turns ratio
5 links
- 6 Meter Quad Turnstile Antenna
- A quad turnstile consists of two cubical quad loops oriented in a diamond configuration and angled 90 degrees apart from one another with both diamonds sharing the same top and bottom points
[ Hits: 369 | Votes: 1 | Rating: 10 ]
- DIY isolation transformers
- Article about isolation transformer construction to perform optimal impedance matching. Winding the FCP isolation transformer, includes interesting table for Winding Turns and Lengths and Core Configurations for T300 T200 T400 toroids
[ Hits: 317 | Votes: 0 | Rating: 0 ]
- End-Fed HalfWave Matching Unit for SOTA operations
- An end-fed half wave antenna matching unit made of 3:24 turns ratio on a FT140-43 toroid with a 150pF capacitor across the input.
[ Hits: 259 | Votes: 0 | Rating: 0 ]
- The End-Fed Half-Wave Antenna - Presentation
- A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.
[ Hits: 406 | Votes: 3 | Rating: 8.67 ]
- Dual-Band X-Frame Shortwave RX Loop Antenna
- A dual band X-frame wire antenna made using 4 turns for response down to 3 MHz or so, and 2 turns (switched) for response up to around 18 MHz. The loop configurations are tuned using common eBay 365 pF tuning caps.
[ Hits: 148 | Votes: 1 | Rating: 10 ]
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