My sincere thanks to everyone who responded to my 2-meter transceiver + railroad scanner question. Lots of Kenwood TM-281 recommendations. I downloaded and read the TM-281A manual. I can see that if I have the AAR channels programmed into memory, then I can do memory scan for railroad activity and lock out channels picking up unwanted signals or noise. Follow-on question: For the TM-281A, if I'm doing a 2m band scan looking for ham activity, can I lock out a specific frequency that's picking up noise or an unwanted signal?