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Antennas : Baluns- UniBalun: Lightweight Balun/UnUn PCB for QRP Radios (1:1, 1:4, 1:49)
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- The UniBalun is a PCB for building a lightweight antenna transformer (Balun) or impedance converter (UnUn) for low power radios. By soldering jumpers and a toroid core, you can create a 1:1, 1:4 Balun or 1:49, 1:9 UnUn. The latest revision (1.2) includes improved pads and supports both BNC and SMA connectors. Build instructions are available for German speakers.
[ Hits: 37 | Votes: 0 | Rating: 0 ]
- Some secrets of Common Mode Chokes revealed
- This is a small collection of K9YC info and my experiences. Problems by feed lines of 1/2 lambda length. CMCs in transmitting and receiving systems. Antenna unbalance, Maximal allowed power, Choke winding tips.
[ Hits: 174 | Votes: 1 | Rating: 10 ]
- Antennas for QRP Operation
- Antennas for low-power operation resemble those for 100W use. Minor adjustments, like capacitor voltage ratings, may apply, but basic principles persist. Portable antennas, notably Backpack Antennas for weight-conscious setups, hold relevance beyond QRP. While some antennas function acceptably at higher power, efficiency issues arise at QRP levels. Testing antennas at 100W exposes weaknesses, particularly in tuners, crucial for efficient QRP operation.
[ Hits: 58 | Votes: 0 | Rating: 0 ]
- 40 MHz 8m Band Amateur Radio Exploration
- The 8m ISM band, a unique frequency range between 10m and 6m, holds potential for amateur radio enthusiasts, yet it remains largely unallocated. This spectrum offers fertile ground for research and self-training. The author's experience with low-power transmissions and WSPR testing highlights the band's capabilities and the need for a narrow, speech-free amateur allocation to encourage experimentation. Discover the world of 8m ISM radio exploration and its future possibilities.
[ Hits: 72 | Votes: 1 | Rating: 8 ]
- FT-817 internal battery power Fix
- If your FT-817 has stopped powering up from the internal battery but works from external power, then maybe the internal battery fuse has blown.
There is a small PCB mounted fuse to protect the battery and radio. This fuse can blow, if it does your radio will not work from battery power.
This page will describe how to test the fuse and describe how to make a repair.
[ Hits: 52 | Votes: 0 | Rating: 0 ]
- A600 Power Amplifier Project
- This is a power amplifier project for a RF 600W 1.8 MHz to 70 MHz linear amplifier including a Low Pass Filter. Projects includes schematics, pictures, PCD design, fans details, note on PA ferrite chokes and assembling instructions
[ Hits: 100 | Votes: 0 | Rating: 0 ]
- 50 MHz 300W Power Amplifier
- This project addresses the need for a 50 MHz Amplifier providing substantial power for Australian "Advanced Licensees" permitted to use 400W PEP in the 52-54 MHz band. In regions limited to 100W PEP due to TV channel usage, this initiative aims to enhance power output for transceivers with lower capabilities on the 6m band.
[ Hits: 64 | Votes: 0 | Rating: 0 ]
- USB-C charging for Handheld Radio Transceivers
- The article highlights the common absence of modern USB-C ports on handheld ham radios and the limited use of USB for power. The author, [jephthai], shares a solution involving a USB-C cable with power negotiation capabilities, allowing the radio to be powered by USB. By splicing Anderson power pole connectors onto the cable, the radio can now be conveniently powered by a USB battery bank, providing a practical alternative to traditional 12 V batteries for off-grid operations.
[ Hits: 141 | Votes: 1 | Rating: 10 ]
- LoRa in Amateur Radio
- About LoRa, wireless communication technology designed to transmit data over long distances. LoRa provides a means for wireless data transmission over long distances with low power consumption. Practical applications of LoRa in amateur radio
[ Hits: 98 | Votes: 0 | Rating: 0 ]
- 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 ]
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