Guys, Theres a great benefit from turning the antennas 90 deg off. but Ive heard that, when you have a 40 and a 20 on the same tower, the interaction is never dissipated by the 90 deg offset. Is that
I have run XM240's and 40-2CD's above my C3, TH7, SteppIR, 204BA and have never noticed any interaction on 20m. My stack distances have run between 10 and 15 ft. _____________________________________
Felipe, I have a Cushcraft D40 4 feet above a Force12 C3S tribander. The D40 is aligned parallel with the boom of the C3S. I have zero interaction between the two antennas. I called Force12 and asked
Makes sense. The interaction is normally between the 40 beam and 15. 73 bob de w9ge _______________________________________________ _______________________________________________ TowerTalk mailing l
I think 40 and 15 on the same tower is the problem. Chuck W5PR _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contest
I have modeled 20m and shortened 40m beam interaction and with my antennas and the interaction was very minimal when pointing the same direction and very noticeable when pointing 90 degrees apart. Th
Really? So no 90 deg off for that combination? May I ask how far where they apart? I guess is the right approach to then model the antennas exactly.. I liked this explanation from Bob... I have a Cus
Chuck is correct. A 40 and a 15 on the same tower/mast will definitely NOT work. We tried it once at W3GM's station. The 40M yagi worked fine but the 15 was pretty much useless due to the severe int
For an initial interaction study, you could work with a fairly simplistic model (i.e. you might not need tapers, and you certainly wouldn't need to model every bolt and nut). You run the model drivin
My 40 meter Cuscraft D40 is only 4 feet above the Force 12 C3S tribander. I could have explained it better, the D40 is 90 degrees off of the C3S, the D40 is in line with the boom of the C3S. I would
Really ? I have a KT-34XA, a KT-36XA and a KT-34A. All elements are insulated from the boom. You can get surprising interactions. For example, I have a 2 element wire beam on 80 meters, supported fr
Steve, You are correct, I had it backwards. The KLM antennas have the elements insulated from the boom, and Force 12 parasitic elements are connected to the boom. Thanks for pointing it out. Yeah, in
Anybody using a Steppir with Cushcraft 402CD? I have this combo with the Steppir at the bottom and the Cushcraft 12' above it. I had just one opportunity to mount these, as I had a short-term renta
Gale, In the same tower? I always assumed that 15-20 ft of separation would be enought even for the 15/40 combination. you are saying is not? What was the separation? I have a force 515x about 18 ft
When many of you say there is interaction between a 40 meter beam and a 15 meter beam no matter the separation, can you tell me what that means? How does it show interaction between the beams? Rick K