In comparing the SBA-104-1 noise blanker schematic to yours, it's not even close. Pete, wa2cwa On Sat, 15 Mar 2014 16:30:53 -0500 (CDT) pbrickey at verizon.net writes: > Hi, > I have had quite a few questions about this, so I thought I would > send out the schematic that is in my SB-303 manual. > It is attached. > 73's, > Peter >