The Home Page of The Amateur Radio Station W6SI

Link to MLA48 Project
(Caution: Japanese Language)

 NCDXF BeaconNCDXC Beacon
Beacon Chart Now Online!

Join SOARA! 

QST!! IARU/NCDXF DX Beacon Chart
for South Orange County area is available On Line!
See what DX you should be hearing in Mission Viejo neighborhood
Click Here to Access

"Introduction to MLA - The Basics"Booklet
English Edition by MLA-48 Project
Click here to download

"Magnetic Loop Antenna" NEW Chapter 5 is UP
Click Here to Access Chap 5 (use link below to get to Chap 1)

Hello! Thank you for visiting my site.
This is W6Si (Tak Asami), a.k.a. JE1VMO
Mission Viejo, CA USA

operating at this QTH since Nov 25, 1997

W6Si is a ham radio station with its primary objective set for
Development, Study and Practice of

  • HF DX Communications
  • Communication Technology Development, in particular,
    - SDR
    - Digital modes
    - Antenna innovations
  • Sharing of knowledge & experience through networking with fellow Hams
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  W6SI's Technical & Not-so-Technical BLOG: (Index of Blog Entries)  


Recent Entries:  
  5/23/2017: Impedance Transformer for Multiband Antenna
An impedance transformer, otherwise known as 1:n balun / unun. As you know, balun is a coupling network between balanced (such as dipole antenna)...
  5/1/2017: HF J-Pole Antenna (or NOT!)
Despite the long history and popularity of this antenna, there seem to be a lot of confusion about what this is and how it works...
  4/11/2017: V/UHF Dual Band J-Pole Antenna
Back in June 2015, I think, I wrote about an odd-ball J-Pole antenna I was using for 2m and 440 at the base station here. It had an odd arrangement for...
  10/20/15: New Receiver Architecture Part 2
The secret of K3S and what's the big deal about its frequency synthesizer
  ... more (please see "Index of Blog Entries" for the full list)  
  PROJECTS: << Advertisement
  "Magnetic Loop Antenna" Series now in Chapter 5!!
You heard so much about this mysterious small loop antenna that works on all HF bands. A small size. Are they for real? How can that be?
Update (4/10/2018) "5. Automating Magnetic Loop Antenna (Part 2)"
Space Available >>
  "Mission Viejo Special Mark 2 Antenna" Coming Soon!  

"Mission Viejo Special" Antenna
A Mutiband antenna for DX operation in a deed restricted land...

THE NEW UPDATE is COMING for the Mark II antenna!!
Update (3/9/2015) "On The Air" page.


Low Cost SDR HF Receiver
Want a (very) low cost, competent HF/VHF/UHF all mode receiver? Here's how.

  LiFePO4 Battery Packs (Coming Soon)  
  Phased Array Antennas (Coming Soon)  
  NCDXF Beacon Tracking (Updated Daily)  
  Metrric System & Metric Calculators (Coming Soon)  
  Azymuthal Map centered at Mission Viejo, CA  
  My Favorite Links  
  W6Si Photo Gallery  
  SOARA Field Day, 2019 (Jun 21-23, 2019)  

SOARA Field Day, 2018 (Jun 22-24, 2018)
VIDEO: Raising 20 Meter Beam Antenna (Jun 22, 2018)

  SOARA Field Day, 2017 (Jun 23-25, 2017)  
  SOARA Field Day, Jun 24-26, 2016  
  SOARA Field Day, June 26-28, 2015  
  SOARA Fair, Aug 18, 2014 etc.  
  SOARA Field Day, June 28, 2014  

SOARA Field Day, June 22, 2013

  SOARA Field Day, June 23, 2012  
  SOARA Field Day, June 24, 2006  
  Feedback? Opinions? Please e-mail me.
  Copyright 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Tak Asami / W6Si & OSO Technology