@mytec Phase 1 - Core UI & Manual Input, Phase 2 - RF Calculation Engine, Phase 3 - Heatmap Visualization

frontend/src/constants/frequencies.ts

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+import type { FrequencyBand } from '@/types/index.ts';
+
+export const COMMON_FREQUENCIES: FrequencyBand[] = [
+  {
+    value: 800,
+    name: 'Band 20',
+    range: '791-862 MHz',
+    type: 'LTE',
+    characteristics: {
+      range: 'long',
+      penetration: 'excellent',
+      typical: 'Rural coverage, deep building penetration',
+    },
+  },
+  {
+    value: 1800,
+    name: 'Band 3',
+    range: '1710-1880 MHz',
+    type: 'LTE',
+    characteristics: {
+      range: 'medium',
+      penetration: 'good',
+      typical: 'Urban/suburban, most common in Ukraine',
+    },
+  },
+  {
+    value: 1900,
+    name: 'Band 2',
+    range: '1850-1990 MHz',
+    type: 'LTE',
+    characteristics: {
+      range: 'medium',
+      penetration: 'good',
+      typical: 'North America, some military equipment',
+    },
+  },
+  {
+    value: 2600,
+    name: 'Band 7',
+    range: '2500-2690 MHz',
+    type: 'LTE',
+    characteristics: {
+      range: 'short',
+      penetration: 'fair',
+      typical: 'High capacity urban, shorter range',
+    },
+  },
+  {
+    value: 150,
+    name: 'VHF High',
+    range: '136-174 MHz',
+    type: 'VHF',
+    characteristics: {
+      range: 'long',
+      penetration: 'excellent',
+      typical: 'Tactical radio, emergency services',
+    },
+  },
+  {
+    value: 450,
+    name: 'UHF',
+    range: '400-470 MHz',
+    type: 'UHF',
+    characteristics: {
+      range: 'medium',
+      penetration: 'good',
+      typical: 'Military tactical radio, PMR446',
+    },
+  },
+  {
+    value: 3500,
+    name: 'Band 42/43 (n78)',
+    range: '3400-3800 MHz',
+    type: '5G',
+    characteristics: {
+      range: 'short',
+      penetration: 'poor',
+      typical: '5G NR, high bandwidth',
+    },
+  },
+];
+
+export const QUICK_FREQUENCIES = [800, 1800, 1900, 2600];
+
+export function getFrequencyInfo(frequency: number): FrequencyBand | null {
+  return (
+    COMMON_FREQUENCIES.find((band) => Math.abs(band.value - frequency) < 50) ||
+    null
+  );
+}
+
+export function getWavelength(frequencyMHz: number): string {
+  const wavelengthMeters = 300 / frequencyMHz;
+  if (wavelengthMeters >= 1) {
+    return `${wavelengthMeters.toFixed(2)} m`;
+  }
+  return `${(wavelengthMeters * 100).toFixed(1)} cm`;
+}