CloudACM

Identifying RF Channels to monitor can be a time consuming effort. Using a standard non PC radio receiver can take a long time to identify a transmitting channel. Using RTL_Power and SDR FFT Spectrum Logging provided here (http://kmkeen.com/rtl-power/), makes the effort less challenging. RTL_Power will sweep through a range of radio frequencies at given steps and log the RF power levels detected by the USB SDR receiver. It does this over and over at set intervals to create a log…

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In this post I’ll be giving some background and install steps on RTL-SDR. SDR stands for software defined radio and has been in use since the 1970s. Traditional radio processing is handled by hardware components like oscillators, regulators, and mixers. SDR replaces these functions with digital computer processing. RTL-SDR is a device that was originally designed to receive digital television transmissions, namely DVB-T TV using the RTL2832U chipset. The device is typically contained in a USB dongle. The RTL2832U chipset…

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Dual Tone Multi Frequency signaling, commonly referred to as DTMF, is mainly used for phone dialing systems. But this isn’t the only use for DTMF signaling. Another common use is security access systems. In this post, I’ll be covering how to decode DTMF using MultiMon-NG. SoX will be used to record the DTMF signals generated on cell phones and keyless entry systems. I’ll be using a high gain directional microphone with a secondary microphone to cancel out background noise. SoX…

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