rf antenna

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rf antenna

430 links - and 1 categories

Antennas : 40M
  • Modeling the W6NL 40m Moxon - This note looks at the antenna and antenna model for the 40 meter Moxon Yagi designed by Dave Leeson, W6NL. The performance of the antenna, through the model, will be explored in several typical settings.
    [ Hits: 2253 | Votes: 7 | Rating: 8.14 ]
Antennas : 6M : 6 meter Yagi Antennas
  • 3 Element Yagi Antenna Plan for 6 meter - A short boom, wideband 3 element yagi antenna plan for six meters that cover the entire band with a resonable performance and a 50 Ohm SWR of less 2:1. Article appeared in QST August 2007
    [ Hits: 1291 | Votes: 0 | Rating: 0 ]
Antennas : 80M
  • 80m Limited Space Antenna - 46ft multi-band antenna for small gardens. Works well on 80m. An excellent DX performer and is an ideal replacement for your half size G5RV
    [ Hits: 4125 | Votes: 5 | Rating: 6 ]
Antennas : Feed Lines : Choke
  • Trap on Coax Cable - A trap on the coaxial cable, also known as choke, helps to eliminate the sneaking of the reflected RF- energy to the shack. The trap can be made from the coaxial cable that feeds the antenna
    [ Hits: 961 | Votes: 2 | Rating: 6.5 ]
Antennas : Indoor
  • Testing Dipole vs Indoor Magnetic Loop Antenna - Testing performances of indoor antenna. A comparison of a magnetic loop antenna vs a classic wire dipole done using wsprlite on 30 meters band.
    [ Hits: 855 | Votes: 2 | Rating: 5.5 ]
Antennas : Magnetic Loop
  • The Balcony Mounted Magnetic Loop Antenna - A NEC Model Comparative Analysis of Physical Orientation and Performance. The small magnetic loop is a useful compromise antenna for limited space and portability. For this reason, the magnetic loop antenna is a practical high frequency antenna solution for the restricted space of apartment dwellers
    [ Hits: 815 | Votes: 3 | Rating: 9.67 ]
  • Magnetic Loop Antennas  updated - A complete guide to magnetic loop antenna construction, with analysis of multi-turn and single-turn magneti loops, and and insight on choosing the optimal capacitor, or homebrewing your own butterfly capacitor
    [ Hits: 1251 | Votes: 1 | Rating: 10 ]
Antennas : Tuners
  • QRP Z-Match Tuner 40-10m - The Z Match is really a basic L Match consisting of a series capcitor and variable shunt inductor, coupled to the antenna using the RF transformer action.
    [ Hits: 1799 | Votes: 0 | Rating: 0 ]
Antennas : VHF UHF
  • VHF UHF Coaxial Dipole Antenna - A base station antenna you can easily build for 146,220 or 440 MHz, with performance similar to a J-pole but smaller and less obstrusive
    [ Hits: 2922 | Votes: 15 | Rating: 5.55 ]
Antennas : Vertical
  • Radials on Vertical Antennas - Experimental Determination of Ground System Performance for HF Verticals
    [ Hits: 1396 | Votes: 9 | Rating: 6.67 ]
Antennas : Yagi
  • Simple Gain Antennas for the Beginner - You do not need to invest an absurd amount of money to build a beam type of antenna. Good performance can be obtained with simple antennas made from some very ordinary materials. QST article
    [ Hits: 1059 | Votes: 4 | Rating: 6.5 ]
Manufacturers : Accessories
  • Hofi - Hofi Hochfrequenztechnik, RF switches, antenna tower and antenna manufacturer, owner of the versatower and fritzel brand names based in Germany
    [ Hits: 350 | Votes: 2 | Rating: 6.5 ]
Propagation : Resources
  • What is Radio Propagation - RF propagation - Discover the key facts about what radio propagation is, the different types available and how they affect different frequencies.
    [ Hits: 198 | Votes: 1 | Rating: 10 ]
Radio Equipment : HF Amplifiers : Acom 1000
  • Mod for Acom 1000 amplifier - The problem originates by improper TXOUT-to-RF timing (RF transmission exists still after a TX-EN prohibition), combined by too long decay of their CW pulses.
    [ Hits: 509 | Votes: 0 | Rating: 0 ]
Technical Reference : Arduino
  • Arduino Antenna Rotator Controller - This is an attempt to build an Antenna rotator controller using Arduino Mega 2560 with a nice user interface showing the actual position of the antenna.
    [ Hits: 2316 | Votes: 14 | Rating: 6.71 ]
Technical Reference : QRM Eliminator
  • PlasmaTV QRN Eliminator - An improved version of DK9NL QRM Killer, with dedicated noise sampling antenna for completely filtering of plasma TV rattle on HF bands
    [ Hits: 898 | Votes: 0 | Rating: 0 ]
  • Noise Canceller Project - This project was intended to accompany the stealth antenna project. Author want to see how effective a noise canceller could be in reducing the background noise floor when attic / stealth antennas are being used.
    [ Hits: 708 | Votes: 0 | Rating: 0 ]
Technical Reference : RF Safety
  • RF Safety in Tower Climbing - The risks for exposure to significant levels of RF radiation is high for tower climebers, the RF field levels near FM radio and television antennas are extremely high.
    [ Hits: 192 | Votes: 0 | Rating: 0 ]
  • Magnetic Loop RF Safety - Notes on the intensity of RF Field calculated on magnetic loop antennas. The magnetic field intensity of a mag loop is considerably higher than the E field probably due to the inductive portion of the resonant circuit creating the radiation (magnetic) in the near field
    [ Hits: 856 | Votes: 3 | Rating: 4 ]
Technical Reference : Receiver Front-End Protector
  • RF Front End Protector - If You are using a separate receive antennas then you need a good protection circuit to eliminate the possibility of blowing out the receiver front-end while using these auxiliary receive antennas specially on low bands.
    [ Hits: 176 | Votes: 0 | Rating: 0 ]

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