Introduce to JP1HUJ AI7HU
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Koji Oyama attended Hamvention 2019 in Dayton, Ohio. He saw various antenna products including the Alexloop by PY1AHD and LOOP series antennas by I3VHF. At the flea market, he found some vintage air variable capacitors. The Elecraft K4 was a popular topic of discussion. In 2017, Oyama built a multi-band loop antenna (MLA) for 40m and 30m bands while living in San Jose, California, and used it to make successful JT-65 QSOs between Japan and California.
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Introduce to JP1HUJ AI7HU
- 1. Introduce to JP1HUJ AI7HU ~Hamvention report and My MLA history~ May 25th, 2019 Koji Oyama, JP1HUJ AI7HU email: jp1huj@jarl.com twitter: @Koji_Oyama Facebook: https://www.facebook.com/koji.oyama.77/ QRZ.com: http://www.qrz.com/db/JP1HUJ FlexRadio Facebook User Group in Japan https://www.facebook.com/groups/flexradio.ja/ © 2019 Koji Oyama @Southern California MLA team meeting
- 2. Agenda 1. Introduction 2. Hamvention 2019 3. MLA I made in San Jose, CA in 2017 © 2019 Koji Oyama
- 3. Introduction ◼ Name: Koji Oyama Callsigns: JP1HUJ, AI7HU ◼ Ham Background ◼ 1969 Born in Ibaraki, 40ml northeast of Tokyo ◼ 1980 Interested in radio and electronics @5th grade ◼ 1982 Got 4th-class license and opened JP1HUJ @7th grade ◼ 1988 Moved to Tokyo to enter university → QRT ◼ 1994 Studied industrial engineering and computer science → NEC ◼ 2003 Changed companies: network startup → semicon distributor ◼ 2009 Back to Ham world (CW, HF, DX) → Got 3rd,2nd,1st class license ◼ 2012 Got FCC license KF7QCZ (General) → AI7HU (Extra) ◼ 2014 Interested in SDR and bought FLEX-6300 ◼ 2016 Started FlexRadio user group in Japan ◼ Aug: Joined MLA48 → Showcased FLEX-6300 + MK-7 @Hamfair 2016 ◼ 2017 Established my company Xcelux Design ◼ Jan - Aug: Worked @San Jose, CA → Back and forth btw US and Japan © 2019 Koji Oyama
- 4. HAMVENTION 2019 © 2019 Koji Oyama
- 5. Hamvention 2019 © 2019 Koji Oyama Dayton Chicago 1hour 300ml Hamvention @XeniaAirbnb Dayton Airport 25min 16ml Downtown Dayton 20min 15ml Greene County Fairgrounds & Expo Center @Xenia
- 6. Hamvention 2019 ◼ Presentation @VSF meeting, Arlington VA ◼ http://vsf.tv/events_archive/2019-05_MtgSeries-ArlingtonVA.shtml ◼ Drove from DC to Dayton © 2019 Koji Oyama
- 7. Alexloop by PY1AHD ◼ http://www.alexloop.com/ ◼ Alexloop Premier : LED to know max currency of main loop © 2019 Koji Oyama
- 8. LOOP Series Antennas by I3VHF © 2019 Koji Oyama https://youtu.be/6IuBx9TW8IE https://youtu.be/ICNsFA7uOo8
- 9. MFJ ◼ No update https://www.mfjenterprises.com/Product.php?productid=MFJ-1786 MFJ Hi-Q Antenna © 2019 Koji Oyama
- 10. Flea Market: Air Variable Caps © 2019 Koji Oyama Ray, KF0AF $10 $10 $15 32 – 100pF 25 – 83pF 100 – 205pF
- 11. No.1 topic in Hamvention 19 ◼ Elecraft K4 © 2019 Koji Oyama Wayne Burdick N6KR Co-Founder Eric Swartz WA6HHQ Co-Founder
- 12. Ham networking © 2019 Koji Oyama
- 13. Hamvention lunch © 2019 Koji Oyama
- 14. MAKING MY MLA @CA IN 2017 © 2019 Koji Oyama
- 15. MLA for 40m/30m bands ◼ https://www.qrz.com/db/ai7hu © 2019 Koji Oyama
- 16. MLA for 40m/30m bands © 2019 Koji Oyama
- 17. MLA for 40m/30m bands © 2019 Koji Oyama https://youtu.be/Idj7d3q0b-o https://youtu.be/j_lez9bYn1M
- 18. JT-65 QSOs ◼ Made QSOs btw Japan and CA by my hand-craft MLA ◼ Propagated more than I thought © 2019 Koji Oyama 30m JT-65 (2017.6.19) 40m JT-65 (2017.6.22)
- 19. Technology is the only way to make things simpler Thank you ! © 2019 Koji Oyama