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DTSTART;TZID=America/Toronto:20260531T130000
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DTSTAMP:20260605T095248
CREATED:20260331T233745Z
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UID:8914-1780232400-1780246800@oarc.net
SUMMARY:REGISTRATION NOW CLOSED End-Fed Half Wave Antenna Build Workshop
DESCRIPTION:*** REGISTRATION IS NOW CLOSED *** \nThe End-Fed Half Wave (EFHW) Antenna Build Workshop will be of interest to anyone who has a multi-band HF amateur radio with up to 100 Watts of transmitting power.  Assemble a 49:1 Un-Un transformer in mounting hardware with a SO-239 feedline connector\, and optionally connect an antenna wire suitable for 80/40/30/20/17/15/12/10m or 20/17/15/12/10m bands.   \nDate: 31 May 2026\nTime: 13:00-17:00\nCost:  Non-members pay $10 more  *** REGISTRATION IS NOW CLOSED ***\n[] $75 – EFHW Antenna workshop with Un-Un transformer only\, no antenna wire\n[] $85 – EFHW Antenna workshop with Un-Un transformer AND 34’ antenna wire (20/17/15/12/10m bands\, suitable for portable use)\n[] $120 – EFHW Antenna workshop with Un-Un transformer AND 132’ antenna wire (80m band\, also resonant on 40/30/20/17/15/12/10m\, suitable for permanent installation)   \nLocation: Scouts HQ (1345 Baseline Rd Ottawa\, ON K2C 0A7\, Canada)  \n  \nWORKSHOP OUTLINE \n1. Introduction\nDefinition and Purpose: An End-Fed Half-Wave (EFHW) antenna is a popular resonant wire antenna designed to be one half-wavelength long at its lowest operating frequency. Unlike a center-fed dipole\, it is fed at the end\, providing high installation convenience\, and it naturally resonates on both odd and even harmonics of that base frequency.\nBasic Components: 49:1 Un-Un transformer\, feedlineconnector\, mounting hardware\, antenna wire   \n2. Design and Construction (overview of tools\, materials and techniques)\nMaterials Supplied: 2 x 240-43 torroids; 100 pF capacitor; 14-gauge enameled wire; PVC junction box; cable ties; SO-239 and misc. hardware.\nConstruction Techniques: PVC junction box will be pre-drilled  \n3. Hands-On Building Session (assembly and troubleshooting)\nPractical Assembly: Participants build their own 49:1 Un-Un transformer in PVC junction box under supervision\, applying the techniques learned.\nTroubleshooting: Guidance on common issues that may arise during construction and how to resolve them.   \n4. Testing and Tuning (performance testing\, tuning techniques)\nPerformance Testing: Instructions on how to test the Un-Un and antenna’s performance using SWR meters and other tools.\nTuning Techniques: Methods for adjusting the antenna for optimal performance\, including compensation coil\, coax counterpoise\, middle-of-wire capacitor   \n5. Conclusion and Q&A (wrap up and open discussion)\nWrap-Up: Summary of key points covered in the workshop.\nOpen Forum: Opportunity for participants to ask questions and share experiences related to EFHW antennas. 
URL:https://oarc.net/activity/oarc-end-fed-half-wave-antenna-build-workshop/
LOCATION:Scouts Canada National Office\, 1345 Baseline Road\, Ottawa\, Ontario\, K2C 0A7\, Canada
CATEGORIES:Education,Workshop
ORGANIZER;CN="Ottawa Amateur Radio Club":MAILTO:contact@oarc.net
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