attenuation

Hey. I have a question about noise figure and attenuator. Lets assume we talk about 1Hz BW and the Thermal noise is -174dbm What happens if a signal with a power of -168dBm is going to a 10dB attenuator? is it possible to get below Thermal noise? and what happens if I put 50ohm at the input and...

Hi, Unsure if correct forum, please inform if not. I am trying to understand and determine the correct mathematical formula(s) to calculate overall attenuation loss through a COAX cable. I would like to be able to plug in cable information into a datasheet, and for it to determine the overall...