The units designed with dual antennas and switching diodes to electronically
"rotate" the antenna are not specific to modulation type. They will work
equally as well on AM as they do on FM.

Jim




"Mattsson"
shared these priceless pearls of wisdom:


-
-Is there anything like this for a DIY project? I googled a bit and found a
-lot on automatic FM DF projects, but not for AM. It´s understandable that
-most people are interested in searching FM transmissions, especially those
-interested in finding noise sources and the like, but I´m just interested in
-spotting and plotting those planes up there! =)
-
-Any thoughts and suggestions appreciated, Ken
-

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com