EME activity at W7IUV (DM43el) started in June, 1982, and lasted until October, 1991. All activity was on 144 MHz. During that time, thousands of QSO's were made with 349 different EME stations in 49 countries and all 50 states. All equipment was home-brew. The final amp was pair of 4CX250's in P-P with about 1350 watts out. I had three different antennas. The first was an array of 4x8 element Quagi's. Next was an array of 8x13 element Quagi's of my own design. Finally, I built an array of 16x8 element W1JR Yagi's. The cross boom is 30 feet of Rohn 25 tower sections. The vertical masts are 25 feet of chain link top rail. Feed lines are all CATV hardline. Operation was curtailed when the array had to be dismantled in preparation for a move to a new QTH. I never did put it up at that QTH in DM43ch.
After moving to WA, DN07dg, I got interested in WSJT, primarily for MS work. I had put up one of the original W1JR yagis on a short tower for tropo work and after about two weeks had worked all the active stations I could find within MS range. Of course the next step was EME!
As one might expect,
W5UN first. Since I had in the past worked Dave on CW with one of these
watts from a portable location, I was reasonably sure I could do it
My TS2000 with a160 watt brick, no preamp, and the single 8 element
just fine, actually easier than I thought. WSJT QSO’s with RN6BN,
S53LM, RA3AQ, and RK3FG followed in the next few weeks. Contrary to
people would have you believe, this was pretty hard even with WSJT! I
looking at what I could do for more antenna quickly. This is one
tried with XPOL:
After making QSO’s
ON4IQ, the thing fell over. I decided that XPOL was not worth the
effort due to
the complexities of the feed system required. I needed something that
survive the constant high winds I get at this QTH. I was corresponding
VE7BQH about upgrading my W1JR yagis to a more modern design and after
out a few bugs with the 50 ohm feed came up with this:
This 4x8 array of
is the interim EME antenna and worked better than expected. At this
I have QSO’s with AA9MY and DL8EBW, both single yagi stations. My
this QTH on WSJT stand at 62 most of which were made in less than two
running the TS2000 with a preamp now and my old P-P 4CX250 amp at about
watts out. This is a temporary antenna and will be replaced with either
all 16 yagis as soon as I can get the next tower installed.
The fourth tower has been installed and the 8x8 array operational for several months:
Some of the piece
Center of the array.
TVRO dish acutator is used for the elevation drive. Larger box left
center is the preamp/relay assembly. Smaller box with blue tape is the
elevation position transducer assembly. The two port half wave power
divider is fabricated from common plumbing parts and three N
connectors. The main boom is a piece of 2-3/8 inch diameter well
pipe. The hinge is made from a piece of 3 inch well pipe withthe main
boom running through it. Brackets are welded to the hinge for
attachment to the main mast using U-bolts.