I use one of these (49:1) and they work great. I have about 250 feet of wire attached to mine so i can sort of work top-band. It must have worked because i spoke to Callum with it at only about 20 foot high on 80m. Highly recommend people giving this system a try.
@markramsay63993 жыл бұрын
Another great video. It does demonstrate the advantages of having the correct tools. Like that little device for removing the enamel...
@americaswayout44893 жыл бұрын
KZbin is repeating all your episodes, it always looks so easy watching you. You get more done by accident than I can with a month's worth of planning.
@M0JHN3 жыл бұрын
Apparently reading on toroids if you doubled or tripled the efficiency goes up a bit. Going to test this one thanks for sharing Mike!
@mike-M0MSN3 жыл бұрын
You are welcome
@garyh83154 жыл бұрын
Great little build. I enjoy watching your soldering skills..... I need to sort that out!!
@mike-M0MSN4 жыл бұрын
Thanks 👍
@OH8STN4 жыл бұрын
Excellent video. The only issue with the DX Commander being deployed portable, is the counterpoise wires. Poles themselves are awesome, but we always end up tripping over the counterpoise wires when it's setup near the camp. I hope Callum takes the endfed seriously. Thanks for sharing this video.
@mike-M0MSN4 жыл бұрын
👍
@OH8STN4 жыл бұрын
@DX Commander Awesome 👍
@ralphwilmot63514 жыл бұрын
EFHW does not need counterpoise wire.
@YZFoFittie3 жыл бұрын
@John Cliff a 50 ohm dummy load has great VSWR...
@AbdulMalik-in3clАй бұрын
Good education. . .Maybe I will try to make one for my radio
@radiotec764 жыл бұрын
Sweet Mike! I built a 49-1 with two Amidon FT240-43 cores. I wound mine counterclockwise like you did but being paranoid I unwound it, wasting that wire and wound it clockwise, as if rf knows the difference, and housed it in an outdoor utility box. So far I've only used it on receive and measured the Rx on receive into a 138 ft piece of wire. At resonance, in the low end of the 40 meter CW band it was at 200 ohms but close to 50 ohms on 20 meters. de WD5L
@mike-M0MSN4 жыл бұрын
left, right, counterclockwise, clockwise it's all bananas. LOL
@jean-emileelectrobricoleur11443 жыл бұрын
merci pour ce beaux .propre .et joli travaille comme d habitude 73 a plus
@ReflectingMe20244 жыл бұрын
Don't really need 64:1 but always enjoy your content Mike, so watched it regardless! I am thinking of making a doublet and therefore may need a 4:1 (I think??!!), and also an EFHW so possibly a 49:1 at some point. Keep up the great work Mike, especially re the hands-on content as it is some of the best I've seen. No messing, no time wasting pre-amble, no bs.... just straight into it. #kudos. John - 2W0JVB 👍
@acestudioscouk-Ace-G0ACE Жыл бұрын
Nicely done as usual Mike. Please can you say what material your eyelet tags are made from. I have aluminium ones, which of course don't solder.
@mike-M0MSN Жыл бұрын
All the tags are Tined Copper from RScom
@Rickg6uzt3 жыл бұрын
Hi Mike. Do you have a part number/suggested retailer for the weatherproof box?
@mike-M0MSN3 жыл бұрын
Ebay
@ManuelPinner Жыл бұрын
These are very good to Use in a HOA because, A wire from the a House to a Tree is not Visible to them to from the Street!
@PrimulaCarniolica4 жыл бұрын
MASTER & masterpiece!! Bravo Mike!👍👌
@mike-M0MSN4 жыл бұрын
Thank you 👍
@benbogg543025 күн бұрын
Do you have to use the coated copper wire, or can you use PTFE coated silver plated stranded wire? I just built a 64:1 using the PTFE wire with dual FT240-43 fair-rites and a 100pf 3KV caap, wondering of I messed up.
@mike-M0MSN5 күн бұрын
any wire will do... just give it a go
@hankhamner36713 жыл бұрын
I love your videos. You probably will do this before it is finally installed but, on my home made transformers, I use two FT-240-31 for a broader frequency and power range and also vent the sides and create a couple of 1/8" weep holes in the bottom covered on the inside with small pieces of plastic screen glued with hot glue.
