4 sq antenna

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4 sq antenna

50 links - and 1 categories

Antennas : 2M
  • 2m Quad Turnstile Antenna - The loops are made of 10 mm round aluminum tube. No bending pliers was used to gently bend 90 degrees to obtain a square with 53 cm inner sides. Each loop has an impedance of approximately 100 Ohm. To connect both radiators in phase, a quarter wave long feeder of 100 Ohm is required.
    [ Hits: 207 | Votes: 0 | Rating: 0 ]
  • VHF Bi-Square Beam Antenna - 2 Wavelength ,2 Meter Bi-Square Beam , 5dbd gain. This antennas are very cheeap to build and their radiation pattern is similar to a figure 8 with maximum signal through the loop but they may be used as a near-omnidirectional antenna
    [ Hits: 185 | Votes: 2 | Rating: 9 ]
Antennas : 6M : 6 meter Yagi Antennas
  • 6 Elements Yagi Antenna on 50 MHz - This is a design based on the QuickYagi 4 software by WA7RAI with some changes for practical reasons. The beam uses 6.5 metres of standard 25mm square boom, 12mm diameter elements without tapers. The actual boom length used is 6.3 metres and all parts are readily available.
    [ Hits: 131 | Votes: 2 | Rating: 6 ]
Antennas : Receiving
  • 160 Meters 4 Square Receive Antenna - A four square array receiving antena for the top band, performance is extremely directional and space requirements are really hard to fulfill.
    [ Hits: 178 | Votes: 1 | Rating: 10 ]
  • RX Loop antenna - This loop antenna is intended to be connected as an antenna for receivers that do not have a built-in antenna such as an HF set or an old tube radio. This square barrel is wound on a wooden frame. It consists of two windings that are galvanically isolated from each other, a main and a coupling winding. The diameter is about 40 cm.
    [ Hits: 60 | Votes: 0 | Rating: 0 ]
  • Chokes and Isolation Transformers for Receiving Antennas  new - Chokes and isolation transformers are essential for receiving antennas to mitigate common mode current, which induces noise and interferes with signal quality. Common mode chokes, formed by winding feedline through ferrite cores, block unwanted current effectively. Proper selection of core material and winding turns ensures resonance near the operating frequency, reducing interference. Isolation transformers further minimize interference, crucial for multi-transmitter stations.
    [ Hits: 52 | Votes: 1 | Rating: 9 ]
Antennas : Theory : Impedance matching
  • Performance of 49:1 Ferrite Core Transformers - There are quite a few recipes for building a suitable transformer for an end fed half wave antenna (EFHW), but I was never sure I really understood the main principles. So, I wound a bunch of transformers, made measurements on them using my NanoVNA, learned how to get what I really wanted out of the VNA measurements, and in the process discovered how to build better transformers and be able to predict what they will do
    [ Hits: 151 | Votes: 4 | Rating: 7 ]
Antennas : Wire
  • The Squid Pole Wire Antenna Re-visited - The author explores enhancing the performance of a 7-meter fiberglass squid pole wire antenna for amateur radio. The wire, resonant at 10MHz, poses impedance challenges on various bands. Experimenting with direct coax feed and UN-UN transformers, the LDG Z11-Pro2 auto-tuner is found effective but may show deceptive SWR readings. The author employs adjustable UN-UN ratios and introduces a custom "porcupine" coil to optimize the antenna's efficiency.
    [ Hits: 87 | Votes: 0 | Rating: 0 ]
Antennas : ZS6BKW
  • Revisiting the GR5V and ZS6BKW Multi-band Antennas - NEC models are used to explore the GR5V and ZS8BKW optimizations. A third optimization is also rediscovered. The effect of fixed lengths of 75 ohm coax are explored. A link to the NEC model is provided.
    [ Hits: 310 | Votes: 1 | Rating: 10 ]
Manufacturers : Antennas : HF : Vertical Antennas
  • DX Commander Antennas - DX Commander produces economical multi-band antennas available in kit form. 4 Square array vertical antennas, vertical multiband antennas, sota and travel antennas
    [ Hits: 273 | Votes: 0 | Rating: 0 ]

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