Decoding Flex 1600 Pager Traffic with SDR# & PDW

NeedSec just posted on YouTube a video illustrating how to use a RTL-SDR to decode Flex 1600 pager traffic using PDWVB-Cable and SDR#. It is always surprising there is still pager traffic as when is the last time you can remember seeing someone with a pager in public. We’ve shared videos showing this sort of thing before, but NeedSec gives a great overview of what you need to do to accomplish successful decoding of Flex-1600.


Alternative ExtIO for Compatible SDR Software

The folks over at SDR# have uploaded an updated plugin for ExtIO compatible software.

You can download your copy from [LINK REMOVED – it appears SDR# has removed the file]

To use it, extract to the same folder as SDR#/HDSDR/WRPlus/etc and select the ExtIO_RTLSDR.dll depending on your software instructions. (HDSDR will prompt you which ExtIO plugin you want to use if you already have another ExtIO DLL installed.)

SDR# With RTL-SDR Support

“SDR# (read SDR Sharp) is a simple, intuitive, small and fast PC-based DSP application for Software Defined Radio. It’s written in C# with both object design correctness and performance in mind. The main purpose is to offer a simple proof of concept application to get hands into DSP techniques. It supports SoftRock, FiFiSDR, FUNcube Dongle, SDR-4 [,rtl-sdr] and any sound card based SDR front end.” —


SDR# (SDR-Sharp) versions 244+ (dev) have added support for RTL based SDRs supported by ExtIO. Extract the download link to the same folder you installed ExtIO to. If you haven’t done that yet, try this guide.

Download Link

To use the software with an RTLSDR dongle, Select USRP under the ‘Front End’ drop down box beside the Front End button. Then use the now active ‘Front End’ button to show the ExtIO GUI. Don’t forget to add your device hint!

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