[Icom] IC756 SWR meter compared with FC902 or DAIWA CN101

[Adam Farson]

Hi George,

From the IC-756 block diagram:

A reflectometer located in the transmit signal path between the LPF output
and the autotuner input sends "Forward Power" and "Reflected Power" voltages
to the CPU, which calculates the difference between the actual load
impedance and 50+j0 ohms. The CPU, in turn, drives the SWR scale of the
meter.

If the autotuner is disengaged, an external reflectometer will read
approximately the same as the radio's SWR scale (assuming a short jumper
between the radio and the external meter). If the autotuner is engaged, the
radio's SWR scale will indicate the SWR at the LPF output (autotuner input),
whilst the external meter will read the SWR arising from the load connected
to the antenna socket.

Cheers for now, 73,
Adam VA7OJ/AB4OJ