5 watt

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5 watt

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Antennas : End-Fed
  • End Fed Antenna for WARC Bands - I used a FT 240-43 for much more power, not needed but beter safe than sorry. 150 Watt continious, 300 Watt PEP SSB, 90 Watt Digimodes 10 Mhz, 18 Mhz, 24 Mhz Very easy to build design and a good antenna for people who don't have much space for big towers or long wires This design is from Hans - PE1RNU
    [ Hits: 180 | Votes: 1 | Rating: 3 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • 40m QRO End Fed Half Wave Antenna Coupler - A medium power End Fed Half Wave Antenna coupler, specifically tuned to the QRP frequency of 7030 kHz. Constructed from coil stock and capacitors, it achieves an impedance ratio of 64:1. The coupler has proven effective for power ranges from 2 to 100 Watts on the 40m band.
    [ Hits: 102 | Votes: 0 | Rating: 0 ]
Antennas : Tuners
  • Portable T-Match ATU - Homebrew Portable T-Match ATU, VK1AD Portable T-Match Antenna Tuner (ATU) mounted in a plastic case, T-Match ATU Schematic – 3.5 to 52 MHz power rating 80 watts
    [ Hits: 99 | Votes: 1 | Rating: 8 ]
Radio Equipment : HF Transceivers : Yaesu FT-857
  • Yaesu FT-857 Repair: Tackling a Sense Wire Issue - After owning the second-hand radio for a few months, it developed a sense wire failure, limiting output to 20 watts. Yaesu support advised the owner, an Electrical Engineer, to investigate. The issue was traced to a blown digital transistor, Q1032. Yaesu provided free replacements, revealing intricate internal components during the repair.
    [ Hits: 40 | Votes: 0 | Rating: 0 ]
Technical Reference : Attenuators
  • 40 dB Tap Attenuator - A 40 dB tap attenuator taht need only dissipate 2.3 watts, while delivering the same 0.02 watts to the input sensor.
    [ Hits: 63 | Votes: 0 | Rating: 0 ]
Technical Reference : Dummy Loads
  • QRP Dummy Load - This is another variation on the parallel resistor, dummy load. It is perfect for QRP HF operation of 5-watts or less average power, and should be adequate for continuous operation at that level. It's light and compact, about 2-1/2 in length overall.
    [ Hits: 56 | Votes: 0 | Rating: 0 ]
Technical Reference : QRP Projects
  • JBOT QRP linear amplifier - JBOT stands for Just a Bunch of Transistors. It is a simple, stable and easy to build 5 watts linear amplifier build out of a bunch of ordinary low power NPN transistors.
    [ Hits: 81 | Votes: 0 | Rating: 0 ]
  • TxTopper QRP Amplifier - TX Topper 5 Watt plus Amplifier with Adjustable Gate Bias
    [ Hits: 61 | Votes: 0 | Rating: 0 ]

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