[Elecraft] KPA500 efficiency

[Ignacy]

78% efficiency seems high. But your calculations assume that all the meters
are accurate.

KPA500 is rated at 500W in linear mode and is supposed to have an efficiency
around 50% at this level. At a higher drive the amp will be less linear but
at a higher efficiency.  At low power the efficiency increases  linearly
with output power. If about 50% with 500W then about 62% with 620W.   

A data sheet for Microsemi 1 KW module shows efficiency curves in Fig 19 at
www.freescale.com/files/rf_if/doc/data_sheet/MRFE6VP61K25H.pdf‎. About 65%
efficiency at 700W with IMD3<-40db.  Reaching 80% at 1.4 KW and IMD3>-28db.
The dissipation is about 370W at 700W level and 350 at the 1.4 KW level.
These numbers do not include losses in transformers and filters. 

Ignacy, NO9E

 



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