Quoting Brandon Jordan <bcdx....@gmail.com>: > > Hi Nick, > > What is the benefit from this system compared to the Wellbrook Phased > Array based on ALA-100 loops? > > > >> Just to let you know; Wellbrook has finally added a K9AY Phased Array to > >> their portfolio.
It is supposed to deliver better front to back nulls, Brandon; the Wellbrook website shows simulations of the directionality of both systems. The extra directivity makes sense as you're phasing two somewhat uni-directional antennas compared with phasing two bi-directional antennas. best wishes, Nick Here are some further details from Andy Ikin on the K9AY list this morning: >Several MW dxers have favourably compared the Wellbrook Phased Broadband Loop version of the array to an 800ft BoG. As the K9AY Array has a higher RDF than a phased loop array, then increased directivity is afforded. >The Arrays Phasing Controller can also phase Active Broadband Loops and Active Vertical/Active Dipole pairs. Hence, I have been able to make my own comparisons. In all the on-air tests on MW, the K9AY Array has a much wider rear null. For example, where reception of Newfoundland is unusable due adjacent channel splatter from Germany and Spain using either Phased Loops or Active Dipoles, much clearer reception of NL was had with the K9AY array! >There is one important feature; when using the K9AY or Active Vertical/Dipole Array; the susceptibility to locally radiated E-Field noise is much higher compared to the using a Phased Loop Array . I measured up to 20dB reduction in local noise using The Phased Loop Array. So it is important to deploy the K9AY array well away from local noise to appreciate the added benefit of the increase directivity. ********** Nick Hall-Patch Victoria, BC Canada _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com