9 1 transformer

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9 1 transformer

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Antennas : 2M
  • Rectangular Loop antenna for 2 meter band - An interesting and easy to build loop antenna for VHF bands, that present a feedpoint impedance of 50 ohms thus avoiding the need for a 1/4 wave impedance transformer. This antenna is ideal for sota and other portable operations
    [ Hits: 275 | Votes: 1 | Rating: 1 ]
Antennas : Baluns
  • How to Make a Great 9:1 RX Transformer - There are lots of good designs for matching transformers for receiving antennas. Make it yourself it's cheap and easy, and very high performance. This is the design used in the TRX-9 transformers.
    [ Hits: 3142 | Votes: 0 | Rating: 0 ]
  • Magnetic Long Wire UnUn 9:1 - An impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input.
    [ Hits: 1929 | Votes: 4 | Rating: 7 ]
  • 1:49 Transformer - This 1:49 transformer is used with wires any multiple of 1/2 wavelength. This is not a matching network, it's a wideband transformer and it has some advantages compared to LC matching
    [ Hits: 2471 | Votes: 25 | Rating: 5.84 ]
  • BalUn for Delta-loop & Quad-loop antennas - This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer.
    [ Hits: 285 | Votes: 1 | Rating: 9 ]
  • 9:1 Unun Impedance Transformer - A 9:1 unbalanced to unbalanced (unun) impedance transformer based on a published design by Peter VK6YSF.
    [ Hits: 195 | Votes: 1 | Rating: 4 ]
Antennas : End-Fed
  • End-Fed 6-40 M Multiband Antenna - This project produces an inexpensive, multiband, end fed HF antenna matchbox, quick and easy to setup. This project creates a trifilar wound, 9:1 UNUN toroid matching transformer. Handles 100W and need an antenna tuner.
    [ Hits: 1989 | Votes: 4 | Rating: 8.25 ]
  • Multiband end fed antennas - This is a 200 Watt PEP step up transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP
    [ Hits: 2273 | Votes: 9 | Rating: 7.32 ]
  • 8010 Enfed Antenna - With this antenna the coverage is 80,40,20,15 and 10 meter band without any antenna tuner and the average SWR is below 1.2 on phone bands. The total antenna lenght is about 23 meters , with one 20.4 meters long segment from the 1:49 transformer to the 110uh coil and about 2.2 meters long segment from the coil to the insulator.
    [ Hits: 137 | Votes: 0 | Rating: 0 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • 1:49 unun for end fed half wave antennas - 1:49 UNUN using two stacked FT240-43 cores for end fed halfwave antenna. To match the end fed half wave antenna to the coaxial feeder, it is necessary to have a matching network or transmission line transformer.
    [ Hits: 386 | Votes: 10 | Rating: 8.1 ]
  • 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 : Multiband
  • HF Multiband end fed antennas - A multiband end-fed antenna that cover 3.5 to 30 Mhz using a 1:64 Balun based on a FT240-43 core
    [ Hits: 3723 | Votes: 6 | Rating: 4.67 ]
Antennas : Theory
  • The Classic Beverage Antenna Revisited - This is a QST Article published in January 1982 by W1FB D. Demaw and HH Beverage and is a complete review of the original article published in 1922, which updates and reivew the beverage antenna theory and developlment, explaining the antenna design of transformers and gives accurate reports on antenna general performance.
    [ Hits: 558 | Votes: 1 | Rating: 6 ]
Antennas : Theory : Impedance matching
  • Matching with one-twelfth-wavelength feed line - Matching with a half wave or wuarter wave coaxial cable is pretty well known, but an existing 1961 system to do that with two one-twelfth-wavelength transmission lines.
    [ Hits: 540 | Votes: 1 | Rating: 10 ]
Antennas : Windom
  • OH7SV Matti Hohtola Ham Projects - The most modern QRP transceiver in 2004,Direct Conversion HF Transceiver with DDS LO, 50 ohm to 200 ohm HF wide band transformers, Wilkinson splitter for RX measurements, Windom baluns 2001/2004, Ferrite rod antenna for 80 meter, Magnetic Loop Antenna for 80 m, Mascot Switched PSU 9320 modification to 8A peak current, 150W MOSFET linear amplifier for 80m, 80 m HF SSB/CW Transceiver
    [ Hits: 20372 | Votes: 36 | Rating: 8.11 ]
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
  • ZS6BKW Antenna - How to Build a ZS6BKW Antenna, an optimised version of the popular G5RV multiband Antenna, basically a random length dipole with a 450 Ohm ladder line acting as a 1:1 transformer by VK4MDX
    [ Hits: 1746 | Votes: 2 | Rating: 7.5 ]
Manufacturers : Power Supply
  • Peter W. Dahl Co. - Custom transformers by Mr. Dahl has been designing specialty transformers and reactors for over 35 years, and has been a licensed Ham radio operator, K0BIT, since 1955.
    [ Hits: 578 | Votes: 1 | Rating: 10 ]
Operating Modes : Digital Voice
  • SM1000 FreeDV Adaptor - The SM1000 allows you to run FreeDV without a PC. Connect the SM1000 to your SSB radio, and you now have Digital Voice (DV). You don’t have to buy a new radio to run Digital Voice! It’s based on a STM32F4 micro-controller, has a built in microphone, speaker amplifier, speaker, and transformer isolated interfaces to your radio.
    [ Hits: 124 | Votes: 0 | Rating: 0 ]
Technical Reference : Arduino
  • WIFI Remote FUCHS ATU for EndFed Antenna - The Fuchs Antenna tuner with a resonant circuit as a coupler. The Fuch Antenna Tuner is providing a high-efficiency compare to a 49:1 transformer using ferrite . The Fuchs tuner is a resonating L/C circuit to step-up the impedance from 50 Ohm to the required 3k. The ATU is able to perform automatic tuning with the addition of a tiny Aduino Nano and a SWR bridge.
    [ Hits: 114 | Votes: 0 | Rating: 0 ]

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