Al, Your summary of how yagis work is substantially correct. If you want to really understand and predict how antennas work, you need a lot more than "trigonometry". It's one of the most complicated
I've been using Flexweave (not sure of gauge) for a couple of years on a dipole. I had a failure after a wind storm where some tree branches had abraded the cable. I think this is a failure mode to w
My tree guy frowns when he sees antenna ropes through tree crotches. It can damage the tree. He would like to have it reseated every so often so the tree can heal. Much better, I think, to install a
I expect that using acid or abrasives to clean the wire would be more detrimental than any oxide! It would take away more copper. If you're worried about wire degradation, there's nothing you can do
Also don't use a staple gun! I had some eager friends at a local non-profit who took it on themselves to install CAT-5 Ethernet in the building using this method. A world of trouble at 100 Mbit/s...
These projects can be useful to show the XYL, when I need to spend a few $K on new toys: How much worse it could have been. 73 Martin AA6E _______________________________________________ ____________
And now, for something completely different... Reminiscent of ham tech before steel tower were common: http://www.makezine.com/blog/archive/2006/10/how_to_make_a_skylon_tower.html Note that the tower
Birds are adapted for long migrations, and they are not adapted for chimneys or tower masts. ICBMs aren't adapted for anything. We are adapted for emitting weird radio signals and writing witty email
There is snow and there is snow. (Ask a cross country skier.) Dry powder has lots of air in it, which gets partly compacted out after a while. Wet snow has liquid water mixed in, etc. Ken, There are
Interesting thread, and I've had the same feelings about this particular connector - I wanted a second one for a test setup. Granted that a big company can't stop everything to help one small end use
... Here, here! Put me down for the archive service, too. One of the comments I've been wanting to make (at the right time) to the League is that they might do a better job of utilizing their intelle
Barry, You need to go the web page that is given at the bottom of every list email. You have to discover your password, if you don't know it, and then log in. There are various options, including the
Try http://lists.contesting.com/mailman/listinfo/Amps There is no shortage of info and opinions there! 73 Martin AA6E _______________________________________________ _________________________________
You might find a way if you get a well-connected local lawyer. Don't rely on any legal advice you get from me or this list! 73 Martin AA6E _______________________________________________ ____________
More copper (and more surface area) for lightning protection are always better, like 4/0. I ran across an interesting commercial installation here: http://tinyurl.com/2v5sea . 73 Martin AA6E ________
Agreed. If you truly want +/- 5% RMS to save your tube filaments, (that's the critical thing) your typical cheap VOM does not measure RMS and is not too accurate at what it does measure. Fortunately,
Somebody was suggesting a nice long sloper. So I assume we were talking about the 175-yard band? Or was it the 525-foot band? :-) When I was new at this game 50 years ago, I went to a radio class at
Author: Martin Ewing - AA6E <aa6e@ewing.homedns.org>
Date: Sat, 17 Nov 2007 11:54:40 -0500
Could this be an RoHS problem? Not primed (tinned) for lead solder? What kinds of metal don't take solder? Inquiring minds want to know... ;-) If it's RoHS, it's the wave of the future and we have to
Author: Martin Ewing - AA6E <aa6e@ewing.homedns.org>
Date: Sat, 17 Nov 2007 15:48:25 -0500
"Reduction of Hazardous Substances" (RoHS) is a European initiative which requires manufacturers to use non-lead-bearing solder for commercial electronics devices, among other practices. You have to
Author: Martin Ewing - AA6E <aa6e@ewing.homedns.org>
Date: Wed, 21 Nov 2007 14:59:25 -0500
Interesting question. Kind of OT, of course. The generator would be outdoors and reasonably well grounded, right? I don't see a problem, any more than any of us might have with gas appliances or heat