Hi Dick, hotly so Of course, we all know the world is both an insulator and flat. Ask him these questions..... 1.) If current can't flow in earth, then why do signals "reflect" off earth (and the dry
Hi Fred and Reid, Not necessarily. There is no electrical advantage to packing a ton of wire in a small space, unless the goal is a heater. So far as I know, no one has ever answered the simple quest
Hi Fred, I can't argue religion. Logbooks can't prove or disprove a ten dB difference in efficiency let alone a fraction of a dB, especially on ten meters where the world can be worked with a fractio
I don't know how this relates to 80 meters, but I have extensive 160 meter data taken during a series of tests morning after morning on 160 meters with VK3ZL and ZL2REX, and other DX stations. I hav
Hi George, This "radial stuff" goes on and on. Probably the main reason it continues is few of us like to do a lot work or spend a lot of money. Because of that, there is a tendency to look for that
Hi Kurt, One thing I learned about evaluating data is to take things to the limits and see what the changes are. of approach the same I'd wager that is exactly what is going on. The "telephone engine
Hi Alex, I used to install radio stations, two way communications systems, and CATV systems. We almost never had failures from lightning even with hundreds of sites, many of which suffered direct hit
LB mentioned inefficiency of elevated radials is related to the "unbalance" of current in radials. I disagree with that one statement. Radiation is not a major source of system loss, no matter what a
Carlos and all, is Does It works excellent up to 200 MHz, and starts to have ripple in SWR at 220 MHz. I do not consider it a "good switch" for 450 although you might get away with it for local conta
Hi Ted. A J-pole is not as ground independent as one might think or read. It is an end-fed 1/2 wl antenna , fed by a 1/4 wl stub. Because the end impedance of a 1/2 wl is not infinite, but rather som
Hi Eric, Respectfully Eric, it depends on how you "looked". The antenna doesn't work "bad", it just doesn't work the way most people or models predict. First the terms. The top 1/2 sticking straight
Hi Barry, Yes, there is a reason. The RCS-4 depends on the line impedance being low to insure isolation from port to port. Isolation from port would be poor when switching 600 ohms or so. I have prob
I'd rely on Mr. Faraday's expertise. Inside a metal cylinder, the electric field becomes zero. When the time-varying electric field is zero so is the time varying magnetic field. What that means is
Hi John and All, the shack, even if and the >cables are buried, you should put a suppressor at the base of the tower AND at the entrance to the >shack. A lot of this stuff is common sense in dressing
Hi Don, At broadcast stations, properly designed installations have lightning retarding loops in cables or feed wires whenever possible. The idea is to add a high common-mode series impedance, since
Hi Lane, ran dB PU! Those gain claims smell funny. (Sorry, couldn't resist the pun.) any That claim is ridiculous. Yagi's and quads with parasitic elements are very close to optimized arrays for gain
them & Amen! No reason to spend bigger bux for something that doesn't work as well. For lower bands you need more turns, but an air wound choke or current balun is the best way to go for higher freq
And that means what, other than he uses one? 73 Tom -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contes
Carlous, administrator The RCS-8V by far. It is connector power rating limited. I have used RCS-8V's to switch 10 kW when equipped with Teflon SO-239's. The N connector models handle less power than
Right on. I use coax choke baluns for everything, and don't worry at all about cold flow or anything else. I use RG-6 CATV cable, RG-8X, or PTFE coax (with a UV resistant jacket) where weight is a p