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ss meter

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Antennas : 2M
  • Two elements Telescopic Yagi for 2 Meters - A lightweight PVC hand-held telescopic 2 element 2m (145 MHz) yagi using two pairs of TV rabbit ear antennas as the driven and reflector elements. Approximate directional gain is 5dB.
    [ Hits: 161 | Votes: 0 | Rating: 0 ]
Antennas : 30M
  • 30m Half -Size Rotary Dipole - A rotary dipole antenna for 30 meters band. Each arm is about 12.5 ft and is constructed from telescoping fibreglass flag/fishing poles and short lengths of aluminium tubing. Two short lengths of glass-fibre rod were used to insulate the arms from the supporting hardware.
    [ Hits: 197 | Votes: 0 | Rating: 0 ]
Antennas : 4M
  • 70Mhz (4 metre) Delta Loop Antenna - Discover the success story of creating a 4-meter Delta Loop antenna, ideal for improving radio communication. This horizontally polarized antenna offers efficient performance when mounted at VHF heights, catering to both HF and VHF characteristics. A simple, DIY project suitable for portable setups, providing versatile options for radio enthusiasts.
    [ Hits: 53 | Votes: 1 | Rating: 4 ]
Antennas : 6M
  • 6m Oblong Loop Antenna - Homebrew 6 meters antenna for SOTA and Parks activations.
    [ Hits: 81 | Votes: 0 | Rating: 0 ]
  • Enhancing Performance with a Cage Dipole for Six Meter Band - Explore the design and testing of a cage dipole antenna for 6 meters. Through innovative construction, witness a remarkable 77% increase in bandwidth and improved impedance characteristics.
    [ Hits: 75 | Votes: 0 | Rating: 0 ]
Antennas : Dipole
  • Make your own 40/80 Dipole - Make your own dipole for 40 and 80 meters band, assembling standard product parts like 40 meter traps, the 1:1 balun and insulators
    [ Hits: 123 | Votes: 0 | Rating: 0 ]
Antennas : End-Fed
  • 8010 Enfed Antenna - With this antenna the coverage is 80,40,20,15 and 10 meter band without any antenna tuner and the average SWR is below 1.2 on phone bands. The total antenna lenght is about 23 meters , with one 20.4 meters long segment from the 1:49 transformer to the 110uh coil and about 2.2 meters long segment from the coil to the insulator.
    [ Hits: 137 | Votes: 0 | Rating: 0 ]
Antennas : Vertical
  • 20-30m Vertical Antenna - Homebrew project for a vertical antenna with a coaxial-cable trap, that works on 20 and 30 meters band.
    [ Hits: 73 | Votes: 0 | Rating: 0 ]
  • Modified Ground Plane Antenna Adds Second Band - This article explains the trick of how to shorten and lengthen pairs of radials to make a 2-band ground plane antenna. Included is a "Table of Multi-Band Possibilities" covering the range of 6 to 40 meters.
    [ Hits: 53 | Votes: 0 | Rating: 0 ]
Antennas : Wire
  • The Squid Pole Wire Antenna Re-visited - The author explores enhancing the performance of a 7-meter fiberglass squid pole wire antenna for amateur radio. The wire, resonant at 10MHz, poses impedance challenges on various bands. Experimenting with direct coax feed and UN-UN transformers, the LDG Z11-Pro2 auto-tuner is found effective but may show deceptive SWR readings. The author employs adjustable UN-UN ratios and introduces a custom "porcupine" coil to optimize the antenna's efficiency.
    [ Hits: 87 | Votes: 0 | Rating: 0 ]
Antennas : Yagi
  • DIY Yagi Antenna - This article describes the phases for the construction of a Yagi antenna. The calculations of the parameters are made using 4NEC2 software. This type of antenna is used for transmissions and receptions of electromagnetic waves. The project shown here refers to the frequency of 433.92 MHz.
