log antenna

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log antenna

344 links - and 2 categories

Antennas : 40M : 40 meter Vertical Antennas
  • Shortened 40 meter Vertical for POTA SOTA - Build A Shortened 40 Meter Vertical antenna For POTA / SOTA Activations. A project for a portable wire antenna for 40 meters band suitable for POTA or SOTA operations.
    [ Hits: 124 | Votes: 1 | Rating: 10 ]
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 : Antenna Calculators
  • Double BiQuad Antenna Calculator - Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g
    [ Hits: 152 | Votes: 2 | Rating: 5.5 ]
Antennas : Baluns Antennas : Capacitive
  • Microvert Antenna for 40m by ON7IR - A mircovert antenna assembled for the 40m version of the DL7PE antenna. A one meter long aluminum tube with 24mm diameter is used for the base (element 1) and a 50cm aluminum tube with 20mm diameter for element 2 (the extention). A pvc pipe, 34cm long and with a diameter of 38mm, is used to wind the coil on (1mm enamelled copper wire).
    [ Hits: 149 | Votes: 0 | Rating: 0 ]
Antennas : CobWeb
  • A Cobwebb antenna homebrew - A homebrew cobwebb antenna for HF bands covering from 10 to 20 meters band.
    [ Hits: 175 | Votes: 1 | Rating: 10 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • HF EFHW Antenna Antenna Tuner - Schemaric diagram for a 80m, 40m, 30m, 20m EFHW Antenna Antenna Tuner. The tuner has been designed for an antenna length of 41m and the counterpoise 7.5m.
    [ Hits: 117 | Votes: 0 | Rating: 0 ]
Antennas : Horn
  • What is Horn Antenna - Horn Antenna - The energy of the beam when slowly transform into radiation, the losses are reduced and the focussing of the beam improves. A Horn antenna may be considered as a flared out wave guide, by which the directivity is improved and the diffraction is reduced. One of the first horn antennas was constructed in 1897 by Bengali-Indian radio researcher Jagadish Chandra Bose in his pioneering experiments with microwaves. The modern horn antenna was invented independently in 1938 by Wilmer Barrow and G. C. Southworth. This Horn model antenna is suitable employed in the UHF or SHF radio bands. Making this horn model antenna it will be easy for a beginner to make if it works in the 10GHz frequency, because small dimensions so it is not so difficult and also offers gain up to 25dBi.
    [ Hits: 74 | Votes: 0 | Rating: 0 ]
Antennas : Log Periodic
  • Log Periodic Dipole Array Calculator - Description and online calculator for Log Periodic Dipole Arrays LPDA are directional antennas featuring a relatively constant characteristics across a wide frequency range.
    [ Hits: 222 | Votes: 2 | Rating: 6 ]
Antennas : Masts and mounts
  • Drive-On Antenna Mast For POTA - This antenna mast mount uses two Reese hitch extensions that are welded on to a piece of 2 inch square tube. It comes apart in two pieces. The vertical pipe on the left is welded on to a 2 inch piece of square tube that fits into the Reese hitch extension.
    [ Hits: 151 | Votes: 1 | Rating: 9 ]
Antennas : Microwave
  • Double BiQuad Antenna for 2.6 GHz - This is basic instructions for homemade 4G Antenna working on 2600 MHz UMTS featuring 13 14 dBi gain. This antenna is desigend to resonate on microwave frequencies in two segments from 2500 to 2570 MHz for Uplink, and from 2620 to 2690 MHz for Downlink.
    [ Hits: 85 | Votes: 0 | Rating: 0 ]
Antennas : Satellite
  • Satellite Yagi crossed 2m, 70cm - Construction of an antenna for experimental satellite communication, 8el. (435 Mhz) x 4el. (145 Mhz) Satellite Yagi crossed. No difficulty to built this antenna. Except the gamma match. that requires a little more attention
    [ Hits: 145 | Votes: 0 | Rating: 0 ]
Antennas : Shortwave
  • Dual-Band X-Frame Shortwave RX Loop Antenna - A dual band X-frame wire antenna made using 4 turns for response down to 3 MHz or so, and 2 turns (switched) for response up to around 18 MHz. The loop configurations are tuned using common eBay 365 pF tuning caps.
    [ Hits: 148 | Votes: 1 | Rating: 10 ]
Antennas : Theory : Antenna Gain Ham Radio : Blogs
  • ZS1II VE2EK Amateur Radio Blog - Amateur radio blog about Homebrew equipment,ham radio antennas, satellites, QO-100 operations, rf amplifiers, 2m ldmos amplifier, 70cm ldmos amplifier, 23cm ldmos amplifier
    [ Hits: 115 | Votes: 3 | Rating: 8.67 ]
Operating Modes : Portable Operations
  • Portable Operating Tips for Ham Radios - This article is from the book Ham Radio For Dummies and features some tips for portable amateur radio operations, on Field Day or generic outdoor operation, like selecting the proper antenna and portable power.
    [ Hits: 79 | Votes: 1 | Rating: 10 ]
Operating Modes : Satellites : CubeSats
  • Greencube (IO-117) Guide to Setup, Software and Operation - Explore the detailed setup, essential software, and operational nuances for Greencube (IO-117), a Medium Earth Orbit (MEO) satellite with a 70cm digipeater, offering DX possibilities for amateur radio enthusiasts. From antenna configurations to software choices, this guide covers everything for a successful Greencube experience.
    [ Hits: 136 | Votes: 0 | Rating: 0 ]
Technical Reference : Antenna Switch
  • Smart SO2R Antenna Switcher: A DIY Solution - In pursuit of enhanced station efficiency, the author describes crafting an Arduino-based smart antenna switcher for an SO2R setup. Faced with manual antenna switching challenges during contests, the project utilizes a Logos Electromechanical 4x4 Driver Shield and a Power Screw shield for seamless functionality. Despite its raw appearance, the automatic switcher proves indispensable in contest scenarios, prompting considerations for future improvements and standardization of station control protocols.
    [ Hits: 152 | Votes: 0 | Rating: 0 ]
Technical Reference : Arduino
  • Automatic antenna switch with Arduino Nano - Arduino Nano board based antenna coax antenna switch intended for use with ICOM CI-V protocol. When is used alone with transceiver without PC control (CAT software, any logging software with CAT functionality), the CI-V transceive option in TRX setup shall be set to ON.
    [ Hits: 141 | Votes: 1 | Rating: 9 ]
Technical Reference : Test Equipment : RF Probe
  • A Simple Field Strength Meter - Mad your own simple FS meter. It is the simplest thing to make and is good enough to see if the antenna under test is radiating more power than your old ground plane, old mobile vertical or just radiating at all in a particular direction or in all directions.
    [ Hits: 158 | Votes: 0 | Rating: 0 ]

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