small hf

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small hf

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Antennas : Dipole
  • Small HF Antennas - Experiments on HF antennas for restricted spaces. In this article author experiments antennas for 80-10 meters band having just a very small garden and several restrictions. Basic antennas consists of laded multiband dipoles and fan dipole antennas
    [ Hits: 1014 | Votes: 19 | Rating: 7.31 ]
Antennas : End-Fed
  • Multiband End-fed 80-10m Antenna - A multi band antenna for HF band capable to operate from 10 to 80 meters band depending on wire lenght loaded with a small inductance neat the feed end.
    [ Hits: 366 | Votes: 2 | Rating: 6.5 ]
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 : Magnetic Loop
  • QRP HF Loop Antenna - This is an uncommon loop antenna, hombrewed without the small feeding loop. With small spare parts is possible to build a loop antenna tuner for portable usage tha can ben used with common HF QRP transceivers
    [ Hits: 160 | Votes: 1 | Rating: 10 ]
Antennas : Multiband
  • Open-Folded W8JK Antenna for HF - Originally designed by John Kraus, W8JK in about 1940, this antenna has some interesting properties. The W8JK antenna is 2 (Two) centre-fed double-dipole fed by a pair of anti-phase signals. Small size, simple antenna, offer nice performance but need a tuner. Tested in this project from 30m to 6m bands
    [ Hits: 139 | Votes: 1 | Rating: 3 ]
Antennas : Receiving
  • The Loop on Ground Antenna - An experimental antenna for HF reception. It consists of a single loop element mounted on the ground. It is stealthy, small, and quiet. EZ-NEC plots and on-air test results are included.
    [ Hits: 299 | Votes: 3 | Rating: 8 ]
  • Small HF RX Loop - This is very common W7IUV Flag Antenna design is based on the PY3AGD antenna because it uses the antenna mounted horizontally and nd it is perfect for my small city lot installation.
    [ Hits: 147 | Votes: 0 | Rating: 0 ]
Antennas : VHF UHF
  • Small DuoBand Antenna - This small dual band UHF VHF directional antenna is good choice for portable operations. This antenna is composed by a moxon antenna for the two meters band and it includes two parastatic elements for 70 cm band.
    [ Hits: 195 | Votes: 1 | Rating: 2 ]
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 ]

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