Radio Preppers

General Category => Antennas => Topic started by: gil on March 09, 2018, 02:00:28 PM

Title: Revisiting the EA3GCY MEF-1 EFHW Tuner.
Post by: gil on March 09, 2018, 02:00:28 PM
Hello.

A while ago I tested the MEF-1 but had some trouble adjusting the SWR. The problem was actually due to my MR-100 antenna analyzer. I tried again and this time got a perfect SWR, from 1.1:1 on 14MHz to 2:1 on 14.35MHz. That's a lot of bandwidth. My wire is 33ft long, or 10.1m. The Reverse Beacon Network report was quite surprising with quite a few spots from the United States! Now I need one for a 30m end-fed.

(http://radiopreppers.com/images/MEF1-RBN.png)

Gil.
Title: Re: Revisiting the EA3GCY MEF-1 EFHW Tuner.
Post by: Jon_Garfio on March 10, 2018, 02:11:20 AM
I used the Ilertenna for 40m and 20m with good results.

 However for 30m the Ilertenna doesn't work fine and I use the Mountain tuner of Sotabeams.

I am waiting for. Shark 100 analizer from China...



Enviado desde mi Redmi Note 4 mediante Tapatalk

Title: Re: Revisiting the EA3GCY MEF-1 EFHW Tuner.
Post by: gil on March 10, 2018, 04:18:15 AM
Hello Jon,

Did you try it with different lengths of coax or a counterpoise? What was your wire length?
I haven't ordered yet, out of money, but it's next on my list...

Gil.
Title: Re: Revisiting the EA3GCY MEF-1 EFHW Tuner.
Post by: Jon_Garfio on March 10, 2018, 02:22:07 PM
Hello Jon,

Did you try it with different lengths of coax or a counterpoise? What was your wire length?
I haven't ordered yet, out of money, but it's next on my list...

Gil.
For 30m I use a radiator length of 14.23m and a counterpoise 4.74m.

Almost I used the recomended for Javier Solans from EA3GKY kits and the same.

The coaxial is a lead of RG-174, tested and working fine.

This week I made a picobalun from Sotabeams todo make a ultralight 30m dipole (winner Horse).

Enviado desde mi Redmi Note 4 mediante Tapatalk

(https://uploads.tapatalk-cdn.com/20180310/f0cfe4926126372350f846b518506363.jpg)
Title: Re: Revisiting the EA3GCY MEF-1 EFHW Tuner.
Post by: gil on March 13, 2018, 06:14:50 AM
Gil.