- Manufacturer of single band and multiband transceiver bandpass filters for HF. High pass filters, two radoi headphones mix and switch, 6 meter portable antenna, antenna remote switching and steering.
USNO Mater Clock Time
- Time reference from USNO, USNO Time in Standard Time Zones,USNO Master Clock Time Animated GIF Clocks, Analog Java Clock, Compute Local Apparent Sidereal Time, Check your local System Clock vs. our Master Clock!
Digital Communications Conference
- Hams convene each year at a Digital Communications Conference to evaluate and further the state of the art. TAPR's webserver provides conference papers from previous DCCs as well as information about the upcoming DCC.
Near-Realtime MUF indicatorpop
- This is a highly informative map that can be used by amateur and professional radio communicators to determine maximum usable frequencies for any world-wide path at the indicated UTC (Zulu) time.
- Spread Spectrum Scene. Radio Propagation notes, with downloadable files.
Popagation studies committeePriority listing
- This page is about the RSGB's Propagation Studies Committee, its work, services and current projects, together with guides to where to find more about matters relating to propagation on the Internet at all levels from introductory to professional. Watch this space!
Windows Telnet to ComPort cross connect
- This program lets you cross connect Telnet connections and ComPorts or Ethernet. It can be used as a backup connection for PacketCluster nodes or to connect a CT network to a remote PacketCluster.