Monday, August 23, 2010

20M SSB transceiver update: Exciter/LNA front-end module complete

2 watts PEP exciter and LNA/Driver and bandpass filter module
complete. Works quite well, the LNA is very quiet.

I am using a Norton type of feedback design with a discrete low-noise
NPN transistor (forget the name at the moment, but it is very small
and difficult to solder, NF<1 dB).

The TX pre-driver and driver consists of an AD8009 current feedback
op-amp driving an IRF510 N channel mosfet.