If you are not using the concrete for a self supporting tower, why not use a roof top platform? Poor the concrete with long bolts to bolt to the plate so it won't move. Set the tower on the plate and
John, Whatever you use, put one right at the rotor, ground it to the tower, and same thing for the STEPPIR. Then use them also at your ground window entrance to the shack. Putting one at the rotor/an
What about the galvanization on the inside of the tower leg? Jim, KR9U up sections crank ups. galvanizing ground _______________________________________________ ______________________________________
Gregg, It is all about protecting your equipment. Grounding the coax at the bottom of the tower will help take any lighting induced energy from tower into the shield of the coax and dump it to your g
There is also the problem with the HDR-300 where the platform is held to the main shaft with a 1/4" key. That key also is a weak spot. What we did was to braze a (I think it was called) a Q-lock with
<<I am planning a 160m vertical with elevated radials, using Rohn 25G tower sections. Years ago Array Solutions had custom made insulators for Rohn 25. You might check with them. Jim, KR9U __________
You should have a good ground system using multiple ground rods extending out from the tower base with the coax shield connected to the tower at the top and especially the bottom of the tower. You sh
Roger, I totally agree. All you can do with lightning is do your best to manage it. Twenty some years ago, after just putting up the tower I took a strike and toasted most everything in the shack as
But you don't want to "let" it go up if you can help it. The higher it goes up, the more potential for damage to the equipment. One of the goals of the entrance panel is to help mitigate the ri
A couple things here. If your wired network is using a cable that is anything over 100 meters, you are at the extent of what you can run. The reason is that for each pair of conductors in a CAT-5/6 c
Eric, Being close to the transmit antenna should not be an issue for the KB7GF or the K9AY, other than damaging the circuitry in the outside unit. For instance, will the terminating resistors in the
are going really high it not necessary. In most installations that I have heard or know of, the guys just bury a 4 - 5 ft piece of Rohn 26G in concrete and build from there. Isn't it easier to just
If your reason for another rotor plate with a bearing is due to the fact that you want a place to store the mast pipe while the rotor is out, then some additional consideration might be in order. Jus
33.3 ohms. Suppose he operates on a frequency where his impedance his transmitter will have to drive will be 169 ohms, an SWR of 3.4:1. This will require a transmatch. -- Exactly Rick, If 75 ohm coa
You can bypass the limit switch at the control box to see if the limit switch has failed open. Jumper the two wires to the limit switch and see if it moves in the CCW direction. Jim - KR9U lever arm
I used a rooftop base with concrete base beneath it. The base is the size suggested for a buried base. There are a number of advantages to this approach. - You don't have to worry about moisture in t
The failure mode of a gas discharge tube (GDT) is a short. If it fires during a strike, it will momentarily shunt to ground and either recover or cause a permanent short. This momentary firing of the
One thing to remember is that you need a rotor control line lightning protection box mounted to the tower "at the rotor", and also at the bottom of the tower. If you only put one at the bottom then t
A few of us are helping out a local who is incapacitated with his tower winch; among other things. The Tower is a 40 ft Aluma Tower. The winch has the name "POWERWINCH, a Scott Fetzer Co. Bridgeport
One of our subcontractors used Outback power equipment on a few special builds for us. One system was 1.7 - 200 MHz. It was very clean. http://www.outbackpower.com/ ** I don't have a financial or any