My DirecTV receiver will die briefly during very heavy rain. I don't know what frequencies they're using, but it isn't a very big dish, so there probably isn't a lot of gain margin. Remember -- it's
"Big Bang" and Evolution are both based on the scientific method, and the latter has been quite well proven. Creation and Intelligent Design are both matters of faith. If the human race is to survive
Ron Steinberg, K9IKZ, was playing with several ideas for a reeler of some sort for an inverted vee supported from his crank-up. You might touch base with him to see what he ended up with. He hangs ou
I skimmed both the Power Point and the longer document. The analysis that went into the Power Point make it considerably more valuable in guestimating what might happen at VHF and low UHF, but neithe
Permeability for a ferrite is not a single number, it varies with frequency. AND, it is a complex number -- that is, there is a real part that describes the inductive component of its series equivale
I have also had some success using loading coils to electrically lengthen a dipole, both on 80 and 160. Barry, KU3X (HyPower Antenna Company) makes some nice loading coils that have worked quite well
It has also been observed that those unwilling to study history are doomed to repeat it. A similar observation could be made regarding a failure to use the scientific method. My own personal observat
There is also antenna directivity, which can be quite significant, even with relatively simple wires. For example, my 80/40 dipole at home runs east/west, so is pretty dead going west. But if I run i
First, please change the subject line when you change the topic. It's a real PITA to keep track of what to read. anyway!? It can't be determined from the limited data you've put in your email. Rememb
But you still haven't told us what the Z reading is at the low VSWR point, which will help us help you zero in on what's going on. :) Also, the variation in wavelength between 1680 and 1830 is only a
Unless Bob has done a short circuit or open circuit measurement of the length of the coax, he might not be correct about the wavelength of the coax. Maybe he has -- I haven't followed this thread lon
What Jim Lux has shown by cranking the numbers is that when the VSWR is small, the effect of the transmission line is small. That would be true whether the line was a half wave or not. But when it's
And for the antenna to work! That connection, and the wire that makes it, IS part of the antenna, whether you CALL it part of the antenna or not. That wire will radiate, just like any other wire carr
My philosophy is to try to get the main lobe as low as possible, because it has to go the greatest distance. Even if I manage to get the peak of the lobe down to 10 degrees, it's rather unlikely that
Different parts of the problem lie with senders and receivers and their email software. Tower Talk, and most email lists, use plain text, NOT html. When corresponding with an email list, your email s
I would say that you simply have pin 1 problems in the gear that is detecting the RF, and the antenna is now working well enough that it's putting out enough RF to excite them. This MAY be complicate
Sorry -- http://audiosystemsgroup.com/publish There's also a link from my qrz.com listing. Jim _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towe
If you think that's nice, check out "Google Earth," which is Google Maps on steroids! 3D, zoomable. Very nice, simple installation, free! Jim K9YC _______________________________________________ ____
side. Hello Eric, Greetings from PA3-land (s'Hertogenbosch) where I just finished an EMC lecture to the local AES chapter. Take a look at the antenna pix on my website http://audiosystemsgroup.com/K9
line? No problem at all -- in fact, it works quite well. I use 2-wire and 3-wire dipoles extensively. I use spacers cut from 1/2" PVC conduit that puts the dipoles about 7 inches apart. At W6BX, I ha