I think in the old days, guys used to refer to long wire antennas meaning, any long antenna fed single ended against ground. Actually just any random length of wire that they considered long. I'm not
I wasn't going to jump on this one, because I knew Tom would squash it, but seems these harmonics need more amplification. The "other submitter" is one of the best experts around, and he gave you the
The XM240 reflector being insulated from the boom was a concern for me also, not only for static discharge due to lightning, but also for arcing, if someday I decide to shunt feed the tower. With the
Google search for "Understanding, Building and Using Baluns and Ununs by Jerry Sevick" turns up a bunch of sources, mostly fourth edition. Jerry _______________________________________________ See: h
For a fan dipole there is much coupling between the two wires, so making them different lengths doesn't really buy much in bandwidth. If you take one of the wires of your fan dipole and put it at rig
"Wave angle is determined by height, ground characteristics, and polarization of the antenna...." Tis true, tis true! I just jumped to a conclusion and assumed that when most people build this antenn
When I lived in central Florida, running HF mobile CW, I sometimes would have high rain static and other times not. When the static was there, it was always proportional to vehicle speed. I did exper
Tom asked: "Why doesn't the same moisture make the same noise level on similar antennas, instead of lower antennas being significantly quieter?" Well Tom, I have never thought about this much, but no
Thanks for a very clear explanation, David. This is starting to make a lot of sense, and explains different instances of precipitation static. For stationary towers, the electric field gradient acros
You definitely need surge protection on your home antennas, not necessarily for precipitation static, but for lightning strikes. It is probably an overkill for mobile antennas. I base that conclusion
Some mobile antennas have a loading coil at the base that DC grounds the antenna and provides a leakage path, other do not. All the radios I have seen do not provide a leakage path for charge on the
Cebik thinks these things use an 800 to 900 ohm terminating resistors and a 16:1 transmission line transformer. http://www.cebik.com/wire/wbfd.html I too would like the specific data on the B&W. I ha
One significant point about your inverted L antenna: Your tower is going to have a major effect on your antenna. I have not modeled your tower and antenna configuration, but from similar models, I wo
Now you have got it figured out. 6 dB agrees with my crude model. It also agrees with my "feeling" having used one of these once at a field day location. If you took a survey, I think you would get t
The way most people do it is to put a stainless steel shim between the zinc tower and the copper wire and clamp it. Polyphaser makes clamps that work like that. That said, doing it this way doesn't m
The ICE 303 should be using a gas filled surge suppressor, not an MOV. MOV's have high capacitance and are suitable for control lines, but not for RF lines. A typical MOV may have 350pf capacitance w
Will someone please fix the sun. Its leaking again and I'm really itchin' to use my new antenna. Jerry _______________________________________________ See: http://www.mscomputer.com for "Self Support
I'll bet the shipping is an over-reaction to the increased gas prices. I have an M15 mast from US Towers. The KSI ratings aren't published. I called them up and asked for the mast strength rating and
This is easy to test. Why don't you try it. It doesn't work for me. SOLDER-IT makes a paste they claim will allow you to solder to aluminum. That doesn't work either. Jerry, K4SAV ___________________
Sounds like you have a bad connection somewhere in the antenna or coax to the antenna. Probably some oxidation. Your amp is putting out enough voltage to clear the oxidation and "weld" a connection,