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Antennas : Feed Lines
SWR: Maximum allowable VSWR
- VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
Antennas for 136kHz
- A very long and exaustive documentation on building antennas for 136 khz. Includes links to antenna design software for longwave
Home Brew VHF UHF dual band antenna
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- Contructing precedure and tune up of a dual band mobile antenna. This antenna is just a 1/4 wavelength resonator for both UHF and VHF band. It provides no GAIN as compared to other multi-section design.
Tom's Antique Radio Repair
- Specializing in antique, vintage and tube radio repair, all makes. Transistor radio repair- from the 50's to the present. Free estimates.
DXCC map
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- Large JPG dxcc map with ham prefixes and CQ zones
The Personal Radio Association
- The Personal Radio Association represents persons and licensees in GMRS/FRS/MURS/CB/Part 15 before the FCC, FTC, industry, and the public. Join us to protect and preserve the Personal Radio Services.
The Society for the Preservation of Amateur Radio
- The Society for the Preservation of Amateur Radio is a non-partisan group of concerned amateur radio operators working together to ensure the vitality of the Amateur Radio Service by promoting technical abilities among Amateur Radio Operators. Includs a beginners guide booklet.
IW3SIM Rosario
- Italian prefix maps and band plans, includes links to antenna plans and many ham radio resources.
K6RF Streaming Video
- Live video and audio feed from K6RF ex K6DXC radio shack. Audio is from either the FT-920, FT-817 receivers or a microphone. Video is from a Logitech Pro-4000 Webcam
CAP Wireless Amplifiers
- Design and manufacture application specific microwave and RF amplifiers, upconverters, downconverters and multifunction assemblies.
US Frequency allocations
- Searchable database of frequency allocations in the US, from cellular frequencies, paging frequencies to marittime and microwave frequencies.
KØBG's ham radio mobile operator web site
- This site is dedicated to mobile amateur radio operators, old and new alike. Whether you are into HF, or VHF operation, I trust the information presented will increase your enjoyment of our great hobby.
With safety as a byword, there are articles on amplifiers, antennas, bonding, impedance matching, installing hardware, mobile equipment, noise and RFI abatement, wiring, and much more. I do my best to keep these articles up to date, and easy to follow.
ESA Portal - Calling all radio amateurs
Priority listing
- Radio amateurs worldwide are being asked to help collect data from the student-built SSETI Express satellite, due to be placed in orbit on 27 September. To encourage them, ESA’s Education department has organised two competitions and is supplying free downloadable software.
Yaesu VX-7R review
- N0UQZ Yaesu VX-7R review
Yaesu radios - defcon forums VX-7R comments
- yaesu radios community talk, impressions and comments about yaesu vx7r
Rocket Radio UK
- UK based suppliers of CB, amateur radio equipment and DAB digital radios. Other products include antennas, base and handheld scanners, and accessories including microphones, books.
TLE for windows
- Transmission Line equations for Windows. Written in Visual C++. This program provides the most comprehensive analysis of a transmission line by w9dmk
WEaudio recorder
- WEaudio was born as a program to record activity on VLF band, it can records audio file on HD as long as you want within prefixed pauses. It can starts record at the hour you want to monitor.
MorseGen v1.2
- MorseGen converts text into a WAVE file of Morse code. The Tone and Speed are adjustable and the WAVE file can be repeated at a pre-set interval allowing it to be used as a CW Ident for amateur radio applications which require it.
Morse Maker
- MorseMaker is an up-to-date replacement for the Morse Machine shown further down this page. It has been re-written using a different programming language and is now entirely 'stand-alone' requiring no run-time support files. This version also works with Windows XP and can use the soundcard but please note that, unlike its predecessor, it does not split the alphabet into smaller 'learning' blocks and does not incorporate the Morse reader.
Shortwave Log (SWLog)
- Shortwave Log, SWLog is a comprehensive logging and radio control program. While designed for shortwave and mediumwave listening, the program is quite adept when listening to longwave, utility, or amateur radio. Support Icom Drake TenTec Yaesu JRC and lowe receivers.
Assessing unknown Ferrite Toroids
- Ok so you have had a good day at the Rally and you have come back with a carrier bag full of ferrite toroids that "just might be useful for something". How do you find out what they are? Very few seem to be stamped with any indication of their properties, and some are 'painted' garish colours which presumably means something.
Precision Frequency Enthusiasts
- Frequency measurement for beginners, technical terms related to frequency measurement and accuracy, techniques and calibrating procedures.
CB Mic Wiring
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- Excellent resource for microphones wiring including old make of cb radios.
Microphone wiring can be a real pain if you arent sure how to work out which wire goes where. On this page i will try to explain the basics and also give you the wiring positions for most CB radio's
Safety: RF awarness guidelines
- Although Amateur Radio is basically a safe activity, in recent years there has been considerable discussion and concern about
the possible hazards of electromagnetic radiation (EMR), including both RF energy and power frequency (50-60 Hz) electromagnetic fields. This section summarizes what is now known and offers safety precautions based on the research to date.
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