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Reviews For: MyAntenna EFHW Antenna MEF Transformer (all models)

Category: Antenna parts, accessories, incl. baluns, hardware, etc.

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Review Summary For : MyAntenna EFHW Antenna MEF Transformer (all models)
Reviews: 4MSRP: varies
Description:
This is an End-Fed Half-Wave antenna (EFHW) transformer
Product is in production
More Info: http://myantennas.com/wp/
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0043.3
K8TE Rating: 2022-07-06
Power Rating Grossly Inaccurate Time Owned: more than 12 months.
I bought this transformer (56:1 ration) to use with a NON-resonant wired for RV use. It worked as advertised at 100 Watts. It's rated at 1K ICAS. However, frequent, unanswered CQ's rapidly heated up the core resulting in a rapidly increase VSWR.

IMHO, the power rating is greatly exaggerated! Don't use this above 100 Watts.
LY2H Rating: 2018-11-22
Best Multiband Solution Time Owned: more than 12 months.
I use the 1kW MEF transformer with my own halve wave wire for 80-10 operation in my fixed home shack position for about 2 years now. It is one of the best compromise antennas I ever had. The transformer makes the halve wave wire work multiband which is normally not the case with the End Fed Halve Waves when you tune them with the LC circuit. The biggest advantage of this antenna is that you don’t need the radials for it, since it is a dipole in its nature.(some 0,1 wavelength of counterpoise will suffice as the “return path” for the antenna current). The only small draw back is that you can only put into it a real 1Kw in CW mode for quite a short time or for a quite a short transmission cycles. Please note it is written on the transformer 1kW INTERMITENT power. It means if you work hard in the contest on CQ or in the Dx pileup, the transformer will get hot after ten minjutes or so, and the SWR will jump up until it gets cooled down. If you work SSB, no problem with hard operation and 1kW since the SSB is only a 20 percent duty mode (the transformer “feels” only some 200W of power on it despite you pump in 1kW). For a serious work in the CW contests I also have the 2kW transformer by the same company and use it with great succes and no overheating issues in an End Fed Halve Wave Inverted L configuration for 80-10 m operations from my country side QTH. All this makes me rate it 5. Highly recomend if you can only put up one antenna. Linas LY2H.
W8MIB Rating: 2018-01-29
Water issues Time Owned: 0 to 3 months.
I received as a Christmas gift the MEF-330-1K box that is used on this antenna. Inatalled it and it worked great for two weeks. Turned the radio on one morning and swr was crazy. I went out to check the wire and box and found the box was filled with water and frozen! The installation of the box was horizonal so the weep hole was at the bottom. The coax was waterproofed....I am glad it was a gift and I didn't pay for it!
W6LZC Rating: 2016-12-17
Great upgrade to existing halfwave endfed antenna Time Owned: 0 to 3 months.
I am a current owner and user of MyAntenna EFHW-8010. I have been running high power (500 to 800 watts) but less than the rated 1K without any problems such as changed swr and overheated ferrite core due to prolong use. I was concerned when reading several forums about endfed antennas that many hams were telling users to run no more than 100 watts with some hams saying that it should be limited to qrp only.

So when Danny announced that he has produced a higher power transformer when can handle legal limit that I decided to upgrade my EFHW-8010 to handle the higher power when running an amplifier to give me a margin of safety whenever I was operating with an amp.

Danny shipped my order by priority mail which I received in 3 business days. It was a simple task of swapping out the original transformer with this new transformer. I ran the antenna analyzer and found that the resonance points were close to the original points that no adjustments were needed.

Operationally, I did not noticed any changes when using the new transformer on both transmit or receive. My noise levels remained the same as with the original transformer, an S0-s2 depending upon the band, very quiet.

Interesting observation, I was not able to tune on 6 meters with the original transformer, but with this unit, I am able to tune 6 meter with flat swr. I will test this next year when the band open to see how it performs.

So far, I am very happy with this upgrade. I would highly recommend this product for those wanting to operate with an amplifier into an EFHW antenna with a margin of safety.