I have a mast extending 30 feet above the top of a 45G which is at 100 feet. I use two thrust bearings to eliminate any side loads on the rotor which is a PST-61. To work on the antennas http://www.r
the Doesn't even take that. Tape measure to the base of the tower and a protracter, or transit. You know the base and two angles so you can easily compute the height. Or you can skip the computing a
Here, as in Midland Michigan (Homer Township) The tower is the supporting structure and the mast is not figured as part of that. Zoning requires any tower over 80 feet be properly engineered. They a
OTOH twice the height isn't practical here. The tower is far enough from the line that no part of it or any antenna even if turned vertical could come within about 30 feet of the line. Roger Halstead
Likewise, I use two thrust bearings and unlike others here, I use the thrust bearings to support all the weight of the antenna system which is substantial. Probably on the order of 600#, give or take
If I understand correctly Jerry, you are just supporting the mast with the top of the thrust bearing, leaving the mast free to slide up and down in the bearing. It is serving as a guide to take the s
The only silversolder I've ever seen was about as close to brazing as you could get without actually brazing. I did a lot of it over the years, attaching pure silver coils to water blocks. The coils
With practice you can fill holes with the stuff. It's just more difficult if you haven't spent time working with it. Smaller tip and OxyAcetylene. Evn the high silver content is as good as or better
I have some tower work and will be up on top in a few weeks. As the tower here has been getting hit about 3 times a year on average it might make a good test even if one example is still antidotal. R
Are your talking about the one WD8RXP in Ithaca Michigan built? That one is in QST, from January 1987. Page 15. It's also the cover. The title of the article was "Mid-Michigan Skyhook". It's not a ma
I'd like to see a crank up design rather than a fold over. Friend of mine, (K8KNY) had one of these fold overs about 20 years ago at Forrest Hill Michigan. Almost identiacal excep he used concrete in
Another thought, or data point: People think of lightning striking under the storm, but I've seen lightning bolts come out of a cloud horizontally. One was a straight line 7 or 8 miles long that then
Kinda makes me think of the outfit that used to sell magnets that fit around your water pipes to remove the ions. Roger Halstead (K8RI, EN73 & ARRL Life Member) N833R, World's Oldest Debonair (S# CD-
I've noted a bit of confustion on the effectiveness of torque bars. First, torque bars do work when rigidly installed. Second they work without resorting to 6 point guys (2 per arm) Third, they are m
I thought that was what I said, but in plain language. <:-)) Rephrased, the work far better with two guy lines than they do with one, but even with one there is more resistance to rotation than witho
One more thing to think about and that is the type of guys used. Although EHS is very strong, it is heavy and that leads to a deep catenary. EHS may not stretch measurably unless badly over stressed
<snip - gotta look up the info for this part. I lent my new 1986? catalog I can say, without a doubt, the one ton is a small fraction of what a 25 G is rated to support. If you are willing to settle
When I had our service changed to undergrund the linemen told me they have more problems with underground service feeds than the overhead due to lightning. Roger Halstead (K8RI, EN73 & ARRL Life Memb
Roger Halstead (K8RI, EN73 & ARRL Life Member) N833R, World's Oldest Debonair (S# CD-2) www.rogerhalstead.com Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and
The 6/20 means the cable consists of 6 individual strands of #20 wire. However you need to know the what kind of steel to know the strength. Radio Shack sells a cable similar to that and it is very s