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The author labled this mode as a 4-FSK modulation so this is why it is under FSK

This mode is intended to use as a network of beacons to report across the internet for real time propagation conditions, it also has the abilitiy to band hop.

Standard message: callsign + 4-digit locator + dBm (e.g., K1ABC FN20 37)

Messages with a compound callsign and/or 6-digit locator use a two-transmission sequence. The first transmission carries compound callsign and power level, or standard callsign, 4-digit locator, and power level; the second transmission carries a hashed callsign, 6-digit locator, and power level. Add-on prefixes can be up to three alphanumeric characters; add-on suffixes can be a single letter or one or two digits.

Standard message components after lossless compression: 28 bits for callsign, 15 for locator, 7 for power level, 50 bits total.

Forward error correction (FEC): non-recursive convolutional code with constraint length K=32, rate r=1/2.

Number of binary channel symbols: nsym = (50+K-1) * 2 = 162.[2]
Keying rate: 12000/8192 = 1.4648 baud.

Modulation: continuous phase 4-FSK, tone separation 1.4648 Hz.

Occupied bandwidth: about 6Hz

Synchronization: 162-bit pseudo-random sync vector.

Data structure: each channel symbol conveys one sync bit (LSB) and one data bit (MSB).
Duration of transmission: 162 * 8192/12000 = 110.6 s.

Transmissions nominally start one second into an even UTC minute: e.g., at hh:00:01, hh:02:01, etc.

Minimum S/N for reception: around -28 dB on the WSJT scale (2500Hz reference bandwidth).

If you ran across this on the radio you might think it is a birdie in your radio due to the small bandwith.

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