A bad idea when the Slinky is steel. Helical wound copper wire antennas do work, for TB we used a wound vertical on a FG pole at H40TT. It was amazing to me that EZNEC will auto generate a helix wire
Don't connect elevated radials to on/in ground radials. There is a huge ground loss for 4ft high radials on 160m. 7ft is far better and 10 ft is pretty good. There are "W" shaped radial feeds with th
Another choice is to buy a cylinder, which is what most consumer/retail users now do in the US. The 150 ft^3 cylinders were going for around $180 empty pre covid. The specific cylinder can be refille
Having watched/been watched by the TARS aerostat radar off the coast of FL, I would think that the "balloon" shape that generates lift with wind would be the better choice for 160m verticals. Helikit
Somewhat related was my effort to produce a pair of 80m notches so CW and SSB could run 80m simultaneously on Field Day (separate antennas). While the CW guys would be ok with 20KHz BW, not so for th
Small signal, dry contact relays are made from different contact materials than power relays made for higher voltages and currents. Any fix that cleans them or removes the surface oxide that inhibits
Thanks for an interesting article. I did a little reverse engineering from the KYW 1934 "4 square" picture and commentary. A figure 8 pattern was the objective. It seems to have used 8 radials elevat
Carl E Smith obit at http://iagenweb.org/boards/wapello/obituaries/index.cgi?read=414496 Have to wonder if the computer still exists. Grant KZ1W On 3/30/2022 14:34, Pete Michaelis - N8TR wrote: About
I think the disc-cone is a close relative. There is one of these on the bow of the Iowa BB in Long Beach. During a tour by W6HB, I was told they would have 25+ full duplex TTY circuits open at one ti
My perspective as originally a "1" in Boston and now residing near Seattle, is the nickname "suffering sevens" is well applied to my friends here in the Pacific Northwest. Simply, for the PNW, distan
One of the HFTA arrival angle charts shows the very low angles EU - PNW on 80m. These are calculated values. One way to measure arrival angles is to real time compare S/N on a vertical vs a dipole. F
And there are more than two sides to that coin. 1. DXpedition site noise - a big risk factor with little that can be known (except for desert islands) or solved in advance . 2. Differences in noise a
The 34 ohms is the sum of Rr (antenna radiation Z over perfect ground) and Rg (ground R loss). Rr depends on the dimensions of the L plus a bit of wire loss. My guess is Rr is about 10 ohms less than
Sounds like a great project. Isn't the reality that conductors (radials) in or near lossy mediums (earth, even salt water) have loss? And that the near field extends beyond the 1/4wl of the radials?
My experience with two elevated resonant radials near (0.1 to 0.2 wavelengths) the tide line has been very positive during 4 DXpeditions. The coverage is almost 180 degrees in the direction of the sa