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- Опубликовано: 25 дек 2021
- Today's video features the ARRL EFHW Antenna Kit by HFKits.com, which is essentially a nice, weatherized 49:1 UNUN Transformer to convert the 2500-3000 ohm end-fed halfwave feedpoint impedance down to approximately 50 ohms. I review how to build/assemble the unit, and run a quick bench test.
The kit is available from the ARRL as well as HFKits. Here are a few links:
ARRL:
Sale page:
www.arrl.org/shop/End-Fed-Half...
Instructions:
www.arrl.org/end-fed-half-wave...
HFKits.com pages:
www.hfkits.com/build-instruct...
www.hfkits.com/product/end-fe...
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Bravo! Short video packed with relevant information without a bunch of nervous “uhs” and “ums”!
My kit just came today. It will be my first build as a ham. Thanks for the clear instructions. 👍👍
That is a well designed kit. Even the mounting bracket for the core was thought out. I just checked their web page and they really have a lot of good information on their page. Great video, thanks for posting.
Nice video. I just happened to look at the ARRL kit this morning and then I saw your video after watching something totally unrelated. Very nicely done, and for the price it would make a great second (or portable) antenna.
I built one in the summer of 2021 and it works real good. Made good contacts using QRP 5 watts
Very nice! Happy Holidays, Alan. 73
Nice video, clear instructions and enjoyable ! 👍👏
Great video! I bought one of these kits a while back because where we live we don't have room for a proper antenna. The kit has yet to be built since I had some questions about winding the toroid. Watching you wind the xfmr cleared them up. Thanks. de N1ABE 73>>
Well done Alan! Happy Holidays :-)
Great how to video! Have a great New Year!!!!
Thanks for sharing. Not my area of interest, or expertise, but it is always fun to watch a build. Tip = You can g-r-e-a-t-l-y strengthen the anchor bolt point by just adding a backer plate. A large flat fender washer can work. Add a little epoxy under it. HTH.
Looks good! Now we'll wait for real usage of this UnUn for an EFHW.
Thanks for another great video. And thanks for sweeping all the bands as it answered a question I have. I had wanted to get this and add more wire so I could get down to the 160M range. Your scan show that provably would not have worked well. I suspect a counter poise may be able to change that but probably not. Thanks again de ki7cea 73
I bought already two kits from them, impressed with quality vs price. Also they sell a nice quality wire for making wire antennas, with teflon inside, very good for long wire antenna. Thumbs up for them.
Hi Alan,
Looks like fun. I'd like to see an on air performance test in a future video. Thanks and 73's!
Hi Alan very nice work as usual,next step is on the air,tls for posting ...stay safe 73 Dinos
Hi Alan - I just assembled this same kit from HF Kits. After completing the assembly I took another look at the orientation of the SO239 connector. I’m relieved to see that I installed the connector the same way you did with the square plate on the exterior of the box, which is opposite of what’s shown in the instructions. Having the plate on the interior seems to invite water penetration. I’m now building a choke kit from HF Kits and find the same issue. I’m going to go with my intuition and install the plates on the exterior. - Cheers - Jim (KK7CSC)
Beautifully built.... 💯🎸🙋♂
Great video. Here in NE Florida I use an end fed half wave antenna cut for 80 meters configured as an inverted L. My home made 49:1 UNUN almost identical to the one in the video except I use two toroids glued together. It works from the low end of 80 to the top of the 10 meter band with an SWR low enough for my Icom 7300 to tune with it's internal tuner. Without the tuner the SWR is about 1.6 : 1 on 80 and 40 and about 1.9 : 1 on 20.