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JT9, intended for MF and HF use, was introduced in WSJT-X, which was at the time an experimental version of WSJT. [10] It uses the same logical encoding as JT65, but modulates to a 9-FSK signal. With 1-minute transmission intervals, JT9 occupies less than 16 Hz bandwidth.
The Inter-Range Instrumentation Group (IRIG) is the standards body of the Range Commanders Council (RCC). The group publishes standards through the RCC Secretariat at White Sands Missile Range.
Raspberry Pi as WSPR transmitter. The protocol was designed to test propagation paths on the LF, MF and HF bands. Also used experimentally at VHF and higher frequencies.. Other applications include antenna testing, frequency stability and frequency accuracy checking.
7.0–7.3 MHz/10.10–10.15 MHz, and 14.00–14.35 MHz ext No External ADC required (I/Q output) 1/1 Crystal controlled two channels Yes Yes Yes Cyan [33] Pre-built 100 kHz – 18 GHz 1 – 3 GHz (8 fully independent Rx chains and 8 fully independent Tx chains, each capable of up to 1 GHz of RF bandwidth) 16 16 Yes 1–3 GSPS ADCs
Shortwave bands are frequency allocations for use within the shortwave radio spectrum (the upper medium frequency [MF] band and all of the high frequency [HF] band). Radio waves in these frequency ranges can be used for very long distance (transcontinental) communication because they can reflect off layers of charged particles in the ionosphere and return to Earth beyond the horizon, a ...
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While technically minded shortwave listening hobbyists dwindled during the war years due in part to the demands of military service, casual listeners seeking war news from foreign broadcasters increased. Shortwave receiver manufacturers contributed to war production. Zenith launched the multi-band Trans-Oceanic series of radios in 1942. In some ...