DXCC: 89 worked, 65 confirmed

GRID SQUARES: 344 worked

My first QSO at the Magic Band, 50 MHz, was in 1996. I bought an Icom IC-706, which had also six meters. We made the first antenna, a ten element Yagi, and I got stuck with the magic band. Then I had Icom IC-736 and I worked most of my six meter contacts with that rig. Now I am QRV again with Elecraft K2 and XV50 transverter. Running 20 watts to two element yagi in KP32OH.

HF triband  beam and 6 over 6 for 50 MHz P8270333.jpg (12196 bytes) P8270341.jpg (13432 bytes)

Antennas used in the past

MFA506P, 6 element Yagi

mfa506p.jpg (16180 bytes)

I designed and built a new 6 element Yagi for portable operation. This is designed with 50 ohm direct feed to a split driven element. Coaxial cable is equipped with a quarter wave stub to act as 1:1 balun. All 16 mm thick elements are insulated and easily removed and assembled to the boom. The 45 mm thick boom is splitting into two 3.5 m long pieces. So, the whole antenna goes into quite small package for easy transport. This antenna was used first time in 6 m NAC contest on our yard and then used in OH4AB's summer camp. It has been Ok so far. Not any DX stations have been worked, some Europeans though during some ES-opening.

Maybe one day I will take this antenna to some rare square in Finland...

10 Element homebrew monoband Yagi, 15 m boom. 1996-97

Great gain, but very very narrow beamwidth! My current 6 element Yagi is much more easy to work with. It was a nice antenna though and my first for 50 MHz.

10 el 50 MHz Yagi

Jouni installing director #8
OM Jouni, OH4KZM, installing director # 8.

10 el Yagi against 12 m tower

MFA506, 6 el Yagi for 50 MHz. 1997-2000

First DX contacts in 6 m with this single antenna in the summer 2000.

MFA506, 6 over 6 element 50 MHz Yagis. 2000-2003

Boom length: 6.0 m
Boom size: 45 x 2
Element size: 16 x 1.5

Gamma matching

50 MHz Yagi gamma matching

6 m Yagi on the ground upside down

Two 6 element Yagis are used on 50 MHz. Lower is in height of 16 m and is fixed to direction 240 degrees (Western Europe/South America). Higher is in 20 m and is rotatable. There is a relay system to select only one antenna or both. First test for this system  will be 6 m Activity Contest in August.

Switching and beaming to two direction proved to be effective in last 6 m contests in year 2000. Some stations could be easily worked, when beaming higher antenna to north and switching to other antenna when weak signal was heard from back of other Yagi. Also there was big difference on ES openings. E.g. one SP station was 55 on higher Yagi and 57 on the lower! So take-off angle of lower Yagi was better suited for this QSO. Some stations could not be heard with one Yagi, but with two Yagis stacked QSO could be made.

One antenna was sold to OH4BC and other one to OH4AB.

Updated: 24-tammi-12

2000-2012 Jukka Tarvainen

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