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#18
October 11th 06, 11:49 PM
posted to rec.radio.amateur.homebrew
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effect of cascading LNAs
wrote in message oups.com... Can I know how did you get that number of 50Hz? Thanks. Boltzmans constant times temperature KT for any resistor at room temperature =-174 dBm/Hz. That's as good as you get without cryogenic cooling. Add 17 dBm to increase bandwidth from 1 Hz to 50 Hz = -157 dBM/Hz Add 3 more to get to MDS and it's -154 dBm, your signal level. W4ZCB |
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