Hi, I think, the idea is to match 50 ohm coax to a V-beam or rohmbic antenna which usually have pretty high impedance. However, they also have a lot of reactance, and I don't believe a balun really c
Hi again, At last, all four ravine and distance spanning ropes are in place. Over 500 feet in at least three directions seems possible, somewhat shorter (maybe 480 feet) in the leg running most close
Hi Jurgen, Seems to me it will depend upon the effective radiation resistance of your antenna. A rhombic wire antenna has a pretty high value, so the voltage on the line would be high, but the curren
Aloha to all on this 4th of July, Well, you guys were trying to frieghtn me, weren't you? All this talk of lower efficiency and losses in long wire antenna runs. And here I am now, as of yesterday, t
-stuff snipped Yes, when you get some answers, please post!! Also the antenna model programs give answers in dBi!! Of course, these are always high, because dBi is always a free space number (I think
Hi, IMO, the resonance will almost certainly go higher. Near the ground, you have coupled in much reactance from the ground, which pulls the resonance lower. When you go up the tower, you will loose
Aloha to all, Thanks to the remnants of hurricane Dolores, Kauai has been cut off from the trade winds and showers these last couple of days. So this morning, early, we got the West most rope out abo
Aloha and Thank you to Brian and all the others who responded with help and advice, Brian sent along exactly the needed "code" to get AO going to optimize the V's. So I spent lots of hours today fidd
Hi again to those interested in the topic; and again, thank you for your comments and advice. Ok, will stop optimizing for VSWR. Decided, since Lloyd Colvin's V's did so well at 584 foot legs, all sp
Aloha Herik, Unfortunately, Lloyd does not mention the height of his V's in his QST article. Lloyd's only comment about height is that both ends of each leg, apex and far end, "should be close to the
Hi again, Rus, But what about high swr situations? I was afraid of the close contact spacing in the RS relays. When running 1.5kW to my V-beams, can get some pretty high vswr in the feed system. For
Aloha Henry, The relay you want and need is at Surplus Sales of Nebraska. I just bought two of them for switching my four v-beams planned for setup this Summer. The perfect unit, ceramic bases, is an
Aloha Bill, Here in Hawaii, most homes come with "jalousie" windows. Each section is made up of five long, narrow panes of glass which tilt open/close. For me it is very easy: slit in the plastic scr
Loyd Colvin, in his 8/56 QST article, suggests leaving a small voltage on the relay coils. This to provide a bit of heat to drive the moisutre away. Wonder if it really works, I will try with my set
Amplifier Theory vs Transmission Line-Antenna System Theory I understand that the ARRL has dropped Walt Maxwell's, W2DU, materials from the new edition of the Antenna Book, and stopped printing "Refl
Aloha, I've had Paul's XMatch now for many months; am super pleased with it!! I also have, for my V-beams, planned for set-up as soon as the darn trade winds calm down -- up to 36 mph this afternoon
Aloha, Status of our ambitious project to duplicate a globe spanning V-beam array a la Lloyd Colvin's set up in Germany. He described it in QST for August 1956: four 584 foot wires, spaced every 45 d
Yes, I had half a papaya for breadfast this morning; have about 4 trees of papaya here in the yard. I always tell people the flavor is similar to the way a rose is scented. Some disagree. Anyway, doc
Aloha from Kauai, My US Tower, MA-550, on the fixture which allows it to rotate, survived Hurrican Iniki in the late Summer of 1992 out here. It was carrying an oversized antenna: a 4-element quad on
Hi, I read in Walt Maxwell's (W2DU) book, "Reflections" about his ferrite bead balun, a 1:1 current balun he claims will provide absolutely equal currents to each side of a dipole, or, I presume V-be