One important thing to note here is that Phil has avoided one of the lossy gotcha's in his matching for using 43' with 80/160 by using a large (4 inch OD) and expensive (30 smackers) #2 powdered iron toroid, Amidon's T400-A2. Don't try to short cut or cheep cut this step because you are only running 100 watts or QRP. It's the LOSS AVOIDED by using this toroid that is actually more important running 100 watts and even more important running QRP.
If one really wants to know why, you can get down and dirty in Jerry Sevick's book, where you will find most of the how-come's in chapter 9, and how he uses a T400-A2 in a bifilar winding that actually performs correctly at 160. See figure 9-6 and 9-G on pp. 60, 61 of "Understanding, Building, and Using Baluns and Ununs -- Theory and Practical Designs for the Experimenter", Jerry Sevick, W2FMI (SK), 2003, CQ Communications, Inc, Hicksville, New York. On Tue, Mar 22, 2011 at 12:51 PM, Julius Fazekas n2wn <[email protected]>wrote: > Hi Tom, > > Check out Phil's, AD5X, site: http://www.ad5x.com/articles.htm > > He has written a number of articles related to your questions. Good > information with plenty of "how to" ideas with locally found materials. > > Elecraft's Balun kit is also capable of 1:4 unun and will easily work with > any 100 watt rig. > > QST has had several items related to the ubiquitous 43' verticals that are > all the rage now. I see at least one person has mentioned radials, which > are > a must have to effectively use this antenna on 80-30. > > The K3's ATU is very effective, but keep in mind that you will be matching > the feedline and antenna as a unit, versus matching just the antenna. The > K3 > will most likely find a match most of the time, but you still could be > seriously mismatched at the antenna. It may work, it just won't work well. > > GL es 73, > Julius > > ----- > Julius Fazekas > N2WN > > Tennessee Contest Group > http://www.k4ro.net/tcg/index.html > > Tennessee QSO Party > http://www.tnqp.org/ > > Elecraft K2 #4455 > Elecraft K3/100 #366 > Elecraft K3/100 #1875 > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3-S9-43-Vertical-tp6193993p6197137.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
