How far apart are those elements on the multi-feed C31XR, just a couple of feet? If you don't do everything just right, you will blow the Rx every time. I would suggest dedicated sets of stubs on the
Here's a repost of my previous msg on the subject: Here's an easy procedure to make a good approximation of line loss, without disconnecting the coax up on the tower: 1. Connect an antenna analyzer t
When the wind is blowing at 80 mph, just think about what is at stake out there, both financially and in the labor involved in replacement. I don't think you want to be relying on seat-of-the-pants g
I'll bet someone used permanent Loctite on those bolts. I think you should buy a new upper housing. It's not a bad idea to buy that housing anyway, because those four bolts are self-tapping and manag
You should be ok. Guys at hinge and apex. Dave Hachadorian, K6LL Yuma, AZ _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weathe
Connect a DC ohmmeter between the 10 meter capacitor tube and the 15 meter capacitor tube on each element half. This reading should be less than about 0.5 ohm, after subtracting the resistance of the
-- That would be a good question for Karl Tasjian. On his web site price list, he lists 1/4" stainless lift cables for the LM237 and LM470, but not the LM354. Dave Hachadorian, K6LL Yuma, AZ . ______
I think Rohn uses a "Brake Winch." At least that is what came with my 30 year old 25 foldover. With a brake winch, you can take your hand off the handle at any time in the raising or lowering process
It's almost impossible to predict such interactions. The most sensitive indicator that interaction is occurring is degradation of the f/b ratio on one or more bands. Measure the f/b of the CL36 befor
Google is amazing: -- Suppose the reel has hub diameter Di, outside diameter Do, and width W. Then the volume of wire on it is V = pi(Do^2 - Di^2)W/4 Suppose you have a wire with length L and square
How about something like monofilament fishing line or weedwhacker line used as a messenger cable for a lightweight copper or aluminum wire? Just an idea. My other thought is that a simple vertical wo
-- Start with the inside voltage and resistance checks at the controller end. They are in the manual. If you have too much cable loss, you can run cheap 14-2 (with ground) Romex out to the tower for
-- You can use three short lengths of 2" pipe to roll the tower around on. They don't roll very well on grass, but the friction between the pipes and the tower is low enough that two or three people
In my 1996 catalog, these are shown on Rohn Dwg C610621 These are on Rohn Dwg C620643 Not much is available from Rohn on this subject, although the catalog has a murky photo of a 10' I-Beam, showing
It's easy to try. Just disconnect the wires going to terminals 4 and 8 from the controller, and hot-wire your spare cap to those wires. Hook the cap to the wires, not the terminals. No need to open t
Spray-on belt dressing, from any auto part store. Dave Hachadorian, K6LL Yuma, AZ . _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wirel
-- I've had one of these up for 28 years now. Data is in the Rohn catalog. The main disadvantage is the 130 pound weight limit at the apex of the tower. Four way guying is required, but the footprint
The easiest way to check for interaction on a directive antenna is to measure its f/b ratio. The f/b ratio is a very sensitive indicator of interaction. SWR, gain, and resonant frequency are very ins
You really need a structural engineer to figure this out for you, but I think your first assumption of a 4" steel pole with 3' in-ground is much too flimsy. I would start thinking in terms of a large
Specs show 32.5' below the hinge, and 35.5' above the hinge, for a total of 68'. At that height, the safe weight at the apex is 100 pounds, which means that the max allowed moment about the hinge is