@mike-M0MSN3 жыл бұрын
Thanks for the tips!
@dback44303 жыл бұрын
Do you have good luck with the type 31's? I use type 52's and am very impressed
@TomG2NV4 жыл бұрын
Smart job Mike! What do you recon it's power handling capabilities would be with 1.8mm wire and the single 240-43 toroid?
@mike-M0MSN4 жыл бұрын
100 to 200 watts
@MountainRaven19602 жыл бұрын
Can anyone point me in the right direction on how to model baluns and ununs using either eznec or similar software?
@antenaseinterfacescb4 жыл бұрын
Nice Job 7351, I was made one 9/1 with a toroide of an old TV. Works fine without ATU 160 meters 80 meters 40 meters not so good on 20 meters not so good on 11 meters but works well from 28 Mhz to 30Mhz. TKS fer sharing. 7351.
@mike-M0MSN4 жыл бұрын
Very cool!
@scharkalvin3 жыл бұрын
I've seen both 64:1 and 49:1 ratios specified for EFHW antennas. Not sure which one works best.
@mike-M0MSN3 жыл бұрын
Much of a muchness one feels.
@ramadaxl3 жыл бұрын
Who else 'blew' on the solder when he put the capacitor in place !
@mike-M0MSN3 жыл бұрын
yep
@markg6jvy1354 жыл бұрын
Nice work Mike 👌👍👏
@mike-M0MSN4 жыл бұрын
Thanks 👍
@RA4FOC3 жыл бұрын
How powerful is this UNUN?
@mike-M0MSN3 жыл бұрын
Up to 400 Watts PEP
@G0ogs2 жыл бұрын
I’m a bit confused with this dx commander Is it the pole or any wire antenna it’s supports ? , if I fixed a slimline made from 300 ribbon to the top of one would that be a 2m dx commander as well😳
@mike-M0MSN2 жыл бұрын
Well, I guess that would be a slim Jim for 2M supported by a DXCommander. In the same way the 64:1 is. I do hope that you are no longer confused 🤔
@JunkyardPhysics3 жыл бұрын
The Dremel ..YES....I'll never use a sandpaper scap again. Well not quite never.
@mike-M0MSN3 жыл бұрын
HaHa
@M0UAW_IO834 жыл бұрын
Nice build, I'm about to make something very similar. Nice n easy to test as well if you have a NanoVNA. One question though, where do you get the boxes from? Everywhere I've tried either doesn't have that type or is out of stock?
@mike-M0MSN4 жыл бұрын
eBay. 👍
@ZL1BQDRoly4 жыл бұрын
Nice job as usual Mike 👍
@mike-M0MSN4 жыл бұрын
Thanks 👍
@BikerBytes4 жыл бұрын
I've made one just like this but I get a short when putting a meter over the SO239, is that expected considering its the same bit of copper wire soldered between the center pin and the ground having had the enamel sanded off? Cheers.
@mike-M0MSN4 жыл бұрын
keep reading the comments have answered this somewhere Thanks 👍
@ohyeawhosurpoppy4 жыл бұрын
Don't forget the choke. Because you added the 10m band with the capacitor here is a suggestion. Using 2ea FT240-61 toroid use RG-58 wrapped 17 pass throughs AND leave a tail on the output side of about 4m-5m with a PL-259 to connect to your new 64:1 auto-trans. Have a bulkhead SO-238 on your container for your main feed coax to connect to. FYI- using this choke you DO NOT need a ground counter poise.
@mike-M0MSN4 жыл бұрын
Thanks for the great tip.. 👍
@jrfoleyjr4 жыл бұрын
43 mix is better than the 31 for HF. Upper hf (12-10-6 meters) and above use the 31 with 1 or 2 less turns per side on the balun. Hmmm did you say whether you are winding a 49 or 64 to 1 coil. How many wraps did you make on the toroid? No weep hole...
