I am trying to determine the maximum noise figure that I can have for my 1-16.5 GHz EMC receiver system which includes the horn, mixer for above 18 GHz, preamp, cable and spectrum analyzer. I know the following:
* Signal level received by the horn * Gain through the system * Noise figure from the horn to the spectrum analyzer * Noise floor of the spectrum analyzer I understand that noise figure is the ratio of the s/n of the input to the s/n of the output of the system, so if I need an output s/n of 6 dB and have a NF of 14 dB, I need a s/n input to the horn of 20 dB. So it appears that I have one missing piece of information - the input noise to the horn. Now I am lost. Suggestions? --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
