I'm trying to construct a BCB preselector to eliminate overload of my MFJ1026 by local transmitters. I'm currently using coils taken from discarded portable AM radios, but I would like better selectivity (higher circuit Q).
For example, using a series LC circuit peaked on 760khz, my pest on 1290khz is decreased by about 10-15db. That helps, but the pest can still be heard on some frequencies. A parallel trap using the same components set for 1290khz will cut it down about 25db, but the loss is devastating down on 760khz. Has anyone played around with spider wound or honeycomb wound coils with Litz wire in home construction?? I found this link on crystal sets that seems helpful: http://home.t-online.de/home/gollum/hcoils.htm Size really isn't important, but high Q with low loss is ! 73, John Wilke WB9UAI ---[Start Commercial]--------------------- World Radio TV Handbook 2003 is out! Order it now! http://www.amazon.com/exec/obidos/ASIN/0823059677/hardcoredxcom ---[End Commercial]----------------------- ________________________________________ Hard-Core-DX mailing list [EMAIL PROTECTED] http://www2.hard-core-dx.com/mailman/listinfo/hard-core-dx http://www.hard-core-dx.com/ _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://dsl.org/copyleft/dsl.txt
