Kele, In some countries south of the US border a few AM stations, where I have done some work, roof mounted AM antennas are used. Most of them are in the upper portion of the band around 1600 Khz. Ca
Joe, Regarding the common mode issue: Would a choke coil constructed of 30 inches of 2" PVC with RG8X or RG-58 provide sufficient isolation? What if the coax to the shack is tri-ax with the outer shi
Several items that appear in demand for the topbander are available for reasonable prices from Edmund Scientific's: The have a "Super Slinky" that is an "extra long version extending to over 10 meter
I think Mario's reasoning is supported the fact that a Collins 75-A4 with a stock 500hz mechanical filter and its feature of single conversion on the 160 meter band made it nearly impossible to beat
Earl, I doubt very much that a 6 foot balloon can lift 7 pounds of dead weight. If you can get hydrogen it is much cheaper with nearly twice as much lifting power for half the price. Here in the Virg
Mauri, I seems that HA0DU has about 40 ohms loss resistance and that if he started puting in radials (prefer elevated) that the loss resistance would go down, his SWR would go up, and the efficiency
A simple but effective way to terminate a beverage without a grounded termination is to place the termination resistor in series with the last 1/4 wave of wire. In fact the last quarter wave may be p
For years I have been beating the drum for the benefits associated with building a wire cage around a grounded tower as a convenient and more efficient method of obtaining an effective top band verti
I have resent the corrected address below. Sorry for the typo. Spell checkers aren't that good yet to fix botched web addresses but that, I bet is just around the corner. Season's Greetings Herb, KV4
I'd be very Ken, I do remember constantly blowing out the dial lamps in my rotor control box until I bypassed the leads to ground at the based of the tower. A better to solve that problem might be to
Tom, I can assure you that the setup was far from dead. I used it during the 60's on top band with super results from W0VXO in Minneapolis. (Not the best DX location in the world!) I even got to list
Joseph, I dug out an old Army Signal Corp training manual TM 666-608 and on page 128 they have a section on top loading. Figure 117 on page 129 (TM 666-121) recommends that the flat top consist of a
Tom, would the center wire fed be more like Radiax than conventional coax depending on the spacing of the the legs. I believe Radiax, with the slots cut in the coax, has openings much closer to a hal
Bill, I have not tried it yet but a folded 1/4 wave (1/8 wave of 300 ohm twin lead) should work as a non radiating termination to a classical beverage. I have tried the zig zag with acceptable result
I don't know if the snake antenna is used today at all but I would like some basic construction information. After Hurricane Lenny the local cable company is giving away long runs up to 400 feet (fig
At KV4FZ I replaced the long flattop with a folded back pair of wires designed to eliminate the high angle radiation component. The entire physical length of the folded portion is 61 feet with the ou