I agree with Kieth wholeheartedly. SWR on the feedline does NOT cause feedline radiation - ever.
The thing that causes feedline radiation is common mode currents - most commonly observed as current flowing on the outside of a coax line. Properly placed current baluns can eliminate common mode current, but should not change the SWR, 73, Don W3FPR > -----Original Message----- > > -----Original Message----- > Attempting to compensate for large mismatches with an ATU at the tx end > of the feeder may result in an apparently good match, but will in most > cases cause the feeder to radiate. > > Exceptions to this are when the feeder is of the balanced variety, eg. > open wire, where the feeder carries a 'balanced' standing wave as a > matter of course. > --------------------------- > > Actually I believe this is one of the great myths of amateur radio. > Standing waves on the feedline do not create feedline radiation. What > standing waves do is to increase the loss in the feedline. Open wire > feeder is used to reduce feedline loss. > > - Keith N1AS - > - K2 5411.ssb.100 - > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > 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: 7.5.446 / Virus Database: 268.18.5/706 - Release Date: > 2/28/2007 4:09 PM > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.5/706 - Release Date: 2/28/2007 4:09 PM _______________________________________________ Elecraft mailing list Post to: [email protected] 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
