#387 скачать в хорошем качестве

#387

This video shows how to build traps for a 40/30/20m EFHW antenna using a nice kit from N7KOM. We start with the intro into why I am doing this, how to wind the toroids, then how to setup and test the resonant frequency of the trap. Methods for adjusting the toroidal inductor are shown in order to move the resonant frequency to the desired point. An antenna analyzer like a RigExpert is used to test for resonance. I also how how a Dip Meter and Frequency Counter can be used to check the resonant frequency as well. Links for the inspiration (VE6LK video) as well as the trap kit (N7KOM) and my toroid winding tutorial video are all show below the table of contents: 00:00 - Introduction, and reason for doing this 01:17 - The N7KOM trap kit 02:00 - Winding the toroids 03:14 - Soldering the capacitor to the PCB 03:50 - Heat strip toroid wire for testing 04:35 - Tack toroid to capacitor for tuning 04:47 - Setup and theory of tuning the trap 06:24 - Tuning process - trial and error 08:02 - Ready for assembly to PCB 08:26 - Completed PCB for re-tune / check 08:57 - Heat Shrink and re-touch-up tuning 09:33 - Dip Meter for testing resonance 10:33 - Wrap-up Links: Vince VE6LK video:    • Discover the secret ingredients to bu...   N7KIM trap kit: https://www.etsy.com/listing/15952575... W2AEW "how to wind a toroid" video:    • #151: How to wind a toroid inductor |...   Part II: Building and tuning the antenna!    • #388: Build, tune and test a trapped ...