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Antennas : 20M : 20 meter Vertical Antennas
  • The Vertical Buddi Beam for 20m - The Vertical Buddi Beam on 20m using no Coils. n this article I am going to describe a totally new way to construct and use a very old design the two element Yagi antenna. Unlike the traditional Yagi this design does not require a Tower or a boom, it is 100 percent portable and most important high- performance and easy to assemble using standard Buddipole components.
    [ Hits: 569 | Votes: 2 | Rating: 4.5 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • End-Fed Half-Wave Antenna for 20m 40m 80m - How to Design and Build a Field Expedient End-Fed Half-Wave Antenna for 20m, 40m and 80m. This Shorty 80m EFHW comprises a 49:1 autotransformer (to match the very high impedance at the end of a half-wave wire), a half-wavelength wire for 40m (also a quarter-wavelength for 80m), a loading coil and a short tail wire. The coil and the short tail wire (about 6 feet) make up the other quarter wave on 80m.
    [ Hits: 139 | Votes: 1 | Rating: 4 ]
Antennas : Halo
  • Halo Antenna for 50 MHz - The antenna described in this article is for 50 MHz, but the design can be scaled for any band, including VHF, UHF, or even the higher HF bands. The antenna is nothing more than a square loop of wire, approximately 30" (or ~76cm) per side. The loop is fed in the middle of one side, and the opposite side to the feed point has a gap in it.
    [ Hits: 292 | Votes: 0 | Rating: 0 ]
Antennas : Helical
  • Helical Antennas for 144 MHz - This article is about two excellent small helical antennas for the two meters band. With performance close to that of full sized antennas, these small helical antennas are low in profile but high in efficiency.
    [ Hits: 227 | Votes: 1 | Rating: 7 ]
Antennas : Installation
  • Introduction to HFTA HF Terrain Assessment - A complete guide to plan antenna installation by using several tools and resources including the popular HFTA High-Frequency Terrain Assessment software distributed by ARRL. A full tutorial on how to use it and how to interpretate reports produced by this antenna setup analysis tool.
    [ Hits: 135 | Votes: 1 | Rating: 7 ]
Antennas : Magnetic Loop
  • Magnetic Loop Antennas for 40-80-160m - This magnetic loop DIY site is ment to be an introduction into making DX high quality magnetic loop antennas that will beat any dipole
    [ Hits: 231 | Votes: 2 | Rating: 8.5 ]
Antennas : Quad
  • Build a Stronger 2 Element Quad - A Different way to construct a tried and true antenna out of PVC, especially for the 10 meter and higher frequencies.
    [ Hits: 149 | Votes: 0 | Rating: 0 ]
  • The Swiss Quad Antenna - Rotatable Antenna with Phased Elements based on the orignal design concept of HB9CV antennas, is considered to have an higher gain than standard quad antennas. The Swiss Quad Antenna does not need any spreader or boom.
    [ Hits: 361 | Votes: 3 | Rating: 7.67 ]
Antennas : Theory
  • Yagi Antenna Design by G4CQM - A selection of technical articles and analysis offering guidance and insight to enable you to recognise and build your own high performance yagi design.
    [ Hits: 116 | Votes: 1 | Rating: 10 ]
Manufacturers : Accessories
  • Pro Audio Engineering - High-quality products for broadcast and amateur radio. Kx33 Low-RFI AC Power Supply for HF Transceivers, Elecraft Heatsinks, Fair-Rite Mix 31 Ferrites
    [ Hits: 118 | Votes: 0 | Rating: 0 ]
Manufacturers : Digital Mobile Radio
  • Kydera - A high-technology enterprise specializing in the R&D, production and sale of two-way radio equipment for over twenty years. DMR Radio, Digital and analog portable radio manufacturer based in China
    [ Hits: 32 | Votes: 0 | Rating: 0 ]
Manufacturers : Microwave
  • Kuhne Electronic - High quality microwaves components for professional and radioamateurs. Power Amplifiers, Low Noise Amplifiers, Es hail 2 Converter Transverter, Signal Sources, Passive Components and Accessoires
    [ Hits: 102 | Votes: 0 | Rating: 0 ]
Manufacturers : Software Defined Radio
  • (tr)uSDX - The (tr)uSDX is a 5-Band / Mulitmode QRP Transceiver in Pocket Format (90x60x30mm - 140g). It features a highly efficient Class E PA and Supports CW/LSB/USB and AM/FM. Right now it covers 80/60/40/30/20m and in Future there will be support for 17/15/12/10m
    [ Hits: 200 | Votes: 2 | Rating: 10 ]
Technical Reference : Amplifiers : HF Amplifiers
  • 20 W HF Power Amplifier - A HF power amplifier with a push-pull of AFT09MS015N. The (small-signal) gain of the amplifier is around 26 dB in the lower HF band and goes down to about 24 dB on the higher end and still around 21 dB at 50 MHz. Its input matching is relatively good at the lower HF and degrades above 10 MHz.
    [ Hits: 169 | Votes: 0 | Rating: 0 ]
Technical Reference : Amplifiers : UHF Amplifiers
  • Homebrew 1 Watt 2.4 GHz Power Amplifier - This will show you how to add a RF power amplifier to your Proxim Symphony for under $50. The cost is reduced by using the existing components on the Symphony, such as the PIN diode switch, and just inserting a higher power final amplifier. Increase the RF output power of your wireless network card to 1 Watt.
    [ Hits: 157 | Votes: 4 | Rating: 6.5 ]
Technical Reference : Arduino
  • Universal HF Tracker - The PCB can produce a High Frequency RF signal in the range of 1MHz to 12.5MHz using an AD9833 Direct Digital Sequence (DDS) frequency synthesizer. The signal can be modulated with different Weak Signal modes such as WSPR, JT9 and JT65 using our Arduino 5V/16MHz Pro Micro software.
    [ Hits: 141 | Votes: 0 | Rating: 0 ]
  • WIFI Remote FUCHS ATU for EndFed Antenna - The Fuchs Antenna tuner with a resonant circuit as a coupler. The Fuch Antenna Tuner is providing a high-efficiency compare to a 49:1 transformer using ferrite . The Fuchs tuner is a resonating L/C circuit to step-up the impedance from 50 Ohm to the required 3k. The ATU is able to perform automatic tuning with the addition of a tiny Aduino Nano and a SWR bridge.
    [ Hits: 114 | Votes: 0 | Rating: 0 ]
Technical Reference : Audio
  • JRC NVA-88 Modification - Adding 2 RCA inputs, 1 high impedance filtered audio output RCA 3, 3 HIGH PASS filters, 3 LOW PAS filters to the JRC NVA88 Speaker
    [ Hits: 54 | Votes: 0 | Rating: 0 ]
Technical Reference : Calculators
  • Bandpass Filter Calculator - Passive Bandpass Filter online calculator and filter formulas. Active Inverting Op Amp Bandpass Filters, Active Noninverting Op Amp Bandpass Filter, just enter the Low ir High Cutoff Frequency
    [ Hits: 157 | Votes: 3 | Rating: 5.33 ]
Technical Reference : Homebrew
  • 40 Segment LED S-Meter - Provide your radio with a very string signal, then adjust the HIGH LEVEL pot to the threshold of illuminating the last LED (all LEDs on).
    [ Hits: 92 | Votes: 0 | Rating: 0 ]

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