Scott, I use 'fanned dipoles' fed with a common coax - yes a balun is highly recommended.
The secret to fanned dipoles is to get the ends as far apart as possible so they do not interact. Expect some interaction in any case, and tune them from the lowest band first. I have tried 5 bands - in a word, DON'T, unless you are willing to drive yourself crazy cutting and pruning due to the interaction. 3 bands is about my limit. One other point - do not try to combind bands that are close to the 3rd harmonic of the lower one on the same coax - that too will drive you crazy trying to tune them because the 3rd harminic frequency antenna will also present a low impedance feedpoint. In other words, stay away from combining 80 and 30 meters or 40 meter and 15 meters. I successfully use an 80/40 meter combination, a 20/15/10 combination and a 30/17/12 combination - 3 feedlines to cover 8 bands. Some are dipoles and others are inverted VEE. 73, Don W3FPR > -----Original Message----- > > Hi > This is a little off topic, but I don't know of a better place to > find someone that would know the answer to my question. > Many years ago I used one coax to feed three different inverted V > antennas all for different bands. At the time I thought they worked > just fine. Worked all kinds of dx with the setup. I have been told > lately that the unused antennas on the setup would pick up additional > noise. > Has anyone ever done any testing with multiple antennas on one > feedline to see if they really do pick up extra noise? > I'm thinking about putting up new inverted V antennas on 160, 80, and > 40 meters and feeding them with one coax. Sure beats antenna > switching and it always seem to me that the signal would go to the > resonate antenna. I always used a coaxial balun in the feedline. > Any ideas would be appreciated. > Thanks > Scott N5SM > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.441 / Virus Database: 268.18.2/692 - Release Date: > 2/18/2007 4:35 PM > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.2/692 - Release Date: 2/18/2007 4:35 PM _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
