I found some strong intermod products from AM (medium wave) broadcast stations on and around 80m when using a large inverted L and low-pass L-network antenna tuner
Hi Steve, Regarding your post on AM broadcast stations producing intermod products. I have been have similar experience with my K2/100 on both 160 and 80m using and 250 ft center fed dipole that is fed with ladder line and using an L-network tuner allowing multi band operation. If I use my home brew T-match tuner the intermod is not detectable, but becomes a problem when the L-network tuner is put back in line. I downloaded articles form ARRL web site and found information on BCB High-Pass Filters. >From that information I was able to build a filter that would handle 100-150 watts RF and placed it in-line ahead of the K2/100. My results have been very rewarding and even gave added benefits, that allowed the KAT100 to work on frequencies that it would not work properly before. Placing an 50 ohm dummy load outside of the filter, shows the filter to be transparent at all frequencies above 160m. There are also High-Pass filters available commercially that allow you to TX thru them. 73 Kurt - K0ARO _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
