On the band screen I have a "GEN " selection. It's not mentioned in the manual. When I select it it takes me to the 2 mhz range. What is this. 2nd question. When operating portable, usually doing a POTA activation the radio sometimes emits a high pitched beeping. I never think to look at the signal meter to see if it's an external signal, but I don't think it is because it's the identical sound every time. I'm wondering if it's a high temp alarm because I'm usually in the sun.