My EME system

My EME system. (ideas)

It is still under development, and still consists mainly of ideas. On this page I will share some of those ideas. Due to lack of space, it will be a 432 MHz system. A key component is of course the antenna system and I’m thinking of using the design by DK7ZB or YU7EF. From previous experiments, I have 23 elements Cue Dee antenna material and I can use those for the new antennas. Stacking four of those would be a nice start.

Antenna (a group of four)

DK7ZB 16EL 432 MHzDK7ZB 16 Elements 5.5 WL boom.

DK7ZB antennas use 28 or 12.5 ohm impendance, why 28 Ohm? for the VHF-Bands (50-50.5MHz, 144-146MHz, 430-440MHz) a radiation resistance of 25-35Ohm has the best balance for gain, back- and sidelobes, bandwidth and SWR at tenable losses in a Yagi.

Bandwidth 430-435MHz
Boom 3,88m
Gain 15,5dBd
F/B > 40dB
3dB-angle (hor) = 24,4° 3dB-angle (ver) = 25,4°
Stacking distance vertical 1.70m Stacking distance horizontal 1,70m

EF7015 StackedYU7EF 16 Elements 5.3 WL boom (EF7016)

All YU7EF antennas are optimized for pure 50 ohm feed impedance with minimum possible reactance to avoid need for some of specific feed solutions and impedance transformations such as Gamma Match, T-Match, Hairpin etc. This way all antennas have very low internal loss and very good efficiency.

Bandwidth 432-434MHz
Boom 3,76m
Gain 17,35 dBi
F/B 21 dB
3dB-angle (hor) = xxx ° 3dB-angle (ver) = xxx °
Stacking distance vertical 1.43m Stacking distance horizontal 1,48m

Square Power SplitterStacking

To connect the antennas, I use the following system which uses square or round aluminum profiles. It will also provide the impedance matching.


EME PreamplifierMaybe an ATF54143. The ATF54143 is a PHEMT device from Agilent technologies that can provide low noise figures combined with high signal handling characteristics.




Kenwood TS-811aUHF Transciever, Kenwood TS-811e.





Kuhne electronics