Thanks for the Net NM Calculator.
I had trouble downloading it and using it because its file had a php extension, but it was listed as an xls file in the attachment name. The solution was to change the file extension to xls, and it worked well for me.
I used line 7 for the balun loss.
One minor criticism; line 15 says Net NF. I think it would more correct to call it Net NM. Andy Lee calls it Net Residual Noise Margin.
Here is the System Noise Figure calculation.
I used the System Noise Figure calculator by holl_ands and majortom.
http://imageevent.com/holl_ands/file...=0&w=1&s=0&z=4