watt

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watt

175 links - and 1 categories

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: 187 | 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: 104 | 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: 103 | Votes: 1 | Rating: 8 ]
Manufacturers : QRP Kits Manufacturers : SWR Meters
  • DJ9PK SWR Meters - This device was designed as an SWR and power meter for Radio Amateurs. In addition to SWR, it measures forward and backwards power, therefore can also be used as a wattmeter. With a large measuring range from 1 to 1000 watts, it is suitable for use from QRP to QRO
    [ Hits: 205 | Votes: 0 | Rating: 0 ]
Operating Modes : QRP
  • QRP is for Beginners - QRP is a Q-code originally meaning reduce power, but now has come to mean operating a radio that outputs 5 watts or less for CW or 10 watts for SSB.
    [ Hits: 117 | Votes: 2 | Rating: 9.5 ]
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 : Alternative Power
  • Reliable Emergency Power: Solar Solutions - In a quest for reliable emergency power, the article discusses the necessity of accessible power solutions amidst blackouts and energy crises. It introduces the American-made Merlin Panther 100-watt solar briefcase and budget-friendly LiFePO4 batteries. The setup addresses the need for modular, renewable power solutions, balancing cost-effectiveness with functionality for various scenarios. The narrative emphasizes the importance of reliable power sources in unpredictable situations.
    [ Hits: 48 | 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: 65 | 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 : HF Radios
  • BITX QRP RTX - An easy to build 6 watts SSB transceiver for 14MHz. BITX is an easily assembled transceiver for the beginner with very clean performance. Using ordinary electronic components and improvising where specific components like toroids are not available, It has a minimum number of coils to be wound.
    [ Hits: 103 | Votes: 0 | Rating: 0 ]
Technical Reference : LoRa and LoRaWan
  • A Comparative Study of APRS Tracks with 1W and 100mW LoRa Trackers - Exploring LoRaWAN Range, comparing the performance of 1Watt and 100mW LoRa trackers on daily commute. Analyzing APRS tracks, beacon statistics, and visual comparisons to uncover insights and surprises in the world of long-range wireless communication.
    [ Hits: 46 | 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: 83 | Votes: 0 | Rating: 0 ]
  • TxTopper QRP Amplifier - TX Topper 5 Watt plus Amplifier with Adjustable Gate Bias
    [ Hits: 67 | Votes: 0 | Rating: 0 ]
Technical Reference : SWR Meters

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