🌎 UTC --:--:-- ☀️ SFI -- 📈 K -- 🌞 Sunspots -- 📡 Best Band -- 🎯 DX -- 🔎 Lookups -- 🚀 Station Builds -- 📻 NP4H Mission Control ACTIVE 73 and good DX
UTC --:--:-- Band: 20m Solar: Good DX: Good GO FOR DX
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

--:--UTC Time
--:--Local Time
FCCOpen Lookup 73Daily Mission

🌎 NP4H Mission Control

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.

DX / Advanced Tools

🌗 Grayline Map

Simple day/night propagation reference.

Refresh Map
Grayline ready. Click Refresh Map.

🌎 Can I Work This DX?

Analyze Path
Enter both grids.

📍 Lat/Lon to Maidenhead Grid

Convert
Enter latitude and longitude.

📻 Repeater Finder

Open trusted repeater directories for nearby repeaters.

Search RepeaterBook Open Directory
Use this for VHF/UHF local repeater lookup.

🪪 Callsign Badge Generator

Generate Badge Download PNG

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.

My Station / Operating Center

👤 My Station Profile

Save Profile Load Profile
Save your station profile in this browser.

🎙️ Net Control Script

Generate Script
Generate a clean net control opening script.

🚨 Emergency Quick Card

Generate Card
Generate emergency radio wording.

Local Logbook

Save QSOs in this browser

Add QSO Clear Log

Live Propagation Dashboard

☀️ Band Recommendation Engine

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🌎 DX Opportunity Score

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📡 Current Operating Recommendation

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Antenna Builder Wizard

🧠 Smart Antenna Recommendation

Choose your band, available space and installation type. NP4H will suggest a practical antenna.

Recommend Antenna
Select options to get a recommendation.

Build My Station Wizard

🚀 Smart Ham Station Designer

Answer a few questions and NP4H will design a practical station setup.

Design My Station Download Plan
Select options to generate a station plan.

Ask NP4H

🤖 Ham Radio Assistant

Ask a practical ham radio question. NP4H will give a quick operating recommendation.

Ask NP4H Clear
Ask something about antennas, bands, DX, FT8, POTA, repeaters or station setup.

Mission Control

🕒 UTC Time

--:--:--

☀️ Solar Score

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📡 Best Band

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🌎 DX Score

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World Openings

Today's DX Opportunities

NP4H Pro Suite

🌞 Real Solar Dashboard

Live solar data source when available.

Refresh Solar
Click refresh to load live solar data.

🎯 DX Target of the Day

Daily DX challenge based on UTC date.

Click to reveal today's DX target.

🏆 DXCC Tracker

Track worked DXCC entities locally in this browser.

Add worked DXCC entities.

📻 My Station Score

Score My Station
Select your station details.

📡 Who's On The Air

Local browser board. Great for a future community feature.

Post Status Clear Board
No active operators posted yet.

📡 Repeaters

RepeaterBook

Worldwide repeater directory.

Open →

🌎 DX Prefix Lookup

Mission Control Prefix Search

Enter a DX prefix to identify the country.

🛰️ Satellites

AMSAT

Amateur Radio Satellites.

Open →

SatNOGS

Satellite tracking network.

Open →

📡 Operator Signal Center

Generate On-Air Message

Create clean radio-ready wording for CQ, DX, POTA, signal reports and QSO replies.

Select message type and enter your details.