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PGXL and efficiency
I use Expert 1.3k-fa and I am thinking of upgrading to PGXL. The reasons would be 1) full integration with SmartSDR and 2) full SO2R, and 3) higher duty cycle.
The materials for PGXL seem to promise 1500W with SWR up to 2:1. This means providing full power at both 25 and 100 Ohms. To provide 1500W at 100 or 25 Ohms, the amp must be capable of 3000W at 50 Ohm. Then with perfect SWR it would be inefficient at 1500W, with lots of heating. Reports of loud fan at full load seem to indicate lots of heat dissipation
So a question is whether PGXL provides 1500W at SWR of up to 2:1, as measured with power meter that compensates for higher SWR, or the output power with SWR of 2:1 is less and the amp just does not shut off.
I run 1.3k with antenna tuner. Minimal heating.
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