4 wire

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4 wire

279 links

Antennas : 10M
  • 2 Element Wire Yagi for 10 meters band - A page with an embedded video about a two elements yagi antenna for 28 MHz based on the original antenna design by VE7CA
    [ Hits: 276 | Votes: 1 | Rating: 8 ]
Antennas : 160M
  • Experiments with 160m antennas - Experimentin wire antennas on top band using several type of aerials. This includes a 40 to 160 meters EndFed Half Wave kite antennas and 160m/80m loaded vertical antenna.
    [ Hits: 177 | Votes: 0 | Rating: 0 ]
Antennas : 2M
  • An 8x2 Element Array Antenna For 144 MHz - This stacking offers a well known simple phasing technique. All elements can be fed in parallel by open wires provided that they are fed in phase. This can be achieved by twisting the open wire phasing-lines at 180 degrees.
    [ Hits: 164 | Votes: 0 | Rating: 0 ]
Antennas : 30M
  • SAFARI 40-30m vertical Antenna - Roach pole vertical antenna for 40 and 30 meters band featuring good performance on short skips contacts compared to wire dipole
    [ Hits: 302 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Dipole Antennas
  • 40-80 Coax Trap Dipole - Full article on how to build a home-made wire dipole antenna for 40 and 80 meters band. Article is fully in italian, as it was published on ARI RadioRivista, but is plenty of self explaining pictures that will guide you on homebrewing this trapped dipole antenna for the lower amateur radio bands.
    [ Hits: 261 | Votes: 3 | Rating: 9.33 ]
Antennas : 80M
  • 80m Inverted-L 12m Spiderpole - An Inverted-L with its long leg sloping to the ground. It will still work very good, even if the horizontal wire has to be sloped diagonally to the ground, as long as you have enough horizontal space to keep it at about a 45 degree angle or more from the pole.
    [ Hits: 147 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators 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 : End-Fed
  • The Pop-Up Vertical 2.0 - Basically, this antenna is a 23-foot wire fed through a 4:1 un-un transformer. This antenna can be easily used in portable operation, for operating all bands from 40-10 meters.
    [ Hits: 253 | Votes: 0 | Rating: 0 ]
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
  • Homebase 10 - The Homebase-10 is a simple to make wire halo antenna for 10m (28MHz) built using parts available from the local DIY store. The resulting antenna is very effective on 10m despite its small size and light weight. Also shown is a dual-band version for 10m and 6m.
    [ Hits: 322 | Votes: 1 | Rating: 3 ]
Antennas : Loop
  • 40m Loop Antenna - This project is a full wavelength, horizontal, loop antenna for the 40 metre Amateur Radio band, built using insulated copper wire in a diamond shape, supported by egg insulators, tethered to 4 masts, each 6.5m high
    [ Hits: 192 | Votes: 0 | Rating: 0 ]
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
  • The 2BD beam antenna for 20 meters - A light portable 2 element Delta beam antenna for 14 MHz. It is basically a two element delta loop wire antenna made for portable usage providing good directivity and a 4.2 dBd gain
    [ Hits: 183 | Votes: 1 | Rating: 8 ]
Antennas : Stealth
  • Balcony Vertical HF Antenna - The simple balcony vertical HF antenna made with plastic fishing pole. Just along the pole I install copper wire in 7 meter length. Then was installed ATU. It was used home brew tuner. For each band was used one counterpoise in length 0.8 x lambda/4
    [ Hits: 237 | Votes: 0 | Rating: 0 ]
  • Balcony Dipole Antenna for 20 Meter - Antenna may be made practically from any wire (strand, solid) having a reasonable diameter 0.5 2.0 mm (24- 12 AWG). Antenna may be installed at any balcony of 3 to 6 meter length.
    [ Hits: 338 | Votes: 3 | Rating: 10 ]
Antennas : Theory
  • The Weird Antenna Wire End Effect - A half wave wire that is tuned for resonance on 80m will NOT be resonant on 40m despite a precise harmonic relationship between the two bands. The End Effect is caused by a capacitive coupling between an unterminated wire end and the ground.
    [ Hits: 92 | Votes: 0 | Rating: 0 ]
Antennas : Vertical 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 : Coax Cables and Connectors
  • Pinouts Reference Tables - Tables for keyboardsm, montiros, mouse for PC, SUN, MAC, USB,mini usb, DVI, FireWire, RS232, Digital Flat Panel and EVC configurations
    [ Hits: 117 | Votes: 0 | Rating: 0 ]

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