Hi Eddy, The mod is very simple, and reactivates Passband Tuning in the Series II IC-751A (new logo, IF Shift, 1989 vintage). Here is the link: http://www.ab4oj.com/icom/751a_pbt.html Cheers for now, 73, Adam VA7OJ/AB4OJ Scanned for viruses by Blue Coat http://www.WinProxy.com/