You can match both 160 and 80 with a single modified L-Network. It would have three components rather than just two. There would be no switching required moving from 160 to 80. But, youd likely need
Depends on the altitude of the aircraft. And, I suppose, the air speed. ;-) 73, Doug, W7KF http://www.w7kf.com <http://www.w7kf.com/> _______________________________________________ _________________
Whoa! Im on only my second cup of hot caffeinated beverage this morning and I encounter bloviate on TowerTalk. Had to look it up. Made me laugh right out loud. Gotta be worth an extra 3-DB.. 73, Doug
Heres a data point: I have used underground PVC conduit for many years with no water ingress. There are two runs, about 100 each. Both are 3 PVC, chemically welded and plowed into the ground by a spr
Losses in an inductor are related to both the Q of the inductor and the current flowing through it. Simplistically, one could think of it as: P(loss) = I^2 * R. So, given the same Q, in a high voltag
Doug, That was an excellent summary; very educational. Thats exactly the kind of information I came here hoping to find. Thank you for posting and I look forward to any updates that may come along. 7
Ive wound a bunch of inductors with 6 AWG and found this site to be helpful: http://www.66pacific.com/calculators/coil_calc.aspx <http://www.66pacific.com/calculators/coil_calc.aspx> 73, Doug, W7KF h
Theres also the Wes Hayward Dual Band L-Network idea: http://p1k.arrl.org/cgi-bin/topdf.cgi?id=70063&pub=qst <http://p1k.arrl.org/cgi-bin/topdf.cgi?id=70063&pub=qst> (June, 1977, QST) No relay or mot
Id expect those to be flux coupled RF transformers designed for use with terminated antennas. Think rhombic or vee beams or terminated dipoles. Any chance theyre actually 800 ohms on the load side? A
Voltage at dipole tips its a kind of interesting question. I was thinking of putting a dipole in a stand of aspen trees which I do NOT want to burn down. There is no way to route the wires to complet
Im running a Davis Instruments 6250 Vantage Vue Wireless Weather Station. The Sensors are located about 40 feet (obliquely) off the end of an 80 meter inverted-V. The Console is located about 70 feet
My solution (http://www.w7kf.com/Articles/Projects/LNetworkCoupler.html) was to use air variable capacitors, one for each circuit. Adjust them once and then consider them as fixed values. It seemed e
I am familiar with that research. The bottom line was that by spacing the feed points of each set of dipoles approximately 6 inches from each other *and* by spacing the ends of each of the shorter di
Maybe an 80 / 30 M. fan dipole? IOW, add a 30 meter Inverted-V to the 80 M. Inverted-V... 73, Doug http://www.w7kf.com _______________________________________________ ________________________________