intercom systems

Short Vertical Antennas and Ground Systems  ^pop - This article describes how an effective ground system can be produced for a short vertical antenna.

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.

Q-PAR Microwave Antennas - The company (founded in 1973) excels in the research, design, development and manufacture of microwave antenna systems & components. Our range includes horn, reflector, sinuous, spiral, LPDA, helical antennas, etc; antenna positioners, and many bespoke components.

Max-Gain Systems, Inc. - Fiberglass for the antenna builder, Antenna Mart quads, Bandmaster quads, transmitting components, vacuum capacitors and relays, tower accessories, gin poles, remote RF coax switches, rotating side mounts, quad spreaders, quad parts, bristol wrenches, doorknob capacitors, transmitting electron tubes, and much more!

Times Microwave Systems - Manufacture LMR Flexible low loss coax cable, connectors, and cable assemblies for Wireless Communications applications.

Andrew Corporation - Communications products, communication systems products, fiber optic cables, global messaging service, gyroscope and navigation systems

Link Communications - Repeater and linking control systems

FF Systems - manufactures and sells repeater controller products and accessories

Heights Tower Systems  ^pop - Telescopic towers, platforms and accessories

Ritron - Vhf Ufh transceivers, repeaters, Telemetry Scada Systems and accessories

NovaLynx Corporation - "Instruments & Systems for Weather & Water Monitoring; weather stations, wind alarms, sensors for wind speed, wind direction, precipitation, temperature, relative humidity, barometric pressure, solar radiation, evaporation, rain & snow gauges, lightning detection."

Antenna Systems & Supplies - Antennas, cables, Grounding Equipment, shelters and towers.

Elmer - Macintosh shareware, contains the full pool of questions for each of the five exams, and creates sample tests that will vary each time you take them and it will grade your exam.

MacProp - Propagation forecasting software for the Macintosh

MacIcomControl - Radio control software for the Macintosh

Mac GrayLiner - Displays map of the world, showing day and night areas.

Promethius - Logbook software for the Macintosh by Chris Smolinski

Morse Mania - A morse code tutor for the Macintosh.

Macintosh SSTV Shareware - SSTV software is now available for the Macintosh computers, for the first time.

Audiocoreder - Audiocorder is a VOX program which allows your Macintosh to act as an audio recorder

MultiMode - Digital modes decoding software for the macintosh. Decodes CW, RTTY, WEFAX, SATFAX, ACARS, DTMF, SSTV

Intercom - DOS freeware decoding program for Morse, RTTY, ASCII, BPSK31, TOR-FEC FELDHELL and receive TOR-ARQ.

Ipmulse Systems - Impulse Systems offers several innovating products: F6FBB Language Editor and WinPack CoDec

AREPS propagation programs - Collection of various propagation software by Space and Naval Warfare Systems Center, San Diego, Atmospheric Propagation Branch

FTV  ^pop - FTV is an MS-DOS program used to receive images from Weather Satellites and Terrestrial Facsimile Stations, text transmissions from radio telex services, Morse code, as well as Amateur Radio FAX, SSTV, RTTY and CW signals. It can also be used to transmit FAX and SSTV. No external hardware, other than a radio, is required, as all the necessary signal processing is implemented in software.