Re: Completed 50 Watt PA, but...

Dennis Rieger


I tried to operate my 50 watt PA on WSPR mode at full power. Both IRF510's failed. Hans reminded me that this amp is designed for CW with around 50% duty cycle. It is not designed to operate at 100% duty cycle in WSPR mode. Section 6.4 of the assembly manual (version 1.00k, page 49) discusses thermal considerations for this amp. Good thing it is easy to replace the IRF510's. 


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