Re: Completed 50 Watt PA, but...


Dennis Rieger
 

Mitchel,

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. 

Dennis
KK5DB

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