Wow, thank you to the several who have confirmed my dim memory, hi. I rcv'd both private and reflector responses, some in great detail, working it all out. -114 dBm ( or most accurately calculated by
And that stuff is very difficult to work with!! Very tough insulation, and the conductors are spaced very close together. Just try and strip the insulation neatly, hi. I have fought with it several
And, because half wave verticals have very INTENSE E fields at the base of the vertical, they still need LOTS of radials! As WWVH learned out here on Kauai. See: http://www.boulder.nist.gov/timefreq
Force 12 spec depends upon 100 feet of coax: Some years ago, Dave Leeson, now W6NL posted the explanation here on Tower Talk. The length of line creates a double tuned transformer which per theory do
Well, my kW Matchbox Manual has the brand new price of $124.50 printed directly on it. Of course, that was decades ago, hi. Have no idea what today's price might be. Mine works fine, by the way. Use
Go to "The Wireman", Press Jones, N8UG!! 73, Jim KH7M List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more. Also check out our self sup
You do not divide dB, you add or subtract them. dB's are logarithms or ratios of powers. Zero dB is equal to unity power ratio, or no change in power. A zero dB s/n means both are equal in power lev
Correction: dBs are logarithms OF ratios of power. Jim KH7M List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more. Also check out our sel
LONG Perhaps of interest to those into the mechanics of tower design. By a professor of mechanical/structural engineering: "The twin towers were designed by Leslie Robertson, structural engineer from
Hi again, For those interested, here is a link with much more/better info on the building design, construction, the "tube" explanation (I needed, hi) and many comments by other structrual engineers a
Yes, my F12 C4, 2 el/band beam (C3 plus 40 meter dipole) has a 3 dB beam about 90 degrees wide; this per the test data by K7LXC and N0AX, "HF Tribander Performance..", 1998. And I have found it to b
Hi, Follow this link to lots of photos of the installation of an MA-550 with base and all: http://www.karc.net/Activities/Photokh7m.htm Note that you MUST strap the ladder to the tower up near the t
I suspect part of the doubt by some stems from the coverage given in the past to the "crossed field antennas" . Not sure what has ever come of this device; a few were installed in Egypt; planned else
Aloha Jack, Thanks much for the link to your columns about the CFA status. Pretty much still stuck in limbo, I guess. Weird! Yes, it would be nice IF a very small and very efficient antenna for lower
Some one suggested: You will be dissapointed!! The E-field lines at the ends of the resonant elevated radials will couple strongly to earth at such a low height! The result will be that both xmit'd a
This series of information has been one of the great benefits of this reflector. Praise to those who are participating. Just wish I had the QTH to allow some of this info to become applied, hi. Have
The LP on top is certainly for lower frequencies. Appears the two lower ones are to be, possibly, "ganged". 73, Jim KH7M -- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@
Yes, that is the tuner I use daily. Not sure it is sold any more however. I think its' cost to build was just too high which resulted in a $1k or so selling price. However, I don't use it for twin l
My adaptation/realization of L.B.Cebik's (W4RNL) optimization of Link-Coupled Antenna Tuners, see: 1. Five part tutorial, http://www.cebik.com/link/link0.html 2. Updated discussion of one recently a
Hi, I have had one of these tuners for a few years now. Have not used it much at all, as I no longer have antennas suitable for 160 meters; now using my modified kW Matchbox to my doublet for 80 and