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
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 .
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..
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.
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
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.
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.
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
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.
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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
Good job Kevin. Keep experimenting. I am inop at present for putting up large/long antennae (shutdown). Look forward to subsequent findings
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
You don't know if you don't try. Good stuff Kevin, good stuff.
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 .
Nice Video Kevin. Very interesting.
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..
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.
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
That’s actually a nice find!
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
You are making me wish I had more real estate to work those lower frequency bands! 😃
Really interesting as I want to use my 300m wire here but I need to build a 49:1 it seems?
I can go a full wavelength on 630m plenty of space here.
49 to one would work for a half wavelength end-Fed wire.
@@loughkbIt seems most you can buy are only for say around 2Mhz upwards…..Are there any builds especially for LW?
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.
How about a full loop for that band? (160) How high up at a minimum would it need to be?
That sideband (usb?) QSO on 630m was really cool. Could the bucket variometer get a few tens of mW on 2200m?
That is an awesome discovery!
I hope your experiments continue to bring you good numbers!
73 DE N2NLQ!
you have a big backyard,,, how about the Rombic that would be an interesting antenna
Very interesting, enjoyed. Thank you.
Very cool
Nice info, which transmitter are you using? I see I can alter my ICOM - 7100 for 660M
My self built cw TX I showed in the video.
I really enjoy your experimentation,keep it up,keep well,regards Colin G1PGI.
That's a pretty nice dip :-) Can you add some inductance and resonate that wire right where you want it?
I have a 160m inverted-L but no balun. Maybe I could keep the L configuration and build a 49:1. Wonder if that will work?
If it's fed from the end I think it should.
Would like to know more about how you're connecting those two radios! Great Vid.
Good job. 73 N5XS
For memory: 100 feet is approx 30 meters.
Do you have a link for the plans for the transformer and antenna build on this?
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
@@loughkb thanks. I’m gonna build a 160 meter halfwave. I appreciate your channel :)
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.
Would a 16:1 UNUN bring the SWR down to 1:1 or 1.5:1
The impedance at that point is already close to 50 ohms.
Very nice. Keep up the videos. They are all fantastic!!! 73!
WB9ZDS/6, Chuck
WOW!!!!!!!!!!! This is awesome! - 73 - KM2W
Just goes to show,,,,,, that unless you try it you will never know. But then that's what our hobby is all about.
Good work Kevin 💪👍.
de2E0LFD Baz
What radio is that you are using that's got 630m?
I built a CW transmitter for 630.
Four part video series starts here:
ruclips.net/video/Knxxeo8-UU8/видео.html
Oh OK, so you were just listening on one and transmitting on another?
@@YZFoFittie Yes.
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
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.
Hi Kevin,whare can i find the size and drowning enfed,tanks....jan 73
Little buttons big fingers lol
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