Great work Mark. That will get me started for sure. My Si570 should be here today. Wayne, I think it's a good idea to double the contacts for higher power but I'm probably not going to have a power amp higher than 10 watts or so. 73 Dan -- KB9JLO https://sites.google.com/site/on30ng/ On Thu, Feb 6, 2014 at 5:52 AM, Mark G0MGX <mark.g0mgx@xxxxxxxxx> wrote: > Hi Team > > I've done a bit more work on the output filter switching using a 4028 > (which arrived today!). > > The wiki is updated: > > http://www.hfsignals.org/index.php/Final_Output_Filters > > Including a link to a simple sketch to try and illustrate how it works and > enable others to prototype the ideas as I have. > > There will be more on this topic from me.... > > Mark > G0MGX >