Apologize for earlier half-done post. Spastic hit on send key. See http://www.fybush.com/sites/2005/site-051028.html for a Franklin and a nice article.
For 1530 kHz, that's a *pair* of two vertical halfwaves in phase. 50 kW gives 3545.89 mV/m for broadcasting purposes. Note the relative lack of neighbors, and therefore lack of 24 hour miscellaneous diodic signal demodulation, talking window screens, permanently lit florescent bulbs, etc. Note that this monster is not too far from 160m. Think big and put an only slightly downsized 160 version out in the salt shallows somewhere on the western side of Cheasapeake Bay. Without any controversy whatsoever as to ground induction losses (zero) EZNEC says this would put 13.6 dbi gain toward Europe at 3.1 degree takeoff. Order of magnitude: three element yagi. Just for comparison, if I drain Chesapeake Bay and fill it with concrete rubble and other urban debris (can do magical things in EZNEC) I get 5.0 dbi at 12.9 degrees. The full EZNEC preloaded table follows, filling Chesapeake Bay with other dirt, or turning it into a fresh water lake. These figures are *without* any ground field copper underneath, as it is not needed for a current sink and I have no data on what kind of field might actually be employed. Urban debris: 5.0 @ 12.9d (-5.0 dB from that angle takeoff over seawater) Sandy 4.8 @ 10.7d (-6.6) Rocky, poor 5.2 @ 10.6d (-6.2) Average 5.4 @ 9.0d (-6.8) Forest 5.7 @ 8.7d (-6.6) Marshy 6.1 @ 8.4d (-6.0) Rich pastoral 6.8 @ 8.1d (-5.8) Very rich 9.1 @ 7.1d (-3.8) Fresh water 8.4 @ 8.9d (-3.8) Salt water 13.6 @ 3.1d (0) One can dream. 73, Guy. On Fri, Sep 23, 2011 at 1:21 AM, Herb Schoenbohm <he...@vitelcom.net> wrote: > George, Are you familiar with the Franklyn antenna design? > Some broadcasters swear by them and claim a 3 db increase over a 1/4 > vertical radiator. > > Herb, KV4FZ > > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK