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2. Antenna tuner - Wikipedia

   en.wikipedia.org/wiki/Antenna_tuner

   Transformers, autotransformers, and baluns are sometimes incorporated into the design of narrow band antenna tuners and antenna cabling connections. They will all usually have little effect on the resonant frequency of either the antenna or the narrow band transmitter circuits, but can widen the range of impedances that the antenna tuner can match, and/or convert between balanced and ...

3. List of amateur radio software - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_software

   software-defined radio and signal processing SDRangel: GPL: Windows, macOS, Linux: software-defined radio SDR# Freeware Windows software-defined radio receiver SDR++: GPL: Windows, macOS, Linux, Android: software-defined radio receiver WSJT: GPL: Windows, Unix, Unix-like: weak signal communication, modem for FT-8, FT-4, JT-65, and WSPR WSJT-Z ...

4. Automatic direction finder - Wikipedia

   en.wikipedia.org/wiki/Radio_Magnetic_Indicator

   An automatic direction finder (ADF) is a marine or aircraft radio-navigation instrument that automatically and continuously displays the relative bearing from the ship or aircraft to a suitable radio station. [3] [4] ADF receivers are normally tuned to aviation or marine NDBs (Non-Directional Beacon) operating in the LW band between 190 – 535 ...

5. List of software-defined radios - Wikipedia

   en.wikipedia.org/wiki/List_of_software-defined...

   20 MSPS with 12 built-in preselection filters and 3 antenna ports 0.5 1/1 USB 2.0 Yes Yes Yes none SDRplay: RSPduo [100] Pre-built 1 kHz – 2 GHz 10 MHz 14<2 MHz 12<8 MHz 10<9.216 MHz 8>9.216 MHz No Two independent tuners, each with 11 built-in preselection filters. 3 antenna ports 0.5 2/2 USB 2.0 Yes Yes Yes none

6. Direction finding - Wikipedia

   en.wikipedia.org/wiki/Direction_finding

   where SNR 1 and SNR 2 are the video (base-band) signal-to-noise values for the channels for Antenna 1 and Antenna 2, when square-law detection is used. In the case of 3-channel processing, an expression which is applicable when the S:N ratios in all three channels exceeds unity (when ln(1 + 1/SNR) ≈ 1/SNR is true in all three channels), is

7. Tuner (radio) - Wikipedia

   en.wikipedia.org/wiki/Tuner_(radio)

   A television tuner or TV tuner, also called a TV receiver, is a component or subsystem that converts analog television or digital television transmissions into audio and video signals which can be further processed to produce sound and a picture. [29] [30] [31] A TV tuner must filter out unwanted signals and have a high signal-to-noise ratio. [32]