17 lines
860 B
TypeScript
17 lines
860 B
TypeScript
// sMeterRST turns an S-meter reading into the RST report you SEND to the other
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// station (RST tx / rst_sent) — because your S-meter is how strong THEY are.
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//
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// s : S-unit 0-9 (used when below S9)
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// overDb : dB over S9 (0 when at/below S9)
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// mode : operating mode — CW/digital get a 3-digit RST, phone a 2-digit RS
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//
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// For S9+ the dB is rounded UP to the nearest 5 (a 9+3 reading reports 59+5,
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// 9+12 reports 59+15, …), matching how operators give strong-signal reports.
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export function sMeterRST(s: number, overDb: number, mode?: string): string {
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const cw = /CW|RTTY|PSK|FT[0-9]|JT|JS8|MFSK|OLIVIA|DATA|DIG/i.test(mode || '');
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const strength = Math.max(1, Math.min(9, Math.round(s)));
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if (cw) return overDb > 0 ? '599' : `5${strength}9`;
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if (overDb > 0) return `59+${Math.ceil(overDb / 5) * 5}`;
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return `5${strength}`;
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}
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