Radio

ARRL headquarters office in Newington, Connecticut. General amateur radio information, membership information, news, events schedule, coordinating organizations.

Interactive world atlas, local time, sunrise and sunset times in several hundred cities worldwide.

Detailed airport information, including all airport and navigational aid communications frequencies.

Information regarding amateur radio satellite communications. Also available are Keplerian elements in several formats, updated weekly.

Resource for javAPRS, javAPRSSrvr, and the APRS weather server.

Keplerian elements for most satellites in low-earth orbit. Also includes historical archives dating back to 1980 and information about satellite tracking.

Club resource includes contact information, history, activities and links. [English]

French amateur presents DX information, QSL logs and photos, plus links. [EnglishFrench]

.PDF datasheets for electronic components, including RF modules, transistors, integrated circuits, and amateur equipment.

Offers organizational information, clubstation and licencing information, download area, a callsign search, bandplan details and news. [English, German]

Dedicated to amateur radio DXing.

VHF DX information with AURORA and E-SKIP warnings via your email or mobile phone.

How to use Intel micro-controller, electronic hardware, and software.

Design of transmission and reception block schemes software. Provided with examples of applications.

Provides database search, renewal or modification of FCC license, and callsign updates. Includes club link.