two tone oscillator

Amateur Vertical Antenna Calculator  ^{updated  pop} - This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen.

NCDXF/IARU International Beacon Network - The NCDXF, in cooperation with the IARU, constructed and operates a worldwide network of high-frequency radio beacons.

ITU official web site - The ITU, headquartered in Geneva, Switzerland is an international organization within which governments and the private sector coordinate global telecom networks and services.

NOARS Hamfests - N.O.A.R.S. sponsors two Hamfests each year in Ohio

Optoelectronics - DTMF, RF, decoders receivers and accessories icluding computer interface boards, frequency counters, tone decoders, spectrum sweeper and nearfield receivers

Dunestar Systems - 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.

SDR-Kits.net - USB-Controlled Synthesizer for Softrock RXTX and Local Oscillator Applications

AEA - AEA Technology Inc. is a pioneer and leading manufacturer of RF and cable test equipment for the wireless, Telco, CATV, NMR & MRI, RFID, telemetry, aviation, commercial, military, and two-way radio industries. Produces SWR Meters, Pre Amplifiers, filters, power meters and antenna testing products

Icom UK - Professional Two Way Radio communication by ICOM.

Distance and Bearing Finder - This service uses data from the US Census and a supplementary list of cities around the world to find the latitude and longitude of two places, and then calculates the distance between them. It also provides a map showing the two places, using the Xerox PARC Map Server.

OH3TR ATV Pages - OH3RTR ATV Repeater, and some local ATV inventions like a two-stage 23 cm preamp.

200 Morse Code QSO`s by Les Johnstone, GM¤SOZ - These are 200 Morse Code QSO`s which might typically be heard on the HF bands.

A Code Oscillator Set - How to build a code-practice apparatus to learn morse code

Amateur Packet Radio Networking - Packet Radio Networking Information by CQ Magazine Packet Editor Buck Rogers, K4ABT

Packet radio networking - Packet Radio networking home page with lots of informations and tech. resources

The UK DX Cluster index - Info on the UK Cluster network

ATHNET packet group - ATHNET - Athens, Greece Packet Radio Internetworking Group

Celes Trak - NORAD Two-Line Element Sets, FAQ, and related informations.

NCDXF/IARU International Beacon Network - The NCDXF, in cooperation with the IARU, maintains a network of beacon stations which operate sequentially on five bands.

The Raymond Sarrio Company - Over 3500 radio and test equipment manuals, plus an batteries for two-way radios, laptops, and camcorders.

Carrier Communications - Carrier Communications sells new and used Motorola and GE two-way radios and microwave equipment We also rent space in 22 antenna sites located throughout California to commerical and amateur radio users.

World Radio Network - World Radio Network - (International).

MEI Software - The file MEI-10.ZIP contains educational software to evaluate antenna arrays of up to 8 elements. Two types of arrays may be studied: 2D planar arrays (Yagi-Uda, Circular, etc., up to 6 elements) and colinear arrays (up to 8 elements.)

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.

K1TTT Technical Reference Priority listing - Technical reference about Accessories, Amplifiers, Antennas, Cable and Connectors, Filters, Geography, Grounding, Gunk, Matching Networks, Projects, Propagation Info Radios, RFI/EMI, Rotors, Station Setup, Towers.