My 80-10 EFHW antenna also resonants on 630 meters with about 1.6:1 SWR. Since no tuner is required, it makes a decent compromise antenna. My WSPR beacons are heard as far away as 950 miles. I'd like to see another video on this very subject. - Jim WA2UMP
I was out in my garden (yard) yesterday and I can just about squeeze in a half wave for 30m. Having room for a half wave on 160m is a dream so lots of aerial envy here Kevin. Good work and keep trying the transmitter.
As we say in the UK "That's a turn up for the books"! Thanks for sharing this, it would never have crossed my mind. I'm fortunate in that my plot is 460ft, so I may well try and EFHW on 160.
Great video exploring the end fed 160m 1/2 wave and it's utility. The trial on 630m shows that at least on the antenna side there are potential reasonable antenna options for those of us without huge towers or large plots of land. Thanks de VA3NIE
Congratulations that was an awesome video you did. And also to hear a QSO on 630m. I really do enjoy your videos. I hope you’re doing well and stay safe 73 WD5ENH Steve
Wow 200 feet and in any direction. that is acre of camp site !! now that would be interesting for a spiderweb array off a rigid vertical at about fourty feet up with sling to lift the lot up.. (heck of a tripod or drive on ) got my design pad out..may make it and send.. nice set up Kevin..
Thank you for this. I was just told that it could not be done and with a 49:1 using 131 feet of wire it was basically a short. Seems odd I could add to the 10-40 to reach 80 but that is is not suppose to work on 160. Was told to just use the wire. What? Would love you thoughts on this .
Interesting, I made 1x49 un-un for a EFHW-4010. I also by-pass the un-un to get on 80m. I'm run new swr scans at lower frequencies to see how it looks. Maybe, some hope for 160m. By passing your 160m would put it right in the AM broadcast band. Too bad there is no amateur frequencies there, but you would likely get great AM radio reception.
Thanks Kevin for the great video. I was wondering how well you antenna works on 14 MHz and higher as I plan to put up a cheap antenna for now. I have been off the air for over 10 years but at least I have no space restrictions as I moved to a house with a large property. I could easily put up a half wave for 630 meters as I have 57 acres in NE Florida and plenty of tall pine trees to use as masts. I have long had plans to build a 630 meter transceiver and I finally have the time do do so. Thanks again for the great video, Dave. N2SN/4
I think the standard winding would work, but you need to have core material that works down at those frequencies. But this is just a guess. A half wave wire at 474 kHz would be about 988 ft.
You are limiting yourself with the UNUN. I would never attempt this kind of experiment without a multi-tap UNUNs I've been testing. Heck, the last post I did is of a wire laying on my deck 12" high. I got a match of 1.0:1, R=51, X=0 using the 64:1 tap. Usually I use the 81:1 tap. No need for the internal tuner, ever. And I make contacts. even with the 'SAD-40' which is the speaker wire on the deck. lol. 73
There's several with a simple google search. Here's one. Just cut the wire length to a half wave on whatever band you're targeting. www.infotechcomms.net/downloads/Multi_band_EFHW_spool.pdf
One more question - is enameled wire required for the transformer? I have tons of normal 14 gauge solid core wire laying around. I know some of your other projects use 18 gauge wire that is not enameled
@@brianherman2482 Any sort of wire will do, as long as it's insulated from the core and heavy enough to handle the power you're running. That 14 should be fine and you should be good for 100W radios.
200ft is 60.9mtrs or near enough. If you try long enough someone will hear you, but noise and low power during the day do not go well. New Zealand on 1/4 of a watt, wow, now if that had been SSB it would be double amazing. Congratulations on getting there, that shows what can be done with little power.
