Hi Wes,
You forgot to mention that Chris VK5MC was only running 150 watts
output. His pattern dropped off drastically as the moon exited his
window. When I built my humongous 144 MHz array in 1979/80, I figured
that my window with VK5MC would be a bit wider with the added gain from
the 24 yagi array. It hardly varied at all! He just got louder when I
could hear him. I might have picked up one minute. Great fun thinking
about those times! Thanks.
To make this Elecraft related, I wish I had a K3 for my EME receiver
instead of the Collins 75A4 that I was using back then. The APF would be
fantastic on CW EME. It would have saved me a lot of time modifying the
A4 to make it better!! I replaced the 6BA7 mixers with 6DJ8s. I took
out an IF can and dropped in an R-390A 2.0 kHz mechanical filter. I had
to add a 2N4416 FET to account for the added loss in the filter. The
last big mod was to add another Collins 300 Hz crystal filter in the CW
fillter position. I jury rigged it underneath the chassis on a bracket.
I still have the 75A4 and did a cap replacement last winter. It had not
been fired up since about 1992. It needed work. After it was all working
fine again, I checked MDS (-138 dBm) and close in dynamic range at 2
kHz. I saw 92 dB which is not too shabby and in a different league than
a stock A4. Still it is a good 10 dB below the K3.
Dave K1WHS
On 9/14/2019 12:09 PM, Wes wrote:
I completed my 2-meter WAC by working VK5MC on December 3, 1982. Chris
was using a rhombic, IIRC, 50 wavelengths on a leg and more-or-less
fixed on his rising moon. I believe with some ropes he could "steer"
one end to get a few minutes more on another couple of days a month of
use. Otherwise it was a pretty short window. Modern Yagi designs
blow these away.
Wes N7WS
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