Characterization

Circuit: DDX-Commercial-7 Antenna: Small jumper cable attached 10m: 36 dB on WSJT-X audio meter, on quiet and also with nearby beacon on !!! 12m: 36 dB on audio meter, on quiet and also with nearby beacon on !!! 15m: 46 dB on audio meter on quiet, 65 dB with nearby beacon on - OK 20m: 44 dB on quiet, 65 dB with beacon on - OK 40m: 40 dB on quiet, 60 dB with beacon on - OK ...

Note: This HF LNA design is inspired by Charlie Morris ZL2CTM's prior work. The idea that a single-transistor-preamp with 10 dB gain is more than enough came from one of my senior friends (elmer). This LNA will be used in the RX path of the DDX Commercial series of transceivers soon! Simulation files: https://github.com/kholia/Gain-Blocks-LTspice/tree/main/HF-LNA Please always publish your simulation files ;)