[Moon-net] LNA 144 ATF54143? *DEHAYS Dominique* dominique.dehays at enac.fr /Mon May 29 01:54:20 CDT 2006/ * Previous message: [Moon-net] LNA 144 ATF54143? <005349.html> * Next message: [Moon-net] LNA 144 ATF54143? <005371.html> * *Messages sorted by:* [ date ] [ thread ] [ subject ] [ author ] ------------------------------------------------------------------------ With other words I agree totally on RL match on input side, does NOT coincide with optimum NF. Gm Peter , 1) It is possible to get good RL and good NF at the same time using feedback BUT feedback is detrimental for stability . The well known preamp by PA3BIY I think , manage to get both , but at the cost of questionnable stability. If one is lucky , he can use it without oscillations ( but you know Murphy?) 2) In our application ,iIt is not necessary at all to get good match , the only reason for it is to reduce gain error during NF measurement.( for more info abt gain error read DJ9BV article on NF measurements , F5VHX also wrote a nice one , but I don't know wether it is available on the net) 3) I think that panfi accuracy is not good enougth to get reliable measurement , the measurement error is higher than the expected NF. 73's Dom/F6DRO ------------------------------------------------------------------------ * Previous message: [Moon-net] LNA 144 ATF54143? <005349.html> * Next message: [Moon-net] LNA 144 ATF54143? <005371.html> * *Messages sorted by:* [ date ] [ thread ] [ subject ] [ author ] ------------------------------------------------------------------------ More information about the Moon-net mailing list