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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.

eQSL
checkt to see if you have
any eQSL cards!
Enter your callsign to see if you have an eQSL waiting!

LotW
Club Log
I upload logs on the
1st and the 15th
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