You're probably not going to do significantly better with a single vertical radiator than your 1/4 wave vertical. There might be some advantages to a half wave vertical, but I'd just feed it at the b
Whoops.. my antenna is at http://www.n3ox.net/projects/sixtyvert _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@conte
GND...It is >already a Director, the vertical part of this parasitic element is 75.45 ft and the sloping part is >64.7 ft... It's only half a director! Just like the driven element, current *must fl
Yes. The load and antenna impedance are such that the coil reactance goes up while the antenna reactance goes down in frequency. What you end up with is that the loading structures act more or less
the bearing, not to keep it from slipping >down. Not if it's a real thrust bearing! It would surprise me if a manufacturer made a "thrust bearing" that couldn't take the rated vertical load with the
Clever! Was it just capacitively coupled to the main radiator or bare wire or what? _______________________________________________ _______________________________________________ TowerTalk mailing
If you take W5DXP's suggestion to make a folded dipole out of ladder line, you can purchase copper clad steel ladder line... then you've got good insulation, the strength of copperweld, and an anten
Three turns of wire on one of those snap on cores (the rectangular cores that snap onto each other and come two to a pack) measures, inaccurately, on my MFJ-259 160m: 2+j25 80m: 14+j45 40m: 36+j60 2
Jim, I didn't mean to detract from the suggestion to look at your very good tutorial... that's excellent work and very useful. I just had measured the Radio Shack cores particularly (and they don't s
My guess is that the balun on the tuner has insufficient impedance. Even a "balanced" tuner relies on the balun to force current balance... and if it's not an a balun with extremely high common mode
That's certainly true... but the Palstar unit mentioned isn't one. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@con
If you have a current imbalance on open wire line, you have common mode current. Only in the perfectly balanced case (equal and opposite currents) is the line operating with differential mode curren
Thanks for keeping me honest ;-) It's easy to have nonzero common mode and equal and opposite differential mode currents with coax and two seperate sources... just make current flow on the shield wi
Why not add some 250 or 500pF doorknob caps that can be switched in in parallel with the current capacitors? The actual switches will take some care, but maybe some vacuum relays could be used for a
I went to college in Northern NY and I think the ice storm of '98 deposited about 3 inches of radial ice on everything that stayed in the air long enough to gather that much ... That would be 3200lb
Is it a base loaded vertical? The base of the coil is a low impedance point but the antenna side of the coil is high.... so proximity of even a good dielectric to the element in a short base loaded
While this is true, I think we should be supplying new hams with a more useful rule of thumb for a minimal radial system than "try anything, even NONE." Suggesting the laying of zero, one, or two ra
Why is this thread so binary? No one is telling anyone to stay off the air if they can't put down excellent radial systems, and of course, the handful of dB you get from going from 32 0.2 wavelength
Yep, my 60 footer kicks butt on 40m. Probably would with just a ground rod, too, You buy an HF2V and you put it over a ground rod and you're going to have a miserable signal. You put up a resonant i
Yes, you can do this to make balanced shielded line, but it doesn't buy you a whole lot. It has basically the same loss as a single coax run, which can be quite a lot if you're using open wire or wi