Are you measuring with the analyzer at the same exact point as the Bird? Andy _______________________________________________ _______________________________________________ TowerTalk mailing list To
NVIS implies low, and dipoles mounted that low can have quite a low feedpoint impedance. Using a folded dipole can help counteract that. People have used a low mounted folded dipole fed by coax, usi
Here are a few reasons I've seen for using a lower NVIS antenna: Yes, the antenna gain goes down so there is less signal. But there is also less noise and interference, and in many cases the noise dr
This is just my opinion, mind you ... But I would guess that both may have been used back then. Measurement accuracy was not so good in the 1950s that things were that precise anyway. Andy _________
I'm not saying this will help much, and there's a pretty good chance you know this already, but the "Bell System Technical Journal" contained huge amounts of stuff about almost anything AT&T did. I u
As a first approximation, the voltage (and the current) should both vary sinusoidally along the length of any straight thin antenna. The current approaches zero at the ends and maximum one quarter wa
I got the impression from the original question that these bumps were not seen before, since he said he does regular inspections. So it's possible they developed over time or due to some incident, an
Don't just save it ... READ IT! His paper is packed with very useful information, and he knows what he is writing about. Andy _______________________________________________ ________________________
A follow-up to a month-old inquiry ... I happened across a website that appears to be about AT&T's Long Lines department (http://long-lines.net), and it has a link for the Lawrenceville, NJ shortwave
You probably meant to write "greater than 1.0". I'm not aware of materials with dielectric constants less than 1.0. Andy _______________________________________________ _____________________________
Ersin Multicore (made in England) was a very nice solder for electronics, quite popular in its day, before RoHS came along. I don't know much about the 50-50 blend. It apparently makes the solder sol
I noticed recently that Elecraft tells you to ONLY use tin/lead solder on their kits. No lead-free solder. Andy _______________________________________________ _______________________________________
You can also find that book at: http://snulbug.mtview.ca.us/books/RadioAntennaEngineering/ along with the story behind scanning it, copyright issues, notes about the map, etc. Or, you can go to http
frequency inductance There's some truth to that, but one also might argue with it. IMO, there is benefit in knowing BOTH the low frequency inductance or capacitance, and the value at the frequency o
The article claims it was STS-8. And then there was Apollo 12. I wasn't aware that it happened to a Shuttle during launch too. I thought their launch rules since Apollo 12 pretty much made that "imp
There are still people (companies too) who support the theory that lightning strikes can be prevented by installing suitable devices to dissipate the charge before it can build up. I believe it is st
I think they are more commonly called "feeders." I thought that the most common lightning strike starts from the cloud and goes down, but some might go opposite. I've read that the feeder grows in s
I occasionally scan articles about lightning, but would never consider myself anything of an expert on it. And lots of what I've read, I've surely forgotten over time. It's not part of my main line o
I do also see the multiple strokes in the daytime too. I see your point, and I'm not claiming my observations are scientific or foolproof, but I have seen a distinct difference at the same time of d
In my web surfing, I've come across one (or more) website(s) that apparently showed every non-Amateur licensee when you give it a zip code, plotted on a Google map. Not just the broadcast stations.