5 watt to 7 watt

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5 watt to 7 watt

12 links

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
  • Semi-automatic antenna tuner project - Thsi article describes a microcontroller driven semi-automatic antenna tuner capable of handling power levels up to 150 watts. The device is a low pass filter tuner manually tuned by setting the optimized L/C combination by hand and then storing the values into the EEPROM of the mictrocontroller to recall them later (seperately for each band from 80 to 10 meters including WARC bands)
    [ Hits: 291 | Votes: 0 | Rating: 0 ]
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 ]
Shortwave Radio : Broadcasters
  • WBCQ The Planet - This summer, WBCQ is running The Voice of the M/S Katie, live radio broadcasts originating from our radio ship the M/S Katie in Boston, Massachusetts. WBCQ broadcasts 50,000 watts on each of its four international shortwave transmitters on 5.110, 7.415, 9.330 and 18.910 MHz
    [ Hits: 860 | Votes: 2 | Rating: 10 ]
Technical Reference : Amplifiers : HF Amplifiers
  • Dentron DTR-2000L restoration - The Dentron DTR2000L is an HF amplifier from the 1980 era. It uses a single 8877/3CX1500A7 tube to produce about a kilowatt of RF output. In this page NR7N includes info on operation, restoration and mods.
    [ Hits: 703 | Votes: 4 | Rating: 9.75 ]
  • Stone Creek Special 600 HF RF Amplifier - This is a Solid State Amplifier Project. It uses 4 MRF150 MosFet Power Transistors. The Power Supply Voltage is 50 VDC at 21.5 Amp. The max power available is 1,075 Watts. The Efficiency is about 65% +/- and runs Class AB Solid State.
    [ Hits: 270 | Votes: 0 | Rating: 0 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • 2 m. Band VHF PA 5 Watts - A VHF power amplifier made with two cheap RF transistors, 2N3924 as driver and a BFS22A for final stage, giving an unexpected output power of 7-8 watts maximum
    [ Hits: 1984 | Votes: 1 | Rating: 10 ]
Technical Reference : Beacon keyers
  • N7KSB Milliwatt transmitter - N7KSB used this 1/2 watt CW transmitter, with a roof-mounted ground-plane antenna to work all continents and over 30 countries
    [ Hits: 3005 | Votes: 4 | Rating: 6 ]
Technical Reference : Dummy Loads
  • 5400 W Dummy Load - High Voltage Dummy Load 3000 OHMS, 5400 WATTS There are 45 layers of 6 resistors, each one being 400 OHMS @ 20 Watts for a total of 270 resistors
    [ Hits: 1370 | Votes: 6 | Rating: 8.17 ]
Technical Reference : Homebrew
  • Experimental HF 6-band SSB transceiver - An SSB radio for the HF bands will be presented. Featuring 12 to 20 Watts of output power (depending on DC supply), full DDS frequency generation, covering 6 major frequency bands (1.8, 3.5, 7, 14, 21 and 28 MHz) within the short wave amateur radio spectrum. The rig also features colored LCD and front panel backlight.
    [ Hits: 709 | Votes: 14 | Rating: 9.86 ]
Technical Reference : Radio Direction Finding
  • The Fox - 750 mw transmitter - This RDF three transistor 144 MHz transmitter uses a 48 MHz scanner crystal as an oscillator / tripler. A second transistor boosts the signal to 40 milliwatts, a third amplifies the power output to 750 milliwatts. Includes schematic and pictures.
    [ Hits: 423 | Votes: 2 | Rating: 5.5 ]
Technical Reference : Transverters
  • 70 MHz Tansverter - Pictures and design plan of a 28 MHz - 70 MHz transverter 3Watts in - 8Watts out by 9A2SB
    [ Hits: 718 | Votes: 1 | Rating: 1 ]

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