AMATEUR RADIO REFERENCE CENTER

Tools for operators, DXers and experimenters.

Callsign lookup, RF calculators, grid distance, local logbook, band plans, Q-codes, Morse practice and useful radio references in one clean dashboard.

Search License Open Calculators

Live Console

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--:--Local Time
FCCLookup Ready
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Solar Conditions / Band Advisor

☀️ Live Solar Conditions

Loads public solar condition data when available.

Refresh Solar Data
Click refresh to load solar data.

📡 Band Advisor

Select time and goal.

FCC / Callsign Lookup

🔎 Live Callsign Lookup

Search US amateur radio license data by callsign.

Search License
Enter a callsign to search.

🏛️ Official Search

Use official external searches for advanced FCC, name, city, state or ZIP lookups.

Open FCC ULS Open ARRL Search
Advanced searches open in a new tab.

RF Calculators

Dipole Antenna

Enter frequency.

Quarter Wave Vertical

Enter frequency.

Wavelength

Enter frequency.

Watts to dBm

Enter power.

SWR Reflection

Enter SWR.

Callsign Phonetic

Enter callsign.

Grid / Distance Helper

Maidenhead Grid Distance

Enter both grid squares.

Simple QSO Script

Enter your QSO info.

Operator Tools

📡 Coax Loss Estimator

Enter coax details.

⚡ ERP / EIRP Calculator

Enter power, gain and loss.

📻 Repeater Offset Helper

Enter repeater details.

🎛️ Contest Exchange Builder

Enter contest exchange details.

⏱️ UTC Scheduler

Enter local time and UTC offset.

🔊 Morse Code Practice

Play Morse
Enter text.

🌎 DX Direction Notes

Select region.

💾 Export Logbook

Download your browser logbook as CSV.

Export CSV
Uses the local NP4H logbook saved in this browser.

Visual Band Plan Reference

CW Digital SSB FM

80m — 3.5 to 4.0 MHz

Good for regional/nighttime HF contacts.

40m — 7.0 to 7.3 MHz

Reliable daytime regional and nighttime DX band.

20m — 14.0 to 14.35 MHz

Main DX band during daylight and openings.

10m — 28.0 to 29.7 MHz

Excellent worldwide DX when solar conditions are strong.

Learning Center

🗣️ Phonetic Alphabet

Alpha, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliet, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu.

🧭 Q-Codes

QTH: Location
QSO: Contact
QSL: Confirm reception
QRZ: Who is calling me?
QRM: Interference
QRN: Static noise

📶 Signal Reports

RST: Readability, Strength, Tone.
59: strong and clear voice signal.
599: strong CW/digital report.

📻 Popular Modes

SSB: HF voice
CW: Morse
FT8: weak signal digital
FM: repeaters/local
AM: vintage/experimental

🚨 Emergency Basics

Mayday: life-threatening emergency.
Pan-Pan: urgent situation.
Break: priority interruption.

✅ Before Calling CQ

Listen first. Ask if the frequency is in use. Identify clearly. Keep transmissions respectful and concise.

Local Logbook

Save QSOs in this browser

Add QSO Clear Log