Very neat mechanical design... https://radioattic.com/item.htm?radio=1370019 If I were to guess, one turret might be for the low pass and the other for the high pass. Neato! 73 Eugene W2HX -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20210622/0382558a/attachment.html>