short circuit

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short circuit

11 links

Antennas : 2M

  • Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
    [ Hits: 353 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Dipole Antennas
  • Shorty Forty Antenna - Short dipole antenna for 40 meter ham band. Can be put up in the space required for a 20 meter dipole.
    [ Hits: 12443 | Votes: 8 | Rating: 7.74 ]
Antennas : Multiband
  • Short Antenna for 40-30-20 Meters Band - This page describes an entirely simple, One-Knob matchbox that will match this antenna efficiently on 40, 30 and 20m, using a simple circuit that can be switched between series-resonant and parallel-resonant with just one banana jumper
    [ Hits: 235 | Votes: 1 | Rating: 7 ]
Antennas : Portable
  • Short Whip Antenna Tuner - Here is a circuit that will resonate a short whip antenna for the HF Bands.
    [ Hits: 5862 | Votes: 3 | Rating: 4 ]
Manufacturers : Publications
  • RF Circuit design basics - Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design
    [ Hits: 1271 | Votes: 1 | Rating: 1 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • FT-817 Batteries for Air Travel - Three cell Lipo batteries for the FT-817 work really well, although not really sure about taking them on aircraft. The Lipos intended for use on RC Electric airplanes generally have a very low internal resistance and no internal protection against short circuit.
    [ Hits: 140 | Votes: 0 | Rating: 0 ]
Technical Reference : Batteries : Battery Charger
  • How to Make an Automatic 12V Battery Charger - A home made battery charger 110-220 v AC providing from 1.25-24 v DC Adjustable at 8 Amps output power, with Short Circuit Protection Over Load and over charge Protection.
    [ Hits: 151 | Votes: 0 | Rating: 0 ]
Technical Reference : Coax Cables and Connectors : Testing Coax Cables
  • The Coax Tester - This useful coax tester allows you to screw the PL-259 onto the tester to get a GO/NO GO status. When the LED lights up- you have a short circuit.
    [ Hits: 751 | Votes: 1 | Rating: 2 ]
Technical Reference : Morse Code Oscillator
  • A Morse Code Practice Oscillator - Maybe not state-of-the-art technology but the author offers a quick and easy project for a Morse code practice oscillator using a 555 timer chip
    [ Hits: 138 | Votes: 0 | Rating: 0 ]
Technical Reference : Power Supply
  • A Power Supply on the Cheap - Need a variable power supply that is short circuit protected and over voltage protected; Here is a good one that can be built cheap by VE3IVJ
    [ Hits: 2586 | Votes: 0 | Rating: 0 ]
Technical Reference : Receivers : Regenerative Receiver
  • WD5HOH Regenerative(Regen) Receiver - This web page describes a small, single tuned circuit regenerative receiver primarily for daylight reception in the 16, 19, 22 and 25 meter international shortwave broadcast bands.
    [ Hits: 9365 | Votes: 8 | Rating: 6.5 ]

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