"Richard Harrison" wrote in message
...
Myron, W0PBV wrote:
"Is that low efficiency of 30-50% really true?"

No. The pi network would not be so popular were that true.

The efficiency of a Class B or Class C amplifier is higher than that and
the network by itself is very low loss. RF amplifiers typically have
efficiencies well above 50% because much of their source resistance is
of the lossless variety.

Best regards, Richard Harrison, KB5WZI


If the efficiency or loses were in 50% range, we would be "ungluing" the
components in the PI network at the 2 kW power levels. Can you picture 1 kW
being "lost" in the coil and capacitors?
Typical matching network or tuners in the transceivers have loss about 10%
when power output is measured with tuner in or out while maintaining same
input.
Amps with decent copper and quality caps should be less than 10% in loses.

Yuri, K3BU