import { useState } from 'react'; import { Button } from "/components/ui/button"; import { Card, CardContent, CardHeader, CardTitle } from "/components/ui/card"; import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "/components/ui/select"; import { Radio, Wifi, Cloud, Mountain, MapPin, Clock } from "lucide-react"; // Define types for our data structures type TimeOfDay = 'dawn' | 'day' | 'dusk' | 'night'; type Season = 'spring' | 'summer' | 'autumn' | 'winter'; type Weather = 'clear' | 'partly-cloudy' | 'cloudy' | 'rain' | 'storm'; type Terrain = 'flat' | 'hilly' | 'mountainous' | 'urban' | 'coastal'; type Range = 'short' | 'medium' | 'long'; interface FrequencyRecommendation { bands: string[]; dayTime: string; nightTime: string; } interface AntennaRecommendation { type: string; description: string; } interface WeatherImpact { impact: string; recommendation: string; } export default function HFFrequencySelector() { // State for form inputs const [timeOfDay, setTimeOfDay] = useState('day'); const [season, setSeason] = useState('summer'); const [weather, setWeather] = useState('clear'); const [terrain, setTerrain] = useState('flat'); const [range, setRange] = useState('medium'); // State for results const [results, setResults] = useState<{ frequencies: FrequencyRecommendation; antenna: AntennaRecommendation; weatherImpact: WeatherImpact; } | null>(null); // State for UI const [isCalculating, setIsCalculating] = useState(false); // Calculate frequency recommendations based on inputs const calculateFrequencies = (): FrequencyRecommendation => { // Base bands based on range let bands: string[] = []; if (range === 'short') { bands = ['80m', '40m', '20m']; } else if (range === 'medium') { bands = ['40m', '30m', '20m', '17m']; } else { bands = ['80m', '40m', '30m', '20m', '17m', '15m', '12m', '10m']; } // Adjust for time of day let dayTime = ''; let nightTime = ''; if (timeOfDay === 'day' || timeOfDay === 'dusk') { dayTime = 'Higher frequencies (20m, 17m, 15m) work best during daylight hours'; nightTime = 'Lower frequencies (80m, 40m) are better for nighttime propagation'; } else { dayTime = 'Lower frequencies (80m, 40m) are optimal during daylight'; nightTime = 'Higher frequencies (20m, 17m, 15m) work well at night'; } // Adjust for season if (season === 'winter') { bands = bands.filter(band => band !== '10m'); // 10m often poor in winter } return { bands, dayTime, nightTime }; }; // Get antenna recommendations based on terrain const getAntennaRecommendation = (): AntennaRecommendation => { switch (terrain) { case 'flat': return { type: 'Dipole or Vertical Antenna', description: 'A simple dipole or vertical antenna works well in flat terrain with good ground conductivity.' }; case 'hilly': return { type: 'Sloper or Inverted V Antenna', description: 'A sloper or inverted V antenna can take advantage of elevation changes for better radiation patterns.' }; case 'mountainous': return { type: 'Portable Beam or Vertical', description: 'A portable beam antenna can be aimed for specific directions. Vertical antennas work well with good radial systems.' }; case 'urban': return { type: 'Vertical Antenna with Radials', description: 'A vertical antenna with a good radial system can overcome nearby structures. Consider stealth antennas.' }; case 'coastal': return { type: 'Vertical or Beverage Antenna', description: 'Vertical antennas benefit from saltwater ground conductivity. Beverage antennas work well for DX.' }; default: return { type: 'General Purpose Antenna', description: 'A standard dipole or vertical antenna should work adequately.' }; } }; // Get weather impact information const getWeatherImpact = (): WeatherImpact => { switch (weather) { case 'clear': return { impact: 'Optimal conditions for HF propagation', recommendation: 'All bands should perform well. Take advantage of current conditions.' }; case 'partly-cloudy': return { impact: 'Minimal impact on HF propagation', recommendation: 'Normal operations possible. Some static may occur during cloud cover.' }; case 'cloudy': return { impact: 'Slight degradation in signal quality', recommendation: 'Expect minor signal fading. Use more robust modes like CW or digital.' }; case 'rain': return { impact: 'Static and signal attenuation possible', recommendation: 'Lower frequencies (80m, 40m) may be more affected. Higher bands might perform better.' }; case 'storm': return { impact: 'Severe static and interference', recommendation: 'Avoid using HF during active storms. Wait for conditions to improve.' }; default: return { impact: 'Normal conditions', recommendation: 'Standard operating procedures apply.' }; } }; // Handle form submission const handleCalculate = () => { setIsCalculating(true); // Simulate processing time setTimeout(() => { const frequencies = calculateFrequencies(); const antenna = getAntennaRecommendation(); const weatherImpact = getWeatherImpact(); setResults({ frequencies, antenna, weatherImpact }); setIsCalculating(false); }, 800); }; return (

HF Radio Frequency Selector

Optimize your HF communications based on conditions

Time of Day

Season

Weather Conditions

Terrain Type

Communication Range

{results && (

Your HF Recommendations

Recommended Frequency Bands

{results.frequencies.bands.map((band) => ( {band} ))}

Daytime: {results.frequencies.dayTime}

Nighttime: {results.frequencies.nightTime}

Antenna Recommendation

{results.antenna.type}

{results.antenna.description}

Weather Impact

{results.weatherImpact.impact}

{results.weatherImpact.recommendation}

)}

Note: Recommendations are based on general HF propagation principles. Actual conditions may vary.

); }