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4.1. MEffA overview
MEffA
TM
stands for Maximum Efficiency Algorithm.
For single tone modes (CW, RTTY), MEffA sets dynamic real time output device drain voltage and
current yielding maximum efficiency for output power in real time reducing heat dissipation for
efficiency up to 75%.
Up to 65% head dissipation reduction efficiency with excellent IMD characteristics for SSB.
5. Power derating with temperature increase
5.1. Power derating overview
APC regulates output power in case of difficulties in amplifier operation. When high VSWR is
detected, APC proportionately reduces output power to safe level allowing continued operation
When VSWR exceeds high limit, APC switches amp to STBY (RF input bypassed directly to output)
mode.
When APC detects increased heat sink temperature, it will reduce output power only if the MEffA
TM
system can't contain it within allowed limits; when the amplifier cools to a safe 60 degrees C, APC will
return amp back to full power
5.2. Reducing maximum voltage with temprature
The firmware constantly monitors Vdc levels on the LDMOS.
In case of very high temperatures the firmware will reduce power and with that heat
dissipation and protect the unit.
When the temperature returns to normal, the power levels are turned back up..3. Monitoring
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Index
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