The best example is GaAsFET preamp discussed elsewhere with NF=0.6 dB and -11
dBm compression point. You have to find so inefficient antenna to make it give
any sensible contribution to RX performance. I guess JA HF rig manufacturers
assume that hams are using indoor antennas when they produce RX with NF = 5 dB.
On the other hand, when you read a 4 dB recommendation for 160 m from a
distinguished amateur authority...
73 de Mario, S56A, N1YU
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