PDW This is the best program to date as development has been continued through to Windows XP. Requires an interface or sound card. PDW is freeware!! Streaming tenggelamnya kapal van der wick. Feb 23, 2006  The pager uses a protocol named POCSAG or Post Office Code Standardization Advisory Group code. If you search Google for POCSAG Encoder/Decoder, you will find many devices from various companies. This article is an effort for doing the same task using only software code.

Decoder

An NEC pager, using POCSAG coding branded for the Skyper network POCSAG is an asynchronous protocol used to transmit data to. The name is an of the Post Office Code Standardisation Advisory Group, the name of the group that developed the code under the chairmanship of the British that used to operate most telecommunications in Britain before privatization. Before the development and adoption of the POCSAG code, pagers used one of several proprietary codes such as GOLAY, (). In the 1990s new paging codes were developed that offered higher data transmission rates and other advanced features such as European and Network roaming.

The POCSAG code is generally transmitted at one of three data rates; 512, 1200 or 2400 bits per second. With Super-POCSAG 1200 bits per second, or 2400 bits per second transmission rates are possible. Super-POCSAG has mostly displaced the POCSAG in the developed world but the transition is still in progress.

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Preamble Please note, if you are based in the UK please read and understand Section 48 of the UK Wireless Telegraphy Act 2006: After purchasing an USB RTL2832 based dongle for use with my RPi to receive ADS-B messages from aircraft I was annoyed that I had purchased one that was unable to tune to the higher frequencies needed, so I looked for something to do with it whilst a E4000 based one turned up. You can find a list of compatible devices and places to buy them on the rtl-sdr wiki: From Wikipedia. NMR_Supply_Air_Hum Status: NMR BUILDING SUPPLY AIR RH It's also very easy to receive, even with a crappy aerial. It's a lot easier to find POCSAG frequencies using a waterfall display app and a laptop/desktop PC, I used a Windows laptop with SDRSharp. For Linux desktops, multimode from gnu-radio is also good; Set your chosen waterfall app to to 'WFM' mode and have a hunt around until you find something that sounds like POCSAG. A lot of digital signals sound similar, there's a few example audio files here: It's *possible* to run rtl_tcp on the rpi to transfer the data over a network connection and use the rtl_tcp input on SDRSharp/multimode but I found my wireless card caused pops and dropouts. It's much easier to just plug the dongle into the desktop but if you have a better network situation than me you might want to try.

Code: sudo apt-get -y install lighttpd sudo mkdir -p /var/www/pager/ sudo chmod 777 /var/www/pager/ rtl_fm -f 153.350M -s 22050 multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -f alpha /dev/stdin >> /var/www/pager/153-350M.txt You should be able to open in a browser. A very cool idea would be to control the Pi via the pager network, but unfortunately I do not have a pager I would be very interested to hear from anybody using multimonNG to decode something other than POCSAG and ADS-B! Useful links: Attachments Script to fetch and build rtlsdr and MultimonNG (322 Bytes) Downloaded 723 times. I just had to reimage my RPi again after the dreaded filesystem corruption and came here to grab my script and just noticed all the replies, sorry it's taken me a while: I used the default Raspbian image for mine and that is what my script is based around, although it should work on any distro, it's just grabbing and compiling software. For those who aren't getting decodes, there's a few reasons why: 1. It's not POCSAG1200 I think in my example multimon is only set to listen to the higher speed version of POCSAG, if you have a look at the help for multimon you can set up other decoders to run at the same time, such as POCSAG512 or POCSAG2400. Also a lot of digital signals sound similar, so double check it *is* actually POCSAG you are receiving.