K6ARK took tiny and made it big, but still portable!
I was honored to receive a sample of a Version 2 concept Adam is working on.
A 50 Page Document on EFHW antennas (7 band) written by Stephan M. Schmid, HB9EAJ. – https://hb9sota.ch/wp-content/uploads/2021/07/Portable-7-Band-EFHW_HB9EAJ-V1.0.pdf
Owen Duffy’s Calculator for saturation current in a Toroidal Inductor – https://owenduffy.net/calc/isat.htm (lot of good information on his main site)
WQ9F Ham Radio – https://www.youtube.com/channel/UCavIwillD9A4Y-8N4dT0zrw
Is this product available, where can you get it, does it really do 100W?
My observations about the ease of the build are the same: This build is EASY and uses the same concepts as his other EFHW kits available at Amazon.com – https://amzn.to/39NmUbS (All links provided through Amazon.com are affiliate links)
For this build, I used a T140-43 torroid But in the video, I will discuss Stacking T140-43’s for more power (Tim The Toolman Taylor Grunt): https://amzn.to/3OmcQFF (7.99) or https://www.jpmsupply.com/Toroid-Core-FT140-43-Ferrite-p/38023.htm (2.69 plus shipping) or
JPM on ebay – https://www.ebay.com/itm/Toroid-Core-FT140-43-Ferrite-/112045422398 (2.89 plus 4.70 shipping)
and a 3KV 100PF SMD capacitor or a regular 1KV-3KV capacitor will work if you do not want to fuss with SMD – .
Cool Banana Plugs shown in the video – https://amzn.to/3OqXznm
The antenna wire used was BNTECH GO 26AWG . I used around 65 feet for my EFHW.- https://amzn.to/3QHrYzb
Finally, the magnet wire I used was BNTECH GO 20AWG – https://amzn.to/3xLIxkY
What do you think of this potential product by K6ARK?
I spoke with Adam after testing: he mentioned the possibility of adding a compensation coil:
“”Get it resonant on 40m with extra wire folded back on itself, then check 20, 15, 10. If 20, 15 and 10 are above the bands, a coil at about 6ft from the feed point will help. 10-12 turns on a 3/4 inch form (I use black plastic drip tubing in my kits). You’ll have to lengthen the wire slightly to get it back into resonance on 40m, but then 20, 15, and 10 should have the dip right in the bands”
This was a fun kit to build and I will be excited to see where K6ARK takes this.
#hamradio #efhw #antenna