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161 links about cat system on dxzone.com

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Antennas : G5RV
  • G5RV - Radio comm. 1984 - Article taken from Radio Communications July 1984 by Louis Varney G5RV
    [ Hits: 841 | Votes: 1 | Rating: 1.00 ]
Antennas : Theory
  • QEX Ground System Experiments - N6LF series of experiments on ground systems for vertical antennas. That series of reports was converted, with some modifications, into a series fo seven articles in QEX magazine.
    [ Hits: 531 | Votes: 1 | Rating: 8.00 ]
  • Antenna resonance and bandwidth - About antenna or aerial resonance and bandwidth and the impact of RF antenna resonance and bandwidth on radio communications systems.
    [ Hits: 243 | Votes: 0 | Rating: 0.00 ]
Antennas : Vertical Ham Radio : Clubs : North America : USA : California
  • HDSCS Hospital Disaster Support Communications System - A group of ham operators in Orange County, California that has supported over 30 hospitals since 1980. Includes information on how hams can provide hospital support in their own areas.
    [ Hits: 201 | Votes: 0 | Rating: 0.00 ]
Ham Radio : Clubs : North America : USA : Texas
  • The Austin QRP Club - The A QRP Club is a small group of Amateur Radio enthusiasts who enjoy building, operating and (mostly) talking about Low Power radio communications, equipment and systems.
    [ Hits: 308 | Votes: 1 | Rating: 10.00 ]
Internet and Radio : WebSDR
  • WebSDR from Siberia - Softrock 6 20m receiver located in Tyumen Russia
    [ Hits: 1395 | Votes: 7 | Rating: 4.57 ]
Manufacturers : Antenna Masts and Mounts
  • Vortex Antenna Systems - Vortex Antenna Systems, radio communication antenna aanufacturer and supplier of antenna related hardware. Ham radio HF and VHF Antennas, antenna parts, mast and mounts.
    [ Hits: 1930 | Votes: 1 | Rating: 10.00 ]
  • Radio Structures - Manufacturers and Installers of Masts, Towers, Antenna systems, Trailer Masts, Lattice Masts and Bracketry. Radio, CCTV and lighting masts, tower Refurbishments, safety surveys, mast tower inspections, safe to climb certification
    [ Hits: 294 | Votes: 3 | Rating: 10.00 ]
Manufacturers : Antennas : Broadcast
  • TCI International - US global provider of innovative radio frequency (RF) solutions for spectrum monitoring and antenna applications. Specializes in Spectrum Monitoring, Communications Intelligence , HF/MF Broadcasting & Communication antenna systems.
    [ Hits: 260 | Votes: 0 | Rating: 0.00 ]
  • Kathrein Inc - Manufacturer of professional antenna and filter systems for communications and broadcasting, serving commercial and governmental markets worldwide.
    [ Hits: 342 | Votes: 2 | Rating: 5.50 ]
Manufacturers : Antennas : Military
  • STAR-H Corporation - STAR-H Corporation specializes in extremely wideband dipoles and compact low-profile antenna systems for military, emergency management, commercial operations and consumer wireless applications.
    [ Hits: 214 | Votes: 2 | Rating: 10.00 ]
Manufacturers : Broadcasting Equipment
  • Amplifier Systems, Inc - Designer and manufacturer of RF amplifiers used in a variety of custom applications in many diverse industries - from Scientific, Medical, Industrial, and Communications and Broadcast.
    [ Hits: 148 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Transceivers
  • XCOM Avionics - Communications systems for sport aircraft
    [ Hits: 133 | Votes: 0 | Rating: 0.00 ]
Operating Aids : Phonetics and codes
  • RSQ Signal Rporting for Digital Modes - This site is devoted to promoting RSQ as an improved signal reporting system for narrow band digital modes and to demonstrating its application to the popular PSK31 mode.
    [ Hits: 409 | Votes: 1 | Rating: 5.00 ]
Operating Modes : Repeaters : USA
  • k7ICU Tucson AZ Repeater - The K7ICU repeater system is situated about 500' above metro Tucson, at the base of the Catalina Mountains. It is an open system providing coverage to the greater Tucson area.
    [ Hits: 178 | Votes: 0 | Rating: 0.00 ]
Radio Equipment : HF Transceivers : Yaesu FT-857 Shopping and Services : Regional : USA
  • Rad-Comm Systems - Emergency Communication Equipment. Rad-Comm Systems is a veteran owned business and knows how critical your communication needs can be.
    [ Hits: 92 | Votes: 0 | Rating: 0.00 ]
Software : Android
  • HamSatDroid - This software predicts future passes for amateur radio satellites for a specified location and period of time. It runs on the Android operating system
    [ Hits: 2175 | Votes: 1 | Rating: 7.00 ]
Software : Satellite tracking
  • phpPredict - Implementation of NORAD SGP4/SDP4 algorithms in PHP for determining a satellites location and velocity in Earth orbit. These SGP4/SDP4 models were ported from Predict 2.2.3 written by John A. Magliacane (KD2BD) for the Linux operating system.
    [ Hits: 320 | Votes: 5 | Rating: 10.00 ]
Software : Voice Keyer
  • Sound Byte - Sound Byte is a voice keyer for contests as well as general ham radio use. Windows and Mac, commercial by Black Cat Systems
    [ Hits: 563 | Votes: 2 | Rating: 5.50 ]
Software : iPhone
  • Friis-It NF for iPhone - Friis-It NF is the first iPhone OS based application that allows you to calculate noise figure, system sensitivity, and cascaded gain for an RF Receiver system
    [ Hits: 360 | Votes: 1 | Rating: 10.00 ]
  • iPad iPhone HF Weather Fax Decoder App - HF Weather Fax lets you receive marine weather radiofascimile transmissions on your iPad, iPhone and iPod Touch. Just connect it to a shortwave radio tune in a weather fax frequency, and watch the images come in.
    [ Hits: 887 | Votes: 1 | Rating: 1.00 ]
Technical Reference : Radio Frequency Interference : Noise Reduction
  • Ferrite in EMC applications - Electro-magnetic compatibility EMC issues arise when electronic systems interact in an un-desired way
    [ Hits: 235 | Votes: 1 | Rating: 9.00 ]
Technical Reference : Radio Mods
  • TenTec Omni VI AGC modification - Modification leaves nearly all of the existing Omni agc circuitry intact, simply add an audio detector which modifies the delay characteristics of the original system by G3IXQ
    [ Hits: 350 | Votes: 0 | Rating: 0.00 ]
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