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2. WSPR (amateur radio software) - Wikipedia

   en.wikipedia.org/wiki/WSPR_(amateur_radio_software)

   It is a protocol, implemented in a computer program, used for weak-signal radio communication between amateur radio operators. The protocol was designed, and a program written initially, by Joe Taylor, K1JT. The software code is now open source and is developed by a small team.

3. Noise reduction - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction

   Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode rejection ratio.

4. Yaesu FT-891 - Wikipedia

   en.wikipedia.org/wiki/Yaesu_FT-891

   A Yaesu FT-891 Radio Tuned to the 10 Meter Band. The Yaesu FT-891 is a HF and 6 meters all mode mobile amateur radio transceiver. The FT-891 was first announced to the public by Yaesu at the 2016 Dayton Hamvention. [1] The radio has 100 watts output on CW, SSB, and FM modulations and 25 watts of output in AM. [2]

5. WSJT (amateur radio software) - Wikipedia

   en.wikipedia.org/wiki/WSJT_(amateur_radio_software)

   FSK441, introduced in 2001 as the first communications mode included with WSJT, [3] is designed to support meteor scatter communication using radio-reflecting meteor trails. [2] The bursts of signal created by such trails are commonly referred to as "pings", due to their characteristic sound.

6. Dynamic range compression - Wikipedia

   en.wikipedia.org/wiki/Dynamic_range_compression

   A compressor increases the average level of the modulation signal thus increasing the transmitted signal strength. Most modern amateur radio SSB transceivers have speech compressors built-in. Compression is also used in land mobile radio, especially in transmitted audio of professional walkie-talkies and remote control dispatch consoles. [15]

7. Companding - Wikipedia

   en.wikipedia.org/wiki/Companding

   Professional wireless microphones do this since the dynamic range of the microphone audio signal itself is larger than the dynamic range provided by radio transmission. Companding also reduces the noise and crosstalk levels at the receiver. [3] Companders are used in concert audio systems and in some noise reduction schemes.

8. Emphasis (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Emphasis_(telecommunications)

   Pre-emphasis is commonly used in telecommunications, digital audio recording, record cutting, in FM broadcasting transmissions, and in displaying the spectrograms of speech signals. One example of this is the RIAA equalization curve on 33 rpm and 45 rpm vinyl records. Another is the Dolby noise-reduction system as used with magnetic tape.

9. List of amateur radio transceivers - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio...

   [24] [25] [26] Introduced in the year 2000, the radio was known for its "all-in-one" functionality. It can transmit on all amateur radio bands between 160 meters and 70 centimeters, with the exception of the 1.25 meters band, and the "X" model also has built-in 23 centimeters band capability option. Kenwood discontinued production of the TS ...