On Mon, Oct 10, 2011 at 8:38 AM, ZR <z...@jeremy.mv.com> wrote: > Ive been using BN73-202 cores on 2 wire reversible Beverages in the > 500-900' range. They work fine down to 150KHz with surprisingly good > directivity on the LF BC stations as well as NDB's ... performance is good > thru 30M. > Even 20 shows directivity ... >
This is precisely my observation, using those same cores on my 580' bi-directional Beverage antenna transformers. 73 material works very well indeed from 150 kHz to 30 MHz. Rarely, my Beverages even are superior for receiving on 15 meters. On 40 meters--where I've been operating this summer--they beat my elevated 1/4λ vertical hands-down 99% of the time. 73 Mike www.w0btu.com _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK