I think it roughly equivalent to Leeson's book recommendation except that Leeson used a BMW part. Or was it Lawson's book? 73, Larry W6NWS Right, I think they are a shock absorber so if you let go of
It is probably most useful with large antennas/arrays unless you ramp up and down the rotational speed. 73, Larry W6NWS I think it is unnecessary of you use a strong enough rotator. I think it roughl
Something like a Ham IV, for example, does not ramp nor does it coast all that well. If you are turning an antenna with a long boom and/or elements there can be a fair amount of torsion when starting
The male pin 571-666099-4 does not come up on a search. 571-66099-4 does and appears to be the correct part. 73, Larry W6NWS --Original Message-- From: Ray Benny Sent: Wednesday, February 13, 2013 6:
DX Engineering sells a drill guide for drilling perpendicular holes. I have seen the same guide elsewhere although I don't remember where (maybe Rockler another woodworking seller?). I have not perso
The advantage to the tools mentioned is that if done right it will guide the drill into a perpendicular position. A vee block and a drill press can do the same thing. A vee block and just a drill may
When I put up my 45G I had hoped to insert a 20 foot 2 inch 95 lb mast from below through the tower sections but I found there was no way to get it in without bending the mast (neither useful or like
Re-drilling and moving the element was the procedure. I had an early C3, EF180B, and EF240X and I had to re-do nearly every element. In my case the initial holes were different on nearly every elemen
The only rivet problem I had in about 10 years was the element to boom mounting on one of the E240X elements that eventually elongated the rivet holes and the element finally fell 120 feet to the gro
The doc doesn't say anything about patents. One device label says it is patented and the other said patent pending (I forget which said what). I bought mine in the early 1990's. 73, Larry W6NWS Champ
Patents are renewable if I recall. I don't know if they changed when they changed trademarks. Trademarks are good as long as the owner is still alive and other rules (used to be 28 years and renewabl
Years ago I had the opportunity to work contests at place that had a 3 stack (bottom was 60 feet and the top was 120 feet I think). We would work Europe early in the morning starting with all 3 anten
I had one collapse vertically during a storm while I was at the base and it is scary. I just sensed it was collapsing and took off across the backyard covering the distance in not too many steps and
Depends on height and load. It is not a rigid "every 20 feet" or even "every n feet". 73, Larry W6NWS I thought Rohn 25 should be guyed every 20 feet. If you are not using a wall bracket then I would
In general at 100 feet Rohn suggests 3 guys 33, 66, and 99 feet. Somewhere around 75 feet and below it is generally 2 guys as I recall. But it does depend on the load. How much do you have above the
Don, K4ZA is over in the Charlotte area. He put some antennas for me in the Raleigh area earlier this year. He has been doing antennas for quite awhile and wrote a book for the ARRL on tower climbing
8.5 inches. Although, I have always had to shim it up a bit (maybe 0.25 inch) with washers at the mounting screws to keep the terminal strip off the shelf. 73, Larry W6NWS Greetings, I'm replacing a
I have a M2 4030M4L. The loading wires for the elements came to an aluminum bar. They used Phillystran from the bar to an aluminum riser above the boom. Initially the Phillystran was just clamped in
ON4UN's "Low Band DXing" had a dipole that presumably covered most of the band. It was partly made from coax. I haven't tried it myself. 73, Larry W6NWS After completing my newest tower, 66 feet of R
Force12 does something similar with its rotatable dipole. Each side of the dipole went to box and had 3 coils in series to the feed point. There were 3 DPDT relays. Each side of the relay would short