Roger, Your experience with open wire line is interesting. I had a full size delta loop strung up for 80 meters off my tower and I fed it with ladder line. It picked way too much local noise. I took
Hans, I would have suspected the 15 meter traps too. I would start doing the process of elimination to narrow down the culprit. Disconnect the coax feeding the TH7 in the shack and put a coax jumper
I have an inverted V strung from my tower for 80 meters. The apex is at 90 feet and the ends are supported by 10 foot poles at the corners of my property. The inside angle of the V is about 90 degree
Marsh, That sounds very worthwhile then to raise the ends ! I have several TV type push up masts that are lying there waiting to be used. I think they are 30 feet fully extended. I think I will slide
Jim, I see your point. I have easy to install (and extend up in the air) telescoping supports for the ends of the V. I've found I can go from 10 feet to 38 feet with them. I am going to test the ante
thanks Larry, I did forget about the RBN. Great for this testing ! Bob K6UJ _______________________________________________ _______________________________________________ TowerTalk mailing list Towe
I agree with John. On a smaller scale that is what I do. I grew weary of hoisting the antenna up and down to adjust the matching so I strung a rope from the tower at 50 feet high and going out at 45
Joe, So the laws of electromagnetic radiation physics do not apply to the east coast LOL ! I have been following this discussion and Jim is basing HIS contributions on actual data. You are digging yo
Wayne, I would choose option "B" also hihi Tom Schiller, N6BT, told us during a talk on antennas that he made DX contacts using a light bulb for an antenna on top of a fence post. This might be a con
Try out DX Engineering's mast calculator : http://www.dxengineering.com/mastloadestimator 73, Bob K6UJ What has become of WD9P's Mast Calculator that used to reside at: http://www.math.niu.edu/KARC/m
That antenna was produced by the original Force 12. Tom Schiller, N6BT who was the Force 12 owner when it was made is available at tom@n6bt.com. I would contact him and see if can provide you the inf
That sounds like a great antenna. ! Bob K6UJ John KK9A I have what I believe is a c3 xl that belonged to an Elmer of mine who is now SK. This beam is of 1994- 1995 vintage and is in excellent conditi
Bill, Thanks for the info. I am overhauling one of my older Force 12 yagis and I will use six rivets now. 73, Bob K6UJ We can sell you rivets however you can just as easily go to McMaster-Carr (who h
I found this interesting article (below) on the evolution of Force 12's current Tornado loading coil design from the beginning with the Tom Schiller, N6BT original design to their final Tornado versi
Gary, How about if you "open" the driven element and the directors with relays and then the 40M el's will be invisible on 15. ? Bob K6UJ On 1/3/16 9:55 AM, jimlux wrote: On 1/3/16 6:18 AM, StellarCAT
Stan, Thanks for the addr for the coil calc. Yeah it looks like they got their act together with the Tornado's thanks Stan, Bob K6UJ The Tornado coil is a motorized inductor that compresses or expand
Jim, Thanks for the informative post ! The coils from JK must be the Cadillac of coils ! Bob K6UJ I found this interesting article (below) on the evolution of Force 12's current Tornado loading coil
John, I think they use both fixed and adjustable Tornados. The adjustable on 80 meter yagis. I may be wrong but I think that is what they are doing. Yes I am also glad they no longer use the linear l
Jim, Sounds like copper tubing (without cool-amp) is the way to go. I am impressed with the JK coils. Solid aluminun rod and welded connectors, very nice ! I assume the solid rod coils are pretty rig
Howie, Very professional rebuild indeed ! I especially like the heat shrink sleeves over the exposed fiberglass rods. 73, Bob K6UJ All the talk about older Force 12 linear loading vs. Tornado coil up