[Kenwood] TS930 SSB Umph

[Dr. Gerald N. Johnson, electrical engineer]

50% efficiency is good for a solid state PA.

One issue of power capability besides linearity getting worse at higher
power output is the size of the heat sink. The 930/940 may not have the
heat sink size as used in the FT1000, nor the RF feedback to correct for
the distortion at higher power.

Since 930/940 power supply meltdown leads to PA meltdown from excess
voltage, it should be clear that the power supply can't support excess
RF power output without a major redesign and probably a larger
transformer, better pass transistors and more pass transistor heat sink.
All for 1 or 2 dB is never worth the effort.

73, Jerry, K0CQ

-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.