To: <towertalk@contesting.com> Hi Henry, Odd quarter wave lines actually "force" equal currents only at the output terminals of the line, not in the element itself. You might not want equal currents
The problem is often common mode currents on the TV antenna or CATV feedline, not the Ham antenna. me! Makes sense. me That's not true. The only thing high SWR does is change filter response and pow
would burn poorly of mode think Since I design PA's and matching systems I can shed some light on this. Tube type PA's or solid state PA's with adjustable networks. 1.) One reason I specify a maximu
Hi David, and Not totally in every case. Increased SWR can increase feedline loss, mostly by increasing current on the line (I^2 R loss). and One trip out and back is enough to solve our applications
soon. for the My gray primer tower blends in nice. using a tube Has No, but it is now. rods at Yes, I use them. No, they are not and can not act like torque arms to any useful extent. They flex easi
Hi, This is weird stuff. really really that Radiation from coax is mostly due to imperfections in current balance at the cable ends. Surprising as it seems, the inside of the shield ALWAYS has as muc
Hi Joe, When I went from four elevated radials to a "real" ground system in two separate tests, FS picked up about 5 dB. When WVNJ radio went from six elevated radials to 100 radials, they picked up
To: <towertalk@contesting.com> I think that is pretty poor advice, if given as written above. Amen. I can sit in the yard and watch and hear my tower's guy insulators arc and spark across the gaps wh
To: <towertalk@contesting.com> Virtually all transmitters use a meter that responds to peak envelope power. The Bird (and many other meters) responds to average envelope power. It is the average enve
To: <towertalk@contesting.com> Hi Dave, That has always been my understanding, that inductance is about the same if "width" and length is about the same and if the length is much greater than the wid
To: <towertalk@contesting.com> Hi Bob, It is very well known and well documented that time-varying current tends to move to the edges of a flat strip, causing a wide flat strip to have higher resista
To: <towertalk@contesting.com> The standard Bird 43 meter meter and slug has a published error of plus or minus 5% of full scale anywhere on the scale. (That's why a Bird often shows incorrect SWR re
To: <towertalk@contesting.com> Hi Dave, There's a few things below that are generally useful to towertalkians, since they apply to both lightning and RF. First, I appreciate the info. I e-mailed you
To: <towertalk@contesting.com> Hi Fred, No, my antenna suffered LESS noise when the spike was added. I think the electric field gradient at the 20 meter antenna element tips became less, because it w
To: <towertalk@contesting.com> Hi Bill, snip Why are you so sure? 73, Tom W8JI w8ji.tom@MCIONE.com -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Adm
To: <towertalk@contesting.com> Hi Lee, Sure. You can do that by making sure your antenna is the shortest thing on the block. Of course that may run contrary to the goal of having the biggest signal o
To: <towertalk@contesting.com> Grounded or ungrounded, it makes no difference for the "attraction". Nice logical theorem snipped out, love the plastic wrap idea. My neighbor uses a jug of saltwater f
To: <towertalk@contesting.com> Hi ho Steve, Let me repeat what I think you are saying: 1.) Commercial stations can't afford to be off the air for any amount of time. 2.) Commercial stations don't dis
To: <towertalk@contesting.com> Hi Steve, So far as I know, it is the purported purpose of using this device in a different application than it's original design use on an aircraft flying THROUGH the
To: <towertalk@contesting.com> Hi Bill, There might very well be no such expert, because lightning is so esoteric. Roy Lewallen would call this a "high-Q" thread, because it could ring on and on. Wes