MEF-107-2K+

Rated 5.00 out of 5 based on 3 customer ratings
(3 customer reviews)

$149.95

MEF-107-2K+ Multiband EFHW Antenna Transformer,  Covers 4 Bands 160/80/60/40m  / wire not included / One End Insulator included

  • High Power capability – 2kW+ ICAS
  • LOW insertion loss ~0.2dB
  • NO TUNER needed

 

Description

MEF-107-2K+ Multi-Band End Fed Half Wave Antenna Transformer

Now you can make your dream low band antenna with just 259feet of wire (~79m) and operate on five bands without use of tuner at legal power using as much as 2kW+ ICAS.

Features massive ferrite core weighing 1.25 pounds (0.57kg) and very low Insertion loss

This is an End-Fed Half-Wave antenna (EFHW) transformer covering 160/80/60/40/30m amateur bands or any frequency in between. It transforms high impedance ~3000 Ohms at the end of half wave radiator to 50 Ohms and features very low insertion loss.

  • NO TUNER needed!
  • NO counterpoise needed! (Grounding recommended)
    • Just adding a wire radiator of ~256 feet makes this antenna resonant on 160/80/60/40m.
    • The wire of ~133 feet will give you low VSWR on 80 and 40m.
  • Frequency coverage: 1-7MHz
  • Power Handling: 2kW+ I.C.A.S
  • Weight: 2 lbs. (0.95kg)
  • Hardware: Stainless Steel
  • Connector: Silver/Teflon SO-239

 Assembly

Just add 1/2 half wave wire to this transformer and tune the length to your preference. Note that antenna will be working on multiple frequencies. Half wave for 160m (~256 feet) will be two half waves on 80m and four (4) half wave on 40m band. If you desire to use it on  30m or new 60m band only, just cut the half wavelength wire for that frequency or any frequency from 1-10MHz. Wire length can be calculated by following formulas:

  • Length (feet)= 468/Frequency (MHz) orlongwire1
  • Length (meters)=142.5/Frequency (MHz)

Always cut a wire a bit longer to allow for tuning to your desired frequency. Tuning depends on height above ground and nearby objects. There are so many ways to install the wire and your imagination is only limit. You can do it horizontal, vertical, sloping, in inverted “L” shape, Horizontal “L”, in “inverted “V” shape etc.

Such antenna will not need radials and in most cases NO Tuner at all. You can use it as vertical against good radial counterpoise too. Be a HAM and do some experiment.

Grounding at the lug next to the SO239 connector is recommended! Long wires tend to collect electrostatic charge (usually when the weather is stormy) which can produce ESD (electrostatic discharge) at the end of your cable and damage your equipment.

Insertion Loss measurements of MEF-107-2K+ transformer

Insertion loss for MEF-107-2k+

 

3 reviews for MEF-107-2K+

  1. Rated 5 out of 5

    Mike Thornton

    I installed my MEF-107-2K+ with 125 feet of number 14 stranded and insulated wire, in an inverted V configuration. Apex is at 30 feet with the ends about 15 feet off the ground. In my situation, the wire runs parallel to an RV shed with a metal roof for about 35 feet. Because of this plus the close proximity to ground at the ends, my 80 meter SWR at resonance is about 2:1. On 40 meters, SWR is close to 1:1. After speaking with Danny, he advised to use my tuner and just go ahead and use the antenna on 80 meters at full power, which is what I did. I can tell you the antenna works great, both on receive and transmit. It is replacing a G5RV style antenna. The new antenna is a great improvement. Friends who are located approximately 1,000 miles from my QTH in two different directions tell me my signal is stronger than it was with my previous antenna. The MEF-107-2K+ is built very strongly, and I am looking forward to many years of use.

  2. Rated 5 out of 5

    Bill

    I used a 250′ wire for my 1.9 Mhz antenna. It is super on 3.8 and also very well on freqs above using a remote tuner. I get 1.1:1 on 1.9 and < 2.0:1 on the entire 160 band. my wire is not straight, it is through trees and I use a very well grounded connection switch at the feed point. I am only running 100watts currently but will up to 1.5KW soon. I use it very successfully on 75 with a 1.5:1 below 3.8 Mhz in the DX window. This is a great balun. I tried my own wind without the same result. This xformer is a simple solution. Highly recommend.

  3. Rated 5 out of 5

    Kall

    I do like my 8010 antenna. works relatively well. Had a CMC that didnt work, it was replaced with out any hassle, as well as a broken clamp on ferrite, was offered a discount on the next purchase. that’s good service.

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