Thanks for the additional information, Gary. Can you make the following measurement for me on your SA and send the results ? Take a clean RF signal at around 10Mhz and measure the BW at -3dB and at -55dB using a few % RBW (say around 200Hz-500Hz) using "peak detect" and then a RBW of 10x that (say around (2Khz and 5Khz) using "peak detect". 73 Kees K5BCQ