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I agree with everything you've said on all issues, except that deep nulls are not necessarily filled because feedline radiation does not necessarily occur. Low VSWR and feedlines dressed along metalic booms, masts and tower or mast supports often diminishes any radiation to insignificant levels. 73 Roy WA4DOU ------------------------------------------------------------------------- ------------------------------------------------------------------------- ----------------------------------------------------------------------- On Mon, 15 Jan 2001 14:58:21 EST AD6E@aol.com writes: > Not to run this thread into the ground, but a couple of comments ... > > 1. W9JCCs issue with 10 meter standing waves could be caused by > either leaky > coax or random wire type pick up from the antenna. Neither of these > are balun > issues. It's unlikely that a balun would work better on 15 than on > 10 unless > it somehow resonated near 10 which is unlikely (a coax coil could do > that if > you'r not careful). I fully suspect he has no real problem. > > 2. If an antenna has zero SWR, then there will be no standing waves > on the > coax with or without a balun. I've used various real world antennas > with no > balun and they work fine. The "unwanted" radiation from the coax is > NOT > necessarily a bad thing. Given a decent SWR in the first place, the > amount > of "undesired" radiation is not going to affect the antenna gain for > all > practical purposes. It only fills in the deep nulls a bit. If I > happen to > work a ZL off the back or side of the beam, its better than not > working him. > > That said, I'm still a proponent of using a balun of some sort since > its very > useful when the SWR gets a bit higher than optimal and the potential > for coax > radiation gets to be more than just minor (like operating 40 SSB > when the > antenna is tuned for CW). > > 73, > Al AD6E > > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, > Inc. > Force 12 Web site: http://www.qth.com/force12 > > Submissions: send to Force12Talk@qth.com > To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com > Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk > For problems with the list, contact n4zr@qth.com > > ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact n4zr@qth.com |