When kc1xx finished up my rohn 55 180' tower he had a nice electric capstan that bolted on the bottom of the tower. Best way to pull up tower sections I have ever seen, the only thing I didn't care f
The location of the stub may change the tuning due to some reactance introduced when the stub is slightly off its tuned point, but the correct length is measured from the T connector where it is inse
The original design for those yagi's is horrible. I reoptimized one years ago into what amounts to a long boom 5 element which was much better than the original. Today you can probably do even better
I prefer rg-213 for rotor loops. Just tape to hold cables to the tower legs is more than sufficient. No need for hose clamps, cable hangers, conduit, or other fancy brackets, and no need even for exp
In my experience with a 2 element 45' boom wire yagi at 150' it was disappointing. It had poor f/b (it was reversible design), and gain rarely was better than my 4-square. Now that the beam is down a
This is a better topic for a prop reflector.. but don't just turn off because 20m dies. Often during flares there are odd enhancements on 10m. I have also heard some great 75m signals out of Europe a
$3500 for an almost 50 year old tower seems a bit expensive to me. That would be the equivalent of $175 for a 10' section. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net
The 'right' mix is what the manufacturer or engineer calls for. Rohn's standard foundation drawing calls for 3000psi. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cl
You might take note, this is not a camera, it is just a usb video capture box and software. As such I doubt it could control x-10 devices in the house, unless maybe it has some other connection to a
1 use 10ga insulated stuff here, even the moose can't break it. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net ______
On the tower side I would say, no problem. However on the house side you may want to consider a change. Assuming you live somewhere that the ground freezes you may want to consider a base under the t
Try to stand in the middle of the x's. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net _______________________________
Sounds about right. the m2 full size 40m 3 ele is 250#. A good tram system would be required, or a stout crane to get something like that up on a tower. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.
Always use a back guy on a tram, the forces are just too large even with relatively small antennas to put on a mast. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Clu
A tram wire is normally connected above where you want the antenna mounted, often to the mast above the top of the tower. When you tension the wire and add the weight of the antenna it exerts large s
The wx0b sixpak has 6 inputs (one for each band) that can go to either one of two outputs. They are interlocked against putting both radios on the same antenna. You would not be able to have two stat
Just plug it in and use it as is. Unless you are doing fast scan tv or some very unusual microwave stuff you'll never be bothered by the difference. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net
That sounds about normal. The relatively small wire bonding the secondary neutral, pig shell, and probably all the other hardware to the line return wire and then down to a ground rod has a couple pu
Run these specs through your nomographs... 12 ga insulated copperweld at 22 lbs per 1000' with a breaking strength of 900lbs or 10 ga insulated copperweld at 35 lbs per 1000' with a breaking strength
90' high would make a good inverted V for 80m, and would be a good height for the top of an inverted L for 160m. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster