I've planned a 2 x 8 element yagi array with elevation. The antennas
will be vertically polarized
8-element antenna has 11 dBd gain and the boom length is 3.8 m. A pair
of these antennas would provide 14 dBd gain. I
will be able to benefit from long operating hours since the
array will point at the Moon as long as it is
above the horizon. Elevation also
reduces terrestial noise which is
strongest when the antenna array is pointing at the horizon.
EME antennas (ver. 2) - realized
2016. I've reviewed my antenna design. The
first draft was 2 x 8 element yagis. It would require a 3
meter cross-boom made of steel tube. This kind of
boom would be too heavy
for my KR-550 rotor.
new plan is using a 2 meter long ash tree cross-boom and
fit 2 x 6
element yagis on the boom. This array will have less weight, and the wind
resistance will be low. It will be easier for the KR-550 rotor to
handle. The two yagis will be PA144-6-2 from the company Dual
(YU1CF). Each antenna has 9.2 dBd gain and a pair
will provide about 12 dBd gain. This gain is below the figure set
by DK3QN Klaus. He recommends minimum 15 dBd antenna gain for
EME on his EME page
. I may add another pair of 6-element yagis later increasing the gain to 15 dBd.
Fig. 2. EME antennas for 144 MHz (2017-03-24).
Fig. 3. OZ1BXM on the roof (photo by XYL).