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Antennas : 2M
  • Slim Jim 2m Vertical - This VHF 145 MHz antenna is easy to build and with no radials. It shows equal gain of 5/8 lambda. It is light weight, you can hang it somewhere (on a tree may be) and work.
    [ Hits: 3390 | Votes: 3 | Rating: 6 ]
Antennas : G5RV
  • G5RV Antenna Homebrew - Homebrew G5RV a simple multiband antenna. This article shows detailed pictures of a G5RV home made antenna, including antenna size and dimensions by 9M2ZAK
    [ Hits: 1584 | Votes: 4 | Rating: 7.25 ]
Antennas : Theory
  • Crossed Field Antenna - The Crossed Field Antenna (CFA) is one of the applications of Correction of Maxwell's Equations which was used over 150 years ago which was proved these days that the Magnetic Field Source is only the Displacement Current not the Conduction Current . These Corrections was made by an Egyptian Doctor Engineer Fathi Kabbary , who reached the New Correct Theory which shows that the height and efficiency of the antenna doesn't depend on the wavelength
    [ Hits: 2306 | Votes: 5 | Rating: 2.8 ]
Antennas : Towers
  • W5AJ Tower setup - This page shows W5AJ & KD5AAU setting up a self supporting crank over tower.
    [ Hits: 2261 | Votes: 0 | Rating: 0 ]
DX Resources : Beacons
  • Beacons QSLs - Colelction of QSLs received from listened beacon stations, it shows a few of the QSLs sent out by NDB operator
    [ Hits: 1535 | Votes: 1 | Rating: 8 ]
DX Resources : Callsigns : Vanity Call Signs
  • RadioQTH - Ham radio vanity license search - RadioQTH Amateur Radio Vanity License Search: This site shows vanity call sign requests filed with the FCC, when call signs will be available for vanity applications and other useful tools that will help in the search for the perfect amateur radio vanity call sign.
    [ Hits: 3437 | Votes: 12 | Rating: 6.5 ]
Operating Modes : Repeaters : Repeater maps
  • UK Repeaters for iPhone - UK Repeaters is an iPhone app that shows all UK Based repeaters on a map. Each repeater information is shown to allow easy access and programming of your radio
    [ Hits: 768 | Votes: 3 | Rating: 6.33 ]
Operating Modes : Satellites : Real Time Tracking Operating Modes : VHF UHF
  • EI5FK's VHF Ham Radio Website - "Shows who is ""active"" on VHF in EI, Solar Auroral and Tropo information, Vhf logs and maps."
    [ Hits: 964 | Votes: 2 | Rating: 10 ]
Propagation : MUF Indicators
  • Near-Real-Time F2-Layer Critical Frequency Map - This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.
    [ Hits: 5270 | Votes: 24 | Rating: 4.84 ]
Software : Antenna analysis
  • Tower - Windows program for analyzing vertical antennas. This program shows the resistance and reactance to be expected looking into a cylindrical metallic tower over a perfect ground. It gives a useful approximation of the values to be expected in a real-world situation.
    [ Hits: 1341 | Votes: 1 | Rating: 10 ]
  • TLDetails - Transmission Line Details. This utility program shows the impedance and SWR at both ends of a transmission line and the details of power loss in the line. It includes characteristics for over 40 built-in line types. You can modify these values to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes. If you are using a moderately fast computer you can hold down a spinner and "watch the movie" on the charts as the results are recomputed. By AC6LA
    [ Hits: 1205 | Votes: 4 | Rating: 9.25 ]
Software : Beacon Monitoring
  • BeaconSee - BeaconSee shows you, in real time, worldwide HF band openings on your PC. Analyses the audio signals from your radio, which is tuned to the NCDXF IARU HF beacon network and shows you the signal strength received from each of the 18 beacon transmitters as a plot of frequency spectrum against time.
    [ Hits: 7239 | Votes: 13 | Rating: 7.61 ]
Software : DX Cluster
  • Cluster monitor - Cluster monitor is a tool for web and telnet clusters monitoring. The program shows spot history, the latest spots are shown in a separate window with full information about the DX, announcements, WWV propagation, and full sorting and filtering capability. Full support for AALog and AAVoice by RZ4AG, DXAtlas by VE3NEA. Integrated dial-up support. Price USD 25
    [ Hits: 3724 | Votes: 11 | Rating: 6.9 ]
Software : Linux
  • Smith chart calculator - linSmith is a Smith Charting program, mainly designed for educational use. It allows defining multiple load impedances (different frequencies), and adding components (discrete components and line sections) in series and parallel. It plots the impedances on the screen, shows the values in table format, and is able to generate publication quality Postscript output.
    [ Hits: 4122 | Votes: 28 | Rating: 3.92 ]
Software : Radio Control
  • HugeIcom - This is a very simple program which helps visually handicapped people to see the frequency and mode of the rig. Or maybe it's useful for demos, trade shows or similiar. It will work with any Icom except the IC-735.
    [ Hits: 1172 | Votes: 1 | Rating: 10 ]
Software : Time
  • Sun Clock - shows time zones around the world a well as the time at locations of your choice.
    [ Hits: 3302 | Votes: 9 | Rating: 5 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • Push pull 2m amplifier - This shows an unsuccesful attempt to build a push pull 2 m amplifier, with the tubes in grounded screen.
    [ Hits: 11986 | Votes: 20 | Rating: 5.51 ]
Technical Reference : Antenna Switch
  • A Coax Switch - An inexpensive coax switch. shows a proven inexpensive home-made antenna selection switch. If you question the use of a cheap slide switch and SO239 coax sockets, read on. Measurements in a physics lab showed there to be practically no reflection on HF and even on 70 cm the SWR was below 1.3 : 1
    [ Hits: 9676 | Votes: 8 | Rating: 7.5 ]
Technical Reference : Radio Frequency Interference : Noise Reduction
  • Common-Mode Noise - Receiving Common Mode Noise shows how lack of a balun can contribute to system noise
    [ Hits: 2085 | Votes: 4 | Rating: 8.5 ]

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