4m band

4m band

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• 4m Tall Vertical Dipole for 20m - Constructed in May 2008, this innovative 4m tall electrically full-size halfwave vertical dipole, tunable to multiple bands, offers HF coverage despite its space-saving design. Inspired by cost-effective DIY alternatives, the antenna design departs from conventional center-fed approaches, utilizing asymmetrical dimensions. Despite resonance challenges, the antenna's performance remains viable, boasting broad bandwidth and adaptability, as demonstrated through SWR measurements and EZNEC predictions.
  [ Hits: 93 | Votes: 0 | Rating: 0 ]

• A 7 elements 144MHz yagi antenna - A home made project for a 7 element yagi antenna for the two meters band based on the DK7ZB original desing.
  [ Hits: 86 | Votes: 0 | Rating: 0 ]

• 40m 2 elements HQ Traps Yagi - The longest element has a total length of 14m and has a boom length of 5.5 meters featuring a total bandwith of 166 kHz
  [ Hits: 174 | Votes: 1 | Rating: 8 ]

• 70 MHz 4m Slim Jin Antenna with Ladder Line - An experimental slim jim antenna for 70MHz band made with a wireman slotted line.
  [ Hits: 256 | Votes: 1 | Rating: 1 ]

• TriBand Moxon Antenna for 6m 4m 2m - A PDF presentation of a home made moxon antenna for 50 MHz 70 MHz and 144 Mhz. The project is mainly out of surplus plastic Plumbing pipes and clips etc, and also details of how the dimensions were calculated.
  [ Hits: 1363 | Votes: 7 | Rating: 7.11 ]

• Top Loaded Vertical Antenna for 80 Meters Band - Top Loaded Vertical Antenna 3,5 MHz 80m and a 14 MHz Trap for the 20m band. The weight of this portable vertical antenna is less than 1 kg, including the ground network. The weight of the telescopic fiberglass fishing rod is another 1kg. The rod expands from 1.5 meters to 8 meters.
  [ Hits: 268 | Votes: 0 | Rating: 0 ]

• Modeling an 80/40/20M Fan Dipole for DX - An interesting presentation of a real multiband Fan Dipole antenna, optimized for better DX operation performances, considering the terrain, position, DX destination path and other influencing factors
  [ Hits: 539 | Votes: 2 | Rating: 5.5 ]

• The Lindenblad Antenna - Presentation - This is a presentation used at OVARC on the LindenBlad antenna construction. The presentation cover several topics about this antenna, from the basic antenna design, to the guide on how to contruct a custom lindenblad antenna for the 2 meters band and and 70 centimenters band.
  [ Hits: 645 | Votes: 0 | Rating: 0 ]

• UHF VHF Crossed Satellite Yagi Antenna - This home made antenna provides around 10.5dBd gain on 70cm, and 6.5dBd gain on 2m, which is more than adequate to work the FM satellites with a handheld dual band radio
  [ Hits: 380 | Votes: 2 | Rating: 9 ]

• 20-30m Vertical Antenna - Homebrew project for a vertical antenna with a coaxial-cable trap, that works on 20 and 30 meters band.
  [ Hits: 73 | Votes: 0 | Rating: 0 ]

• Kenwood TS890S Mods - Doing the MARS Mod on the TS890S. This will take care of any of your HF or Mars needs, and any new bands added in the future. You will now have the new 60m Band also. It is unclear if it will open up the 4m Band that some EU Countries are now allowed.
  [ Hits: 115 | Votes: 2 | Rating: 10 ]

• Measured Data For HF Ferrite Chokes - FT-240 toroids measurements. The data was measured using well-calibrated HP instrumentation. All plots have been adjusted to a frequency range of 1-100 MHz on the horizontal axis and a resistance/impedance range of 10-1,000 ohms on the vertical axis. This adjustment facilitates comparison among different materials and aids in determining their suitability for use on the HF ham bands.
  [ Hits: 38 | Votes: 0 | Rating: 0 ]

• Homebrew a High Performance SSB RTX for 14 MHz - This article describes the construction of a high performance transmitter and receiver for SSB (voice) communication covering the 14MHz (20 meters) high frequency amateur radio band with output range 15 to 20 watts and a top audio sound quality both on transmit and receive.
  [ Hits: 346 | Votes: 5 | Rating: 7.8 ]

• Portable SSB transceiver for 14MHz - 20W portable handheld SSB transceiver for 20 meters band
  [ Hits: 177 | Votes: 1 | Rating: 7 ]

• SDR Receiver with RTL-SDR and Gnu Radio - This project is a Software Defined Radio Receiver. It has a frequency range of 24MHz 1.2GHz. It can demodulate AM, FM, USB, LSB with selectable bandwidths of 600, 2400, 2800, 3200 and 6400Hz. Using a simple RTL-SDR Dongle and Raspberry Pi 3 computer using GNU RADIO
  [ Hits: 484 | Votes: 1 | Rating: 1 ]

• 4m QRP Transverter - There are few equipment for the 4m band, so to get on the band it could be necessary to design and build a simple transverter.
  [ Hits: 96 | Votes: 0 | Rating: 0 ]

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