@hankhamner36713 жыл бұрын
I have used both and, in my opinion, the 31 mix is preferable to the 43 mix. This is especially true if your intend to run more than 100 watts or have long digital or cw qsos. The Ferrite toroids will not return to their original state if the temperature gets close or exceeds the Curie temperature. The 31 mix has a much higher Curie temperature than the 43 mix. Additionally,, the 31 mix is more linear over rated frequencies than the 43 mix. Check the Fair-Rite or Amidon data sheets.
@dback44303 жыл бұрын
@@hankhamner3671 I thought the 31 was for chokes. Hmm,
@davidniemi40514 жыл бұрын
Sweet little build Mike. The 1.8 mm wire works out to about 13 AWG so call it 14 AVG. Curious what type and value capacitor you are using?
@mike-M0MSN4 жыл бұрын
disc ceramic 100pf 3kv
@backcountryamateurradio3 жыл бұрын
Beautiful.
@YZFoFittie3 жыл бұрын
I think you missed 1 winding. You only count the wires passing through the middle of the toroid. So I only count 15, should be 16 correct? Half of 16 is 8 and 8 squared is 64. 56.25:1 is what I think you have, no?
@DL6KA3 жыл бұрын
hy mike, How long is the wire behid the 1:49 and no coil in the line ?
@mike-M0MSN3 жыл бұрын
20M of wire before the coil and 1.5M after the coil.
@DL6KA3 жыл бұрын
Tnx Mike.... fine Projekts.....
@johnk80914 жыл бұрын
64:1 will work well on 80/40, but poorly on 10/12/15. The impedance transformation is too high for the upper bands. I use 14/2 turns or preferably 13/2 turns ratio
@mike-M0MSN4 жыл бұрын
Thank you 👍 will give it a try
@paulschmolke1883 жыл бұрын
Nice work, neat tidy, well detailed...does it work well?
@mike-M0MSN3 жыл бұрын
Yes, absolutely
@TA4A-324 жыл бұрын
How is performance and QRM level ? and how much meter wire use 80 to 10 M antenna ? 73 TA4AU
@mike-M0MSN4 жыл бұрын
Take a look.. g0kya.blogspot.com/2017/01/a-shortened-multi-band-end-fed-half.html
@RonanCantwell4 жыл бұрын
Nice build. First thing he'll do is peel off your stickers, put his own on and flog it on his website 😂
@mike-M0MSN4 жыл бұрын
LOL
@FromthehamshackwithNJ4Z3 жыл бұрын
Gonna have to get you Callum both a power screwdriver...
@mike-M0MSN3 жыл бұрын
Cheers I’ll watch the post 😂😂
@dback44304 жыл бұрын
Very nice. I made a 49:1 14 gauge enamel wire using 3 type 240-52 toriods. I also have the DX Commander. My end fed is in inverted L. Up 35 out 90 ish feet. I have found very little difference on receive between antennas most of the time. 40-10. I don’t have the 80 on DXC yet. Why did you go with 64:1?
@mike-M0MSN4 жыл бұрын
found it to be more stable and better for 20m - 10m Bands
@luigibellissimo4 жыл бұрын
ottimo lavoro !!!!.
@mike-M0MSN4 жыл бұрын
Grazie
@aeron-mw7ofs3 жыл бұрын
would a 240-31 core work ?
@mike-M0MSN3 жыл бұрын
this doc should help reeve.com/Documents/Articles%20Papers/Ferrite%20Beads/Reeve-Hagen_FerriteBeads_P1.pdf. but Yes
@aeron-mw7ofs3 жыл бұрын
@@mike-M0MSN cheers Mike 👍
@g0fvt4 жыл бұрын
Neat job.
@mike-M0MSN4 жыл бұрын
Thanks!
@k2icc4 жыл бұрын
Why a 64:1 and bands to be used? Thanks.
@mike-M0MSN4 жыл бұрын
I prefer the Higher Impedance of the 64:1, 80M to 20M bands
@k2icc4 жыл бұрын
@@mike-M0MSN I got a 9:1 with results so the internal tuner can handle. Now, ordered and received the 49:1 and planning to install it and test. Wondering about the 64:1, but if I decide to test, will do my own this time instead of ordering. Thanks.
