Mike,
I have been using the 130' Cobra Ultralite Senior Multiband doublet style antenna by < http://www.k1jek.com > for several years. I currently use it with my K2/100 and KAT100. The antenna comes with 100' of twinlead which I attach to a DX Engineering 10KW 4:1 balun (DXE-BAL-200-H11_C) at my window with a short run of RG 213/U coax to the K2/100 and KAT100 Autotuner. I tried using the Elecraft balun but it get very hot at 100W. The DX Engineering balun never gets even warm. The KAT100 indicates SWR match of 1:1 on most frequencies 160-10m with a maximum of 1.3:1 to 1.5:1 toward a band edge or two. My antenna is only 25' above ground suspended from and strung through pine trees. I routinely operate at 50W on all bands and have no trouble being heard. I have also used this arrangement with approximately 30' of the twin lead inside the house where I brought it in through an soffit board and looped it across the rafters to a closet ceiling, then down to the floor and under the closet door across my study along a wall over a wood floor to my desk. I did all of this passing through only wood and sheetrock and trying to maintain a distance of at least a foot from any other wiring. I did not worry about proximity to nails. The twin lead attached to the DXE Balun sitting on my desk with a 24" piece of coax to the K2. This worked extremely well with the lowest SWR's across the bands. I just rolled up the twin lead and left it in the closet when I was not using the antenna. I also detached the twin lead at the point of entry at the soffit when not in use and just left it rolled up at the base of the tree. My Ultralite survived the 130 mph winds of Katrina to a point. It was anchored at the center and ends to pine trees. It got a severe whipping. It was finally downed by a huge pine tree falling across it. It did not tear the antenna apart other than pulling loose at one of the end insulators. It still worked after I reattached the end connection. I cannot say enough good about this antenna. It is the K2 of radio antennas. You can put it up and literally forget about it. It is one tough customer. ----- Bill Strong WA5KPE Hattiesburg, MS K2/100 #4454 KAT100 -- View this message in context: http://www.nabble.com/K3-Multi-Band-antenna-thoughts-tp15996954p16030515.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
