Post by thread:Radio Pager

Hi everyone, A customer has given me a small radio paging console to possibly modify. It contains a simple 27MHz transmitter and keypad/display driven by a 16C55. These units are normally used for small businesses and have a very short range. The pocket pager has an 18 pin PIC, a piezo and a single digit LED display. I need to make the console a bit more user friendly and add a couple of new functions. Has anyone seen these units around or played with them ? The PIC in the console just keys the 27MHz for data transmission. If someone knew the format used I could do some easy mods. The data rate is quite slow but does not look like anything obvious to me. I have captured the data waveforms for various key combinations but can't figure out the format. The origin looks Asian and I am led to believe that they are low in cost. Can anyone offer any advice on this ? Regards... ____________________________________ David Duffy, Audio Visual Devices Pty Ltd Ph: +61 7 38210362 Fax +61 7 38210281 spam_OUTAVDTakeThisOuTuq.net.au Unit 8, 9-11 Trade Street Cleveland, Qld, 4163, Australia. ____________________________________

David Duffy wrote: > > Hi everyone, > A customer has given me a small radio paging console to possibly modify. <<cut>> > key combinations but can't figure out the format. The origin looks Asian > and I am > led to believe that they are low in cost. Can anyone offer any advice on > this ? *D:\pic\pic archive 6 *D:\pic\pic archive 6 And will the possible customer be prepared to pay for LCD etc + a "reasonable" markup ? -- Steam engines may be out of fashion, but when you consider that an internal combustion engine would require recovery of waste heat by transfer just before top dead centre then fashion becomes rather redundant, USE STRATIFIED HEAT EXCHANGERS ! and external combustion. You heard it first from: Graham Daniel, managing director of Electronic Product Enhancements. Phone NZ 04 387 4347, Fax NZ 04 3874348, Cellular NZ 021 954 196.

Hi David, If the PIC is 16c55, then it is not 18 pin, it is 28 pin DIP 600 mil package. Send me the data format and I will try to figure it out. give me more details on the usage of the product. Bye Pailoor David Duffy wrote: {Quote hidden}> Hi everyone, > A customer has given me a small radio paging console to possibly > modify. > It contains a simple 27MHz transmitter and keypad/display driven by a > 16C55. > These units are normally used for small businesses and have a very > short > range. > The pocket pager has an 18 pin PIC, a piezo and a single digit LED > display. > I need to make the console a bit more user friendly and add a couple > of new > functions. Has anyone seen these units around or played with them ? > The PIC > in the console just keys the 27MHz for data transmission. If someone > knew the > format used I could do some easy mods. The data rate is quite slow but > does > not > look like anything obvious to me. I have captured the data waveforms > for > various > key combinations but can't figure out the format. The origin looks > Asian > and I am > led to believe that they are low in cost. Can anyone offer any advice > on > this ? > Regards... > ____________________________________ > David Duffy, Audio Visual Devices Pty Ltd > Ph: +61 7 38210362 Fax +61 7 38210281 > .....AVDKILLspam@spam@uq.net.au Unit 8, 9-11 Trade Street > Cleveland, Qld, 4163, Australia. > ____________________________________ -- Chip Technologies No. 70, 9th Main Road, Mathikere, Bangalore - 560 054. INDIA Tel : +91-80-3362807 Fax : +91-80-3369451 Email : chiptechKILLspamvsnl.com

At 09:15 PM 1/31/99 +1000, you wrote: >Hi everyone, >A customer has given me a small radio paging console to possibly modify. >It contains a simple 27MHz transmitter and keypad/display driven by a 16C55. >These units are normally used for small businesses and have a very short >range. >The pocket pager has an 18 pin PIC, a piezo and a single digit LED display. >I need to make the console a bit more user friendly and add a couple of new >functions. Has anyone seen these units around or played with them ? The PIC >in the console just keys the 27MHz for data transmission. If someone knew the >format used I could do some easy mods. The data rate is quite slow but does >not look like anything obvious to me. Probably POCSAG, though if it's old enough there are several other slower protocols possible too. >I have captured the data waveforms for >various key combinations but can't figure out the format. The origin looks Asian >and I am >led to believe that they are low in cost. Can anyone offer any advice on >this ? What's the make of the receivers ? I spend several years in Asia working on paging. Nic Nicholas Uloth Industrial Software Partners Ltd 6 The Promenade Mt Pleasant, Perth, WA 6153 Australia Phone: xxx-61-0418-902-724 Fax: xxx-618-9481-7202 eMail: .....niculothKILLspam.....iohk.com

David Duffy wrote: > It contains a simple 27MHz transmitter and keypad/display driven by a > 16C55. > The pocket pager has an 18 pin PIC, a piezo and a single digit LED > display. Paul B. Webster wrote: > First and single most important question: Are they code protected? The 18 pin one in the pocket pager is - I just *had* to try ! I imagine the 16C55 in console is also protected - haven't checked it yet. Regards... ____________________________________ David Duffy, Audio Visual Devices Pty Ltd Ph: +61 7 38210362 Fax +61 7 38210281 EraseMEAVDspam_OUTTakeThisOuTuq.net.au Unit 8, 9-11 Trade Street Cleveland, Qld, 4163, Australia. ____________________________________

David Duffy wrote: > A customer has given me a small radio paging console to possibly modify. > <<cut>> > key combinations but can't figure out the format. The origin looks Asian > and I am > led to believe that they are low in cost. Can anyone offer any advice on > this ? *D:\pic\pic archive 6 *D:\pic\pic archive 6 Graham Daniel wrote: > And will the possible customer be prepared to pay for LCD etc + a > "reasonable" markup ? Not sure how much he wants to spend yet - depends on what he wants. The existing keypad/display is OK. He needs some remote buttons,etc and possibly for it to auto-call certain pagers when triggered. Regards... ____________________________________ David Duffy, Audio Visual Devices Pty Ltd Ph: +61 7 38210362 Fax +61 7 38210281 AVDspam_OUTuq.net.au Unit 8, 9-11 Trade Street Cleveland, Qld, 4163, Australia. ____________________________________