COMEBACK EDITIONWhat is SDR?>Software-defined radio (SDR) is a radio communication system where components that have been traditionally implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system. While the concept of SDR is not new, the rapidly evolving capabilities of digital electronics render practical many processes which were once only theoretically possible.>A basic SDR system may consist of a personal computer equipped with a sound card, or other analog-to-digital converter, preceded by some form of RF front end. Significant amounts of signal processing are handed over to the general-purpose processor, rather than being done in special-purpose hardware (electronic circuits). Such a design produces a radio which can receive and transmit widely different radio protocols (sometimes referred to as waveforms) based solely on the software used. >https://en.wikipedia.org/wiki/Software-defined_radioWhat is an RTL-SDR?>RTL-SDR is a very cheap ~$30 USB dongle that can be used as a computer based radio scanner for receiving live radio signals in your area (no internet required). Depending on the particular model it could receive frequencies from 500 kHz up to 1.75 GHz. Most software for the RTL-SDR is also community developed, and provided free of charge. Note that RTL-SDRs cannot transmit. >https://www.rtl-sdr.com/about-rtl-sdr/RTL-SDR Guides>https://www.rtl-sdr.com/rtl-sdr-quick-start-guide/>https://fromdc2daylight.com/a-beginners-guide-to-software-defined-radios/
>>100170041What is Meshtastic>Meshtastic® is a project that enables you to use inexpensive LoRa radios as a long range off-grid communication platform in areas without existing or reliable communications infrastructure. This project is 100% community driven and open source!>https://meshtastic.org/docs/introduction/What is a HackRF>HackRF One is a Software Defined Radio peripheral capable of transmission or reception of radio signals from 1 MHz to 6 GHz. Designed to enable test and development of modern and next generation radio technologies, HackRF One is an open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. >https://greatscottgadgets.com/hackrf/one/Some info on antennas>https://xroadgps.com/ham-radio-antenna-types/Find radio frequencies around you>https://www.radioreference.com/db/Cheap handheld radio>https://baofengtech.com/product/uv-5r/Cheap SDR USB dongle>https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/Download software to use with your RTL-SDR or HackRF>https://www.sdrpp.org/>https://www.gqrx.dk/
