You see a lot of books talking about characterizing the antennas and then designing a network for them. I have found that is is much easier to just use an adjustable phasing network and tune it until
I think you really wanted to direct this to the original questioner, Colin, but, you raise some extremely important points.. At 01:07 PM 9/10/2003 -0400, Roger D Johnson wrote: Hi Jim.... As you can
Exuse my unscientific anecdotal questions, but does this mean if I didn't care about F/B (I have RX loops for that), only TX gain, I could just feed my 1/8WL spaced verticals in phase? Is TX optimiza
At 05:10 PM 9/10/2003 -0400, Bryan Rambo wrote: I believe N0AX's statement to be true. Thanks Ward! A corollary: No amount of clever engineering in areas of element interaction, feed efficiency, tuni
Very nifty... Short elements minimize the mutual coupling, 50 ohm load resistors also help swamp the antenna Z, so that, in combination with the combiner (which would tend to put the reflected power
Front to Back (or Front to Rear) ratio is something that the SteppIR type beam will excel at. Also, the SteppIR concept allows you to free one of the parameters that otherwise you'd have to optimize:
At 07:28 PM 9/11/2003 +0000, Howard Klein wrote: Hi John, Right you are. I am out of town and forgot the exact boom picture. I know I was not very disturbed over the boom specs. I actually got my 2nd
be (using With the driven elements tied together? How much phase shift was there in the driven element currents? Can you send me the model file? _______________________________________________ See: h
At 10:37 AM 9/12/2003 -0400, Rex Lint wrote: john, I don't follow you. "One cannot dispute mathematics. Gain is a product of Boom Length." The boom length of a TH7 is 24 feet. The boom length of a C-
I assume that these bits of "fur" are near the top of the tower? They would fit in the general class of "static dissipators" having very small radii of curvature (compared to, say, the end of the ant
Install a connector on one end, hook up antenna analyzer, measure VSWR/reflection coefficient at frequency of interest... VSWR should be infinite (unless you just happen to have the "wrong" length)..
I believe the original poster had a bunch of short chunks, and might not have a whole 1/4 wavelength. Same thing works, though.. measure the Z looking into a mismatch, just you have to do more math
At 04:06 PM 9/23/2003 -0400, Bill Cotter wrote: Doug, I just had North American Galvanizers in Louisville run my 100ft of Rohn-45 (30yrs old) through the four dip tanks and the hot-dip galvanizing ta
What's the diameter of the wires in the mesh? One rule of thumb for surfaces is to use wires with circumference equal to the spacing, and make them, say, 0.1 wavelength apart, segmented appropriately
Regarding your EMI susceptible subwoofer... I assume it has no digital parts working at more than 9kHz clock speed, etc, so it''s not required to meet Part 15? (although, it's possible that any consu
doesn't particularly Since you're not paying, you could refer her to the yellow pages, etc. (Don't want her claiming you referred her to a "shill"...) It's a bunch o'bucks, and it's not necessarily
At 03:14 PM 9/29/2003 -0400, Stephen Reichlyn wrote: I've done a quick search of the Internet and can find almost no information about the effect of mounting an antenna (vertical) in near proximity t
In other words, the idea is to get from here to there as quickly, cheaply and effortlessly as possible. An admirable goal... then, if it doesn't work like you thought, you've got time to try somethin
How large and how durable? Party supply stores usually carry latex balloons that can inflate to around 3 ft in diameter but they're not all that durable. Weather/pilot balloons are available in sever