Hi Guy, Thanks for your generous comments (about generous-sized loops). In answer to your question, it's rarely necessary to null pest stations when chasing TP's in Puyallup, since almost all the west coast QRM (Vancouver, Seattle, California, etc.) is around 90 degrees separated from the usual TP bearing of 300 degrees. This is a lucky accident of geography, but I'll take it :-) The only time it's really necessary to carefully null a west coast pest is when you try for TP-DX on a frequency like 630, 720, 810, etc., where domestic stations share frequencies with TP's. Then it's very important to get the null as precise as possible. The situation is completely different when chasing DU's on the coast, however. Seattle and Portland were exactly on the back side of the figure-8 pattern PVC loops when chasing Australia and New Zealand during the Lincoln City trips, and there was no way to null the pests. It was necessary to tune the PVC loop (and Slider loopstick) repeatedly, to minimize splatter from the pests. Together, these two additional tuned circuits made a big difference in the results from the August 20-22 trip. 73, Gary In a message dated 9/8/2010 11:08:43 A.M. Pacific Daylight Time, [email protected] writes:
I can give a big "ditto" to Gary's comments. His large PVC loops are impressive and imposing! Only rural DXers can expect to use these monsters without the paranoia of who might be watching / frowning / disapproving. Nick, if you don't necessarily want to rotate such a large loop for nulling, but can make do with a fixed position, you could greatly lessen the visual impact. Support ropes attaching to two trees or buildings, plus two stakes to the ground, could tension spreaders that keep the loop's turns in alignment and elevated. A single E-W loop could inductively couple to ULRs for both DUs and TPs if you're willing to give up loop rotation for nulling. Gary, do you regularly null local pests when DXing with the giant air core loops, or does this take too much time during the short time frame of dawn enhancement when you're chasing foreign signals? Guy Atkins Puyallup, WA http://fivebelow.squarespace.com > Date: Wed, 8 Sep 2010 01:19:02 EDT > From: [email protected] > To: [email protected] > Subject: Re: [IRCA] Puyallup, WA Ultralight TP's for 9-7 > Message-ID: <[email protected]> > Content-Type: text/plain; charset="US-ASCII" > > Hi Nick, > > Before really considering one of these large PVC loops you may wish to give > fair warning to your wife and neighbors, since the fixture is certain to > become a permanent part of your back yard. Perhaps the reason why my sole > neighbor let his house go into foreclosure was because he wasn't thrilled > with the "scenery" across the fence :-) > > 73, Gary > > > > _______________________________________________ IRCA mailing list [email protected] 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: [email protected] _______________________________________________ IRCA mailing list [email protected] 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: [email protected]
