Picked up a couple of these on ebay and have an extra I'm not using for sale. This little board is pretty incredible. It's a modulator board that allows for up to 300% positive peaks while keeping negative peaks under 95%. I am really impressed with performance of this thing... Not just does its make you LOUD...it also allows you to go above 100% mod without distortion of exceeding 100% negative pinch off of your modulated signal looking at it on a scope.
Like the Inovonics 222 you can taylor your positive peaks with precise assymetry control and the extra loudness you get from 100 to 125% is definatley noticeable. Just run audio into the board and hook up board your radio/transmitter. Pretty simple. The audio through this board is pretty transparent, so what kind of signal you put in is what you get out. You can read info about it hear. http://www.ebay.com/itm/Asymod-II-Hi-Fi-Asymmetrical-AM-Modulator-for-CB-HAM-Radio-Transmitter-/121724263831?hash=item1c5754dd97 I have an extra board for $95 obo...message me if interested. Comes complete with documentation. Newbie