[Elecraft] KPA500 fault at H44KW (no pwr high SWR)

wa9fvp repair at willcoele.com
Sun Nov 2 16:25:17 EST 2014


Hi fred,

The parameter is Rds(on),max  The IRFSL9N60A is .75 ohms at 9.2 amps and the
IPA50R399CP is .399 ohms at 9 amps.  Q4 and Q5 are in series with a 100 ohm
resistor and the diode so the difference in the R DS(on),max has little
effect.

Jack WA9FVP
Willco Electronics



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Jack WA9FVP

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