Great video. Simple, well explained. Something I keep thinking about. I have all the items in my collection. Sometimes too much gear! Catch you soon Nick
great video , i also use a 49:1 transformer a wire and a dx commander 10 meter pole , Its cut for 20 meter band but offers a very low swr on the 11 meter band , It really gets out on the 20 meter band , 10 meter band and 11 meters . I did have a imax 2000 up but this wipes the floor with it
You said they are about the same length? Have you checked the SWR for other bands, like 6 meters etc, just wondering I need something for 6 meters, a half wavelength on 11 meters is about 18 feet with a harmonic of doubling that putting it near 6 meters? 27 x 2 =54 If you could check it for 6 meters, I would appreciate it? Just a thought. I have seen some verticals with a 6:1 transformer but not sure about 49:1 but you just proved it will work?
Ive not tried it up on 6m. I don't think the FT240-43 ferrite are very efficient at 50mhz , but its gota be worth checking out. Will let you know when I do..
Hi, A half wave length would be 5.47 metres or 17 feet 11 inch. For 27.405 if memory serves is ch40 . It has a good band width . If you cut slightly longer then fold back instead of cutting to get the lowest Swr.
... the T200-2 iron powder core has better efficiency on the 'higher bands'... if you look at the permeability graphs the #43 core mix maxes out at around 10mhz... check it out and try again with a #6 ir #2 iron core material
Yes, but slightly different in that it's a half-wave over a quarter-wave matching coil, fooling the radio into thing that it's seeing a 3/4 wave colinear.
@@n0vty873 Yes, that's what I said - electrically a 3/4 wave colinear to show 50Ω instead of 2450Ω, but physically a halfwave with performance characteristics to match. Who said anything about jibber jabber magic?
@@n0vty873 I'm saying that it IS a physical halfwave that behaves (electrically not physically) like a halfwave over quarter-wave collinear, in order to get the same 50Ω-ish impedance match of a true 3/4 wave. What is it about these facts that you don't like?
Great video. Simple, well explained. Something I keep thinking about. I have all the items in my collection. Sometimes too much gear! Catch you soon
Nick
Glad I found your channel, EXCELLENT VIDEO. I SUBSCRIBED.
Thanks for the video. It was clear and simple. I am inspired to try something like this for portable operations.
Thanks Stuart, I use the efhw out portable often 👍
great video , i also use a 49:1 transformer a wire and a dx commander 10 meter pole , Its cut for 20 meter band but offers a very low swr on the 11 meter band , It really gets out on the 20 meter band , 10 meter band and 11 meters . I did have a imax 2000 up but this wipes the floor with it
Love them 5 stars good looking radio
I would use a MFJ 915 ferrite blaun with the Antron 99, the homebrew and any antennae. Helps reduce stray RF and white noise.
terrific job 73 my friend from kb2uew
Nice job. I homebrew one with a ferrite of an old Tv, 9:1 work's fine with 4,40 meters wire, with low Swr from 7 MHz to 28 MHz.
I still have the Antron 88, still works fine with his age..
was there any counterpoise or choke used with the EFHW?
Hi Paul, there is no counterpoise or choke used on this efhw. 👍
You said they are about the same length? Have you checked the SWR for other bands, like 6 meters etc, just wondering I need something for 6 meters, a half wavelength on 11 meters is about 18 feet with a harmonic of doubling that putting it near 6 meters? 27 x 2 =54 If you could check it for 6 meters, I would appreciate it? Just a thought. I have seen some verticals with a 6:1 transformer but not sure about 49:1 but you just proved it will work?
Ive not tried it up on 6m. I don't think the FT240-43 ferrite are very efficient at 50mhz , but its gota be worth checking out. Will let you know when I do..
Sorry its taken so long , checked it on 6m for you using the 10/11m halfwave wire ..
ua-cam.com/video/x9wGM-tUvtg/v-deo.html
Just visiting, thanks. In short a dipole a dipole
Any idea on the correct wire length for the USA CB band?
Hi, A half wave length would be 5.47 metres or 17 feet 11 inch. For 27.405 if memory serves is ch40 . It has a good band width . If you cut slightly longer then fold back instead of cutting to get the lowest Swr.
@@benm1mlm846 Thanks!
... the T200-2 iron powder core has better efficiency on the 'higher bands'... if you look at the permeability graphs the #43 core mix maxes out at around 10mhz... check it out and try again with a #6 ir #2 iron core material
I'll bet three 1/4 wave radials would make the end-fed quite a bit better.
Also 10 ga. Wire would give you less radiation resistance.
th A99 is an endfed half wave antenna
Yes, but slightly different in that it's a half-wave over a quarter-wave matching coil, fooling the radio into thing that it's seeing a 3/4 wave colinear.
@@RF_Burns No, it is simply a halfwave antenna with a matching coil to match it to 50 ohm coax, no gibber jabber magic bs
@@n0vty873 Yes, that's what I said - electrically a 3/4 wave colinear to show 50Ω instead of 2450Ω, but physically a halfwave with performance characteristics to match. Who said anything about jibber jabber magic?
@@RF_Burns only a half wave, you keep making it out to something it can not be
@@n0vty873 I'm saying that it IS a physical halfwave that behaves (electrically not physically) like a halfwave over quarter-wave collinear, in order to get the same 50Ω-ish impedance match of a true 3/4 wave. What is it about these facts that you don't like?
That's what I thought. I would rather use a coil .