@richarde7353 жыл бұрын
Mike, you operate that hot glue like you been to way too many women’s club functions... just sayin’ I’ll be gluing my cores into the 49:1, I just built as well.
@AliReza-zx8km4 жыл бұрын
Nice........................
@charlesgannon11644 жыл бұрын
why not use a vice and a drill motor ?
@mike-M0MSN4 жыл бұрын
great idea
@jamessawyer46254 жыл бұрын
I thoght you would test it showing the return loss etc. Nice former
@mike-M0MSN4 жыл бұрын
May be in the next video
@paul-c75414 жыл бұрын
Your a brave man, if I dared to do this, on the kitchen worktop my wife aka Atilla the Hen would kill me. 73 Paul M0BSW
@mike-M0MSN4 жыл бұрын
She is a good catch... :)
@jrfoleyjr4 жыл бұрын
@@mike-M0MSN Ahhh a switch from a hen to a fish. Right smart change. 😉😊😏🙄😇
@Macro-photographer3 жыл бұрын
I was wondering as a seasoned radio ham how many radio station kitchen worktops have small drill holes in the top? Oops sorry love
@gmw30834 жыл бұрын
I have no idea what this vid shows. Have no ham equipment. Not a ham guy. I would like to know if there's a way to get internet in the middle of nowhere via ham somehow. Closest cell tower is 18 km away. Thanks.
@mike-M0MSN4 жыл бұрын
Yep and you do not need to be a Ham, see link www.wimo.com/en/antennas/gsm-lte-mobile-phone-antennas/antennas-for-4g-lte/60072
@radionb3i3 жыл бұрын
Why 64 to 1 vs. 49 to 1?
@mike-M0MSN3 жыл бұрын
I prefer a 64:1 (3200 ohms) as this transformer gives you more head room.
@radionb3i3 жыл бұрын
@@mike-M0MSN sorry to sound stupid.... What do you mean by Head room? Do you mean useable bandwidth.... Does 64 to 1 allow for a shorter wire?
@mike-M0MSN3 жыл бұрын
No, the end of a halfwave wire is around 2000 to 3500 ohms so a 49:1 works as 50x49 =2450 ohms at the antenna connector and 50 ohms at the coax connector. Now if the EFHW wire is at 3000 ohms the 49:1would still work but with a higher SWR. I use a 64:1 as I feel it works better as it allows for a higher impedance.
@RichardDePas4 жыл бұрын
Have you tried a 31 mix toroid? K9WWW
@mike-M0MSN4 жыл бұрын
No I haven't, I will take a look..Thank you 👍
@swadeyboy56754 жыл бұрын
Mike, always enjoy your content and enthusiasm. I am wondering if i could use this design at my home. I have had to take down my vertical from the bungalow due to complaints. Maximum height at bungalow is 7-8mtrs with a 16mtr run to end of garden max height at that end would be 3mtrs? Cheers
@mike-M0MSN4 жыл бұрын
Yes, absolutely
@aheriady4 жыл бұрын
Bravo, from yc0log, juliet kilo tango, Jakarta, Indonesia
@thodeus4 жыл бұрын
👍
@JimN5QL4 жыл бұрын
Put on another sticker that says warranty void if seal broken!
@mike-M0MSN4 жыл бұрын
LOL.
@OldF10004 жыл бұрын
For a Ham that's a challenge not a deterrent ; )
@lb6ciradiostuff4903 жыл бұрын
That cap will say byebye on first digital mode. You need a bigger gun :) Guess hos I know :) - 73 LB6CI
@mike-M0MSN3 жыл бұрын
lol, cap upgrade needed
@lb6ciradiostuff4903 жыл бұрын
@@mike-M0MSN Yes sir 😂👍
@josephmbaretincic31633 жыл бұрын
And what size cap do you recommend?
@mike-M0MSN3 жыл бұрын
Well I have had a 150pf 4KV cap in my EFhW for over 3 years now without any issues, (350 max watts) but the higher voltages the better.