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7 Views β’ Feb 6, 2022 β’ Click to toggle off description
www.w8ji.com/2end-fed_1_2_wave_matching_system_endβ¦
owenduffy.net/blog/?p=7984
owenduffy.net/blog/?p=14916
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Thanks! 73 Richard G3CWI
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Date of upload: Feb 6, 2022 ^^
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RYD date created : 2022-02-06T08:06:59.721485Z
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YouTube Comments - 34 Comments
Top Comments of this video!! :3
Enjoying this short video series.
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Thanks for your short videos... good info! I use a Par Electronics EFNW 10/20/40 here at the home QTH with my mchf and have had very good results on FT4 and FT8, Pi4 and JTDX. Worked VK, and ZL on FT4 and FT8... so yes I would give the EFHW a thumbs up for the home QTH! 73! TNX! Tim, DK8MT
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Ideal qrp use πππ
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I was experiencing the RF issue you mention Richard. Cured by adding a big chunky ferrite at the rig end of the feeder. Found that was fine up to 10W, Cannot comment on higher power.
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I use the 80m Multiband UK Antenna and its amazing, I run a ground spike from the unun, then in the shack I have a CMC-130-3K, end result an amazing antenna in an urban environment with no RF in the shack. Not meant to be advertisment, but describing the components I use which work incredbly well with my IC7300 on Data and Phone modes across the bands, it even tunes up to top-band for WSPR and FT8 on low power !
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I must disagree Richard, I've been using EFHW's out portable at 100w for around the last four years and latterly with an amplifier at 400 watts at my new home QTH for several months without any RF issues! The 49:1 transformers I use are homebrew'd to Steve Ellington N4LQ's design using 3x 240-52mix toroids and 12AWG enamelled wire fed with RG213 coax back to a good high quality 1:1 Balun (also homebrew) without any additional counterpoise. Many stations in the US run this type of antenna at 1500w with no RF issues. I would suggest the install or ferite quality is the source of problems experienced being reported by those reporting such issues! 73 Tom.
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RF in the shack with higher power has not been my experience. Two 1.5 metre copper pipes driven into the ground a foot away from where the matching transformer is located (and connected to the earth) is likely the reason - and the ferrite sleeves over the coax as it enters my shed.
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I use a FT50-43 toroidal choke just behind the 49:1 transformer, and then 2m of RG-174 to transceiver. As counterpoise, 0.05 lamba of the lower band of the EFHW.
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It's my #1 antenna for portable QRP operation. Mostly, I use my home-brew 20m long 7-band EFHW that is super light and weather proof. I wrote a 50+ page document about it. To avoid getting blocked I can't put up a link, but you'll find it for sure.
Edit: Owen Duffy has a lot of great content for inspiration. Be critical and don't follow blindly the standard recipes that are mostly shared in the internet, but measure and compare.
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I run 20W through an EFHW with no ground or counterpoise. 50 feet of RG-58 as feedline and a common mode Guanella choke at the radio. Never had an issue with RF coming into the shack even working digital modes like FT8, JS8, and Winlink. Maybe if I ran higher power I would need to think about grounding the antenna, or choking off at the antenna. π€·ββοΈ
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I use EFED HW Antennas one 160/80/40 the other 80-10M at 400w no problems FT 8 works with ferrice filters
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My High power 49:1 and Kevlar wire end fed from g4icd is fine at 400w with no common mode choke in line.
I have had issues at qrp with a 49:1 and 1mm wire but soon sorted it with an mfj CMC...
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Thank you. I was just about to put up an EFHW at home. I think not now.
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For QRP the EFHW is Awesome. I have a small home brew 49:1 Transformer when pared with 32.5 feet of SOTABEAMS wire and five watts it works the world. Thanks K7WHN
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This is a MASSIVELY under exposed element of EFHWs. They are great for lower power, and they absolutely do create horrible RFI when you lift that power. I was running an air spaced coax choke and a commercial common mode choke in line, and it was still only just tolerable.
They are very 'in vogue', but this aspect is scarcely talked about.
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That is just not true (well it is if you don't build it correctly)......Three simple steps
1 ensure the transformer is grounded
2 place a choke at the feed point
3 place a choke at the shack entry point
Very misleading video clip all the same.
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The hwef is a dipole, no better or worse than a half wave centre fed dipole. The problem is not with the antenna it is with people not understanding how to properly feed it.
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you don't know what you're talking about! If you 49/1 unun and at least 35 feet of coax and use a current balun close to your feed thru you will not have any problems even at higher power levels.
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I using hyend Fed from holland
And puting 1.
5kw on it using line iaolator also about 4.2m below transformer. Ot works well any rf...
IT is full lenght 40m
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@jason2e1hko59
2 years ago
Totally agree,, I only use one for portable operations. I have had the odd issue with WSJTX on my windows tablet dropping communication with my FT817. It normally happens when I forget the radio is running max RF output. It may only be 5W, but itβs enough to cause issues. I normally use the lowest RF output setting without any issues for data modes. Great channel content, keep up the great work π
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