HF Antenna Micro-Traps - DIY Build Project скачать в хорошем качестве

HF Antenna Micro-Traps - DIY Build Project

This is the one you've been waiting for - the traps to go with the micro End Fed Halfwave (EFHW) antenna build. Here's how to make them. These traps will work with my Ultimate Ultralight EFHW (   • Ultimate UL Portable Resonant Antenna...  ) or just about any QRP end-fed halfwave antenna, and you could even build pairs to use with a dipole. LINKS: LC Resonance Calculator: https://www.omnicalculator.com/physic... Toroid Winding Calculator: http://www.66pacific.com/calculators/... You'll certainly need some MATERIALS: T37-2 Toroids (my usual): https://amzn.to/3hFsYlj T50-2 Toroids (a little more efficient and maybe easier to build): https://amzn.to/2QCkGio 28 ga Magnet Wire: https://amzn.to/3b9Isf4 39pF 100v Ceramic Capacitor (0603 case recommended): https://www.digikey.com/product-detai... NOTE: 100v is marginal for 5w. Consider a 500v or 1kv for better durability and/or higher power. 500v: https://www.digikey.com/product-detai... 62pF 100v Ceramic Capacitor (0603 case recommended): https://www.digikey.com/product-detai... NOTE: Again, 500v model is needed for 10 or 15w. https://www.digikey.com/product-detai... Also, consider a few other capacitors in the 22pF - 100pF range, depending on the traps you'd like to build. Perforated Prototype Board: https://amzn.to/35lcvzn 5/8" Heat Shrink Tubing: https://amzn.to/3lwwGjt 1/4" Heat Shrink Tubing: https://amzn.to/2G9bGzk And you'll need some TOOLS: Dremel (or similar)high-speed rotary tool: https://amzn.to/3gFEkEL NOTE: I have had my Dremel tool for about 25 years now and it hasn't missed a beat. Based on my personal experience, I would recommend going with the name brand tool. Diamond Cutting Wheels: https://amzn.to/2QBRHve NOTE: I really like these because you can't cut yourself with them, but they cut the perf board and BNC connector brass just fine. Soldering Iron (any will do) with a fine tip: https://amzn.to/2GaENlN NOTE: I've been using this one for about a year with no issues. The heat gun is AWESOME for hot air/solder paste construction. The iron works well for traditional soldering. Electronics Tweezer Set: https://amzn.to/2ENy00w Please share your builds with me when you're done, and tell us about how it works out for you in the comments below. Thanks! de K6ARK