A common 50 Ohm input impedance amplifier design evaluation:
Wayne has used this design for RF amps in K3, KX3, KX2, and K2. And K2
post mixer amplifier. There are other examples out in the WWW. Some
combine AC feedback with DC biasing. For this example, feedback is AC
coupled for adjustment isolation.
An observation, many of the examples suggest 50 Ohm in/out gain of about
15dB. Several different bias selections on my bench resulted with about
15dB gain.
John KN5L
