Uploaded September 2021 | Updated September 2026, 2 weeks ago

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This second video in the series shows the build, tuning and testing of my 40m multi-band off-centre fed dipole using the 4:1 transformer and 1:1 choke/balun that I built in the first video youtu.be/aYLseBPbxng

For the design of the transformer and balun used in this antenna, my thanks go to Peter aka TRX Lab on YouTube. His comprehensive explanation of the build and testing of both the transformer and balun in a professional lab can be found in part 3 of an excellent series of videos - Part 3: youtu.be/P7wW4TtXmc8 (I recommend you watch all three parts!). Peter's tests also show typically greater than -30dB rejection of common mode currents across the HF bands.

Part 1 of this series can be seen at: youtu.be/aYLseBPbxng

This is one of many amateur/ham radio related videos on my channel. Please feel free to browse 👀, like 👍🏻 and subscribe 🔔, remembering to hit the bell so you’re notified of new videos as soon as they're published and you don't miss out.

0:00 Introduction
1:22 Antenna Build
3:36 Antenna Testing & Tuning
10:46 SWR Comparisons
12:39 On-Air Contacts

Thanks.

Ian.