones are about $NZ300 which converts to >about $US120 at the current abysmal exchange rate. > > Hi Russell, Was shopping at the local CompUSA [ChumpUSA???] store this week, looking at the Palm Pilots, saw the cordless phones and thought up the hack. Cheap basic models start at $29USD w/no frills, up to $150 or so with spread-spectrum, caller ID, dual lines, builtin answering machines, etc - certainly not needed. I also looked in the Radio Shack catalog, and their's are all much more - $70+ USD. Try the mail order guys. I believe CompUSA started as such. best regards, - Dan Michaels =============== -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use @spam@listservKILLspammitvma.mit.edu?body=SET%20PICList%20DIGEST

Harold Hallikainen wrote: > On Tue, 19 Sep 2000 19:32:02 -0600 Dan Michaels <KILLspamoricomKILLspamLYNX.SNI.NET> > writes: > > I've got one here Harold H. is just gonna love. > > > > Anyone ever try hacking one of these 900 Mhz cordless > > phones for use as a wireless home data transmission > > network? The price is pretty hard to beat - $29. > > > > Heck, you could even stick the PIC inside the handset. > > > > > > You're right! I love that idea, but, of course, the FCC would consider > it as voiding the certification on the phone. It sure would be nice to > have some wireless LAN stuff down in that price range, though. > > Harold If you just do an "Accoustical Coupler" type attachment you can probably get 14.4k or 28.8k baud, and the FCC has NOTHING they can say about that; It's a thought. (Most accoustical couplers are <ahem> sorta pricey, though. And good at listening to abmient noise. Used to have a friend who could whisthe his username and so on at 300 baud...) Mark -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

Mark, is this REALLY true? 300 baud sounds way too fast to be able to do that! I have a friend who, after a fair amount of trying, could make a modem (2400 I think) connect by just singing various nonsense syllables at different pitches into it, and then he could make it receive random characters, but I doubt that one could coordinate that. Sean At 11:57 PM 9/22/00 -0700, you wrote: >pricey, though. And good at listening to abmient noise. Used to have a >friend who could whisthe his username and so on at 300 baud...) > > Mark > >-- >http://www.piclist.com hint: To leave the PICList >spamBeGonepiclist-unsubscribe-requestspamBeGonemitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu

Hi Russell, I think he means an analog 900MHz phone (just bought one myself for normal phone usage). Sean At 10:37 PM 9/22/00 +1200, you wrote: {Quote hidden}>Dan, > >Where do I buy these for $US29? >Here the cheapest digital 900 MHz phones are about $NZ300 which converts to >about $US120 at the current abysmal exchange rate. > > > >TIA > > > > Russell McMahon -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

At 02:13 PM 9/23/00 -0400, you wrote: >Hi Russell, > >I think he means an analog 900MHz phone (just bought one myself for normal >phone usage). > 900Mhz "cordless" phone for short-range use between handset and base station, not "cellular" phone dialing into phone system. More fun with terminology. I was mining google.com for cordless+phone+hack, and could only uncover stuff about cellular hacking id'ed as "cordless". Who names these things, anyways? -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestEraseME.....mitvma.mit.edu

Never saw/heard him do it; was told by a few friends that he'd demonstrated it, much to their amazement. Fuzzy Logic wise, I'd say it's 70-75% true? They didn't pull lies too often. Mark Sean H. Breheny wrote: > Mark, is this REALLY true? 300 baud sounds way too fast to be able to do > that! I have a friend who, after a fair amount of trying, could make a > modem (2400 I think) connect by just singing various nonsense syllables at > different pitches into it, and then he could make it receive random > characters, but I doubt that one could coordinate that. > > Sean -- http://www.piclist.com hint: To leave the PICList EraseMEpiclist-unsubscribe-requestmitvma.mit.edu

I wonder if one of those throat singers from Tuva could do this?? Harold On Sat, 23 Sep 2000 12:43:41 -0400 "Sean H. Breheny" <RemoveMEshb7EraseMEEraseMECORNELL.EDU> writes: {Quote hidden}> Mark, is this REALLY true? 300 baud sounds way too fast to be able to > do > that! I have a friend who, after a fair amount of trying, could make > a > modem (2400 I think) connect by just singing various nonsense > syllables at > different pitches into it, and then he could make it receive random > characters, but I doubt that one could coordinate that. > > Sean > > At 11:57 PM 9/22/00 -0700, you wrote: > >pricey, though. And good at listening to abmient noise. Used to > have a > >friend who could whisthe his username and so on at 300 baud...) > > > > Mark > > > >-- > >http://www.piclist.com hint: To leave the PICList > >RemoveMEpiclist-unsubscribe-requestspam_OUTKILLspammitvma.mit.edu > > -- > http://www.piclist.com hint: To leave the PICList > RemoveMEpiclist-unsubscribe-requestTakeThisOuTspammitvma.mit.edu > > FCC Rules Online at http://www.hallikainen.com/FccRules/ ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: dl.http://www.juno.com/get/tagj. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's