Is it possible, or has anyone tried, to modify the KSB2 to accept A narrower filter for SSB work, like the 1.8 KHz filters from INRAD? Or make it switchable, so you can vary the filter according to The band at the time, I could use a tighter filter quite often when working Some of the 40M nets, and when I make the jump to 20M. Just a thought. 73 John N5BSD ARRL NTS ORS NTX Digital Http://www.n5bsd.com