Monday, April 7, 2014

The Tower Project that Just Won't Die!

Well, here it is, the first part of April and the 60 ft tower project with the HF Yagi, the 2M long-boom Yagi and the 2M/70cms vertical omni is still bogged down in logistics. My main tower guy and climber, Bill Wilson, KJ4EX, is thankfully recovering nicely from his heart attack around Christmas time last year. I have been in contact with a person who owns a commercial tower company in Winder, GA and he has surveyed the situation and thinks it will take him and his crew about 4-5 hours to complete the installation, run the coax, mount the antennas, rotator, etc. and run the guys....cost: $around 400-500 Buck-a-roonies!! That's a whole bunch more cash than K7SZ has available on short notice. Ryan, the tower company owner, said he would be available in April and May so maybe, if I can find the cash, the installation will be completed.

Originally I had decided to include an HF Yagi, a 6M Yagi and the V/UHF Omni on the mast that would protrude about 12 feet above the 61 ft tower top section. This would give me a total installation height of about 73 feet above the dirt. Not bad, considering. Sure, I would have liked to have a 90 or 100 ft installation, but I cannot complain, especially in light of the cost of the project todate.

Bill, KJ4EX, had constructed the 6M Yagi but was having all sorts of difficulties getting it to tune properly before installing it on the tower. Since I have a 6M Cushcraft Ringo on a separate mast on the roof, I decided to leave that 6M Yagi off the tower installation and substitute a long-boom Yagi for 2M in it's place. After scrounging around the area I came up with a KLM 14 element Yagi from the 1970s, which I picked up at a reasonable cost. In inspecting it, I noticed that the antenna had a log-periodic feed system and one of the element clamps had broken, which would take some work with some high grade epoxy putty to put right before it could go up in the air.

In addition to the KLM, I also found a local ham who had a Cushcraft 13 element long-boom Yagi that I picked up at a great price which was fully functional. All I had to do was assemble the boom (again) and bolt it together, which I did. I enlarged the through-boom screws from #8 to #10 size to give it added strength. I have to put this antenna on a test stand and insure that it is tuned for the lower portion of the 2M band (144-145MHz) for terrestrial weak signal work, but that shouldn't take all that long to accomplish. I was able to obtain copies of the Cushcraft manual so I am good to go.

As far as things I have to accomplish before Ryan and his crew arrive some time in May (or June, or July, or.......): wire up the rotator and control box, (I have already tested them out together, I just need to get the long cabling set up and labeled), obtain some low-loss coax/hardline and connectors for the two V/UHF antennas, get the coax and connectors on the cable for the HF Yagi, set the screw-in guy anchors for the tower, and fabricate a piece of angle iron to act as an anchor for the center feed point of the 40M EDZ that will be side mounted from the 55 ft level of the tower.

Stay tuned....I might have this installation completed before Christmas 2014 yet!!!

Vy 73

Rich K7SZ

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