    [ Hits: 107 | Votes: 4 | Rating: 3.5 ]
Radio Equipment : HF Transceivers : Yaesu FT-710
  • Yaesu FT-710 QST Review - Yaesu FT-710 AESS MF/HF and 6-Meter Transceiver review on QST
    [ Hits: 124 | Votes: 1 | Rating: 7 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • Yaesu FT-817 Audio Enhancement: Heathkit-inspired Homebrew Project - Inspired by Heathkit, author aimed to enhance his Yaesu FT-817 with audio and RF processing. Design goals included a compact enclosure, PCB simplicity, matching jacks, a visual meter, and a built-in signal generator. Despite challenges in finding a suitable compressor IC for a 5V DC mic jack, he chose the Analog Devices SSM2165/2166 series. Prototyping with a solderless breadboard, author planned a PCB layout for its versatile performance in communication use.
    [ Hits: 80 | Votes: 1 | Rating: 2 ]
Software : Vector Network Analyzer
  • SNASharp - SNASharp is a free software application designed to work with scalar network analyzers compatible with NWT software from DL4JAL. It is used to measure and analyze the scattering parameters (S-parameters) of microwave devices. Provide several measurements and analysis tools including Smith chart, Polar plot, S-parameter tables, Transmission line calculator
    [ Hits: 65 | Votes: 0 | Rating: 0 ]
Technical Reference : Arduino
  • Arduino QRP Transceiver: DIY Success on HF Bands - This article introduces an Arduino-based QRP CW Transceiver designed for lower HF bands. The journey begins with the Wotduino, evolving from a keyer to a multi-mode beacon. The development includes a QRP transmitter and culminates in a receiver inspired by Roy Lewallen design. The transceiver, controlled through a control bus features a signal path, modulation, filtering, and adjustable frequency settings. Despite initial testing intentions, successful QSOs on 80 and 40 meters showcase its functional capabilities.
    [ Hits: 103 | Votes: 1 | Rating: 1 ]
Technical Reference : Components : Toroids
  • RF Toroid Calculator - This RF Toroid Calculator provides graphical calculator used to determine the inductance and other parameters of ferrite and powdered-iron toroids. It simplifies the process of selecting the appropriate toroid for use in radio frequency (RF) circuits
    [ Hits: 102 | Votes: 2 | Rating: 10 ]
Technical Reference : Filters
  • A 2 meter band-pass cavity using surplus Heliax - Cavity is often required at a busy site to not only prevent its receiver from being overloaded by off-frequency signals, but also be a good neighbour and prevent low-level signals from your transmitter from getting into other users receivers - not to mention the preventing of those other signal from getting back into your transmitter to generate spurious signals in its own right.
    [ Hits: 126 | Votes: 2 | Rating: 3 ]
Technical Reference : Morse Code Decoder
  • The CW Typewriter: A Morse Code to ASCII Converter - The CW typewriter is a compact adapter board that transforms Morse code into ASCII characters using an Iambic key. It connects to a computer via USB, emulating the keyboard. The device features inputs for Iambic keying and a WPM speed potentiometer, and outputs for a key and a speaker for side tone. The device can be used with various software and online typing games for practice, offering a unique and interactive way to learn and use Morse code.
    [ Hits: 118 | Votes: 0 | Rating: 0 ]
Technical Reference : Test Equipment
  • Field Strength Meter - The field strength meter (FSM) is a very useful addition to any HAM toolbox. If you are messing around with antennas, or building PA's, or trying to repair some TX gear, the FSM will come to your rescue when there is doubt about the output level.
    [ Hits: 80 | Votes: 0 | Rating: 0 ]
Technical Reference : Transverters
  • 2m to 70cm Transverter Circuit - A 70cm / 432 MHz Transverter Project transverter circuit is an electronic device that converts a radio signal from the 2 meter to the 70 centimeter band and vice versa, allowing a single transmitter/receiver to be used for both bands. It consists of an IF stage, local oscillator, frequency multiplier, and amplifier. The circuit must be designed for minimal signal loss, noise and intermodulation distortion.
    [ Hits: 77 | Votes: 0 | Rating: 0 ]

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