Topband: Input Impedance of the FT1000/S-Meter Calibration issues

[Richard Karlquist]

> impedance. Optimum receiver noise figure might not be at 1:1 match anyway,
> but none of it matters if you can clearly hear external noise.
> 
> 73 Tom

In fact, it can be shown that optimum noise figure NEVER
coincides with a matched condition for bipolar transistors.
The ratio of input impedance to source impedance must
be approximately equal to the square root of the transistor
current gain (beta) for common emitter.  For common base,
the ratio is the reciprocal of sqrt(beta).  

Like Tom says, it doesn't matter on 160 meters.

Rick N6RK