Frequency Lookup for WaveCap-SDR

This skill helps find frequencies and band plans for various radio services.

When to Use This Skill

Use this skill when:

• Finding frequencies for marine/aviation/amateur bands
• Looking up broadcast stations by location
• Verifying frequency allocations
• Discovering what's on a frequency
• Planning SDR monitoring scenarios
• Creating new recipes for specific bands

Common Frequency Bands

VHF Marine (156-162 MHz)

Channel 16 (156.800 MHz) - International Distress/Safety/Calling Channel 9 (156.450 MHz) - Recreational calling (US) Channel 6 (156.300 MHz) - Intership safety

Full band plan: https://www.navcen.uscg.gov/marine-communications-channel-table

Aviation (118-137 MHz)

121.500 MHz - Emergency frequency Typical ranges:

• Tower: 118.0-121.4 MHz
• Ground: 121.6-121.9 MHz
• ATIS: Varies by airport

Find local frequencies: https://www.airnav.com

NOAA Weather Radio (162-163 MHz)

WX1: 162.550 MHz WX2: 162.400 MHz WX3: 162.475 MHz WX4: 162.425 MHz WX5: 162.450 MHz WX6: 162.500 MHz WX7: 162.525 MHz

Coverage map: https://www.weather.gov/nwr/

FM Broadcast (88-108 MHz)

US band: 88.1-107.9 MHz (odd tenths only) Europe/Asia: 87.5-108.0 MHz

Find local stations:

• https://radio-locator.com
• https://fmscan.org

Amateur Radio (Ham)

2 meters: 144-148 MHz (FM repeaters typically 145-147 MHz) 70 cm: 420-450 MHz HF bands: 3.5, 7, 14, 21, 28 MHz

Repeater directory: https://www.repeaterbook.com

Public Safety / Trunking

VHF: 150-174 MHz UHF: 450-470 MHz, 806-824 MHz

Database: https://www.radioreference.com

Online Resources

RadioReference.com - Comprehensive frequency database

• Trunked systems
• Talkgroup IDs
• Local agencies

SignalWiki - Signal identification

• Decode unknown signals
• Modulation types

WebSDR - Remote SDR receivers

• Listen without hardware
• Check propagation

FlightAware/FlightRadar24 - Aviation tracking

• Find airport frequencies
• Track aircraft

Usage Examples

Find Marine Channels

VHF Marine channels are spaced 25 kHz apart
Channel number = (Frequency - 156.000) / 0.025
Channel 16 = 156.800 MHz
Channel 9 = 156.450 MHz

Find Local FM Stations

Visit https://radio-locator.com and enter your ZIP code

Find NOAA Weather

Find nearest transmitter at https://www.weather.gov/nwr/

Find Aviation Frequencies

Visit https://www.airnav.com and search for airport code (e.g., KSEA)

Integration with WaveCap-SDR

After finding frequencies, create a recipe:

yaml
1recipes:
2  my_frequencies:
3    name: "My Frequencies"
4    capture:
5      center_hz: 156800000  # Center on Ch 16
6      sample_rate: 250000
7      gain_db: 35
8    channels:
9      - {name: "Ch 16", offset_hz: 0, mode: "fm"}
10      - {name: "Ch 9", offset_hz: -350000, mode: "fm"}

Or use presets for quick tuning.

Band Plan Quick Reference

Files in This Skill

• SKILL.md: This file - frequency reference and lookup guide

Notes

• Frequencies vary by country (this guide is US-centric)
• Always check local regulations before transmitting
• Some frequencies require licenses (ham, marine, aviation)
• SDR receiving is legal, transmitting requires proper licensing
• Band plans change - verify with official sources
• Use RadioReference.com for most comprehensive database