Are you sick of giving paging services your hard earned money just so you can receive pages? Well then, now you can build your own paging network.
Follow These Simple Instructions
- Get the PE-300 POCSAG encoding program for DOS and play around with it.
- Get the PD-204 POCSAG decoding program for DOS and play around with it.
- Get a big old commercial VHF/UHF radio that is capable of transmitting +/- 4.5 kHz frequency shift keyed (FSK) data. Don't forget the antenna and stuff.
- Hook your computer to the radio using this circuit. All the parts are available from Radio Shack.
- All control lines into the computer should have RF bypass caps and/or ferrite beads on them. This is not shown in the schematic, same for the modulation lines.
- You'll need an oscilloscope to check that your square waves are clean. Check output level by monitoring the discriminator tap of a receiver or scanner.
- The Push-To-Talk (PTT) key circuit won't work for all radios. Experiment.
- Try to send and decode some test pages. Use 512 bps speed rates and first to try and avoid any errors that will occur if your transmitter can't handle being FSK'ed that fast.
- You'll need to re-crystal or re-program your pager if you choose to use a commercially made one.
These radio are capable of being FSK'ed real hard.
- Alinco DR-1200 Data Radio
- GE Mastr Executive II, VHF and UHF
- GE Custom MVP, VHF and UHF
- Icom IC series: 25, 38, 228, 271, 290, 471
- Kenwood TM series: 211, 212, 221, 231, 431
- Kenwood TS series: 700, 770
- Coldsolderjoint'ola Mitrek, Maxar
- MFJ Model 8621 VHF Data Radio
- Standard C58, C140
- Yaesu FT series: 212, 221, 230
Bravo Plus Receiver Board Part Numbers
138 - 143 MHz AARD4050A 138 - 143 MHz NRD7211A,B 143 - 148.6 MHz AARD4051A 143 - 148.6 MHz NRD7212A,B 148.6 - 152 MHz AARD4052A 148.6 - 152 MHz NRD7213A,B 152 - 159 MHz AARD4053A
Pager Crystal Sources
Motorola Maxar Instructions
Modulation input: Bottom of radio, near front panel, locate () MOD printed on circuit board. Apply modulation input there. Ground: Use the chassis ground. Keying (PTT): Top of radio, near front panel, locate J2 solder pads (16 of them). Solder PTT wire to pin 4. Confirmed to work at 512, 1200 and 2400 bps.
Proper Pager Network Usage
- Get the capcode and frequency to the pager for your favorite system administator.
- Set your system up to transmit that same information.
- Spend all day sending anonymous messages saying online is down again.
- Barrels of fun!
- An Example Using Win32::Serialport to Chat With a Paging Service via a Modem
- Oliver A. Durm's Amateur Radio Pager Site
- Cool Homebrew Pager Stuff
- PE POCSAG Encoding Program, Version 2.01 (36k ZIP)
- PE Version 2.01 Crack
- PE Version 3.00 Quick Crack
- PE Web Page
- PD POCSAG Decoding Program, Version 1.02 No time limit. (34k ZIP)
- PIC-based POCSAG Pager Encoder (80k ZIP)
- PIC-based POCSAG Pager Decoder (41k ZIP)
- Pager Datasheets from Philips
- multimon - POCSAG / Data Decoder for Linux (50k Gzip TAR)
- RIC / Capcode Explained
- VHF/UHF Pager Frequencies for Brown County, Wisconsinn
- Dr. Who's Radiophone Archive Protocols, web interfaces, reprogramming info.
- TX 125 EN Pager Transmitter with Built-In Encoder
- Pager Handbook for the Radio Amateur by Phil Anderson, W0XI (282k PDF) (Hardcopy Version)
- 9/11 Tragedy Pager Intercepts
Failed Clown College