The x6100 RF final is the exact same MOSFET as fitted to the icom 705… this is a well trodden and usually false assumption trodden path. I was one of the first people to significantly document the RF final issues in the x6100 and can tell you it is rated to far in excess of 10w. The issue is the case. The issue is the soldering of the MOSFET to the die. The issue is most people think the heat is dissipated via the back and it is not it is transferred via the middle H alloy heat sink to the top and bottom of the radio. The issue is the design is bad for air flow and 10w ft8 often boils the solder on the ?rear of the MOSFET and it starts to loose power so people drive it harder and harder till it goes. In this forum I documented multiple steps to remount and BOLT down the mosfet using graphene film. This will.. I repeat WILL prevent 99% of radios ever going wrong through heat transfer (or lack of it) . A fan on the case back will help yes of course but it is pathetically effective compared to taking heat from the correct place (the bottom). Xiegu dropped a ball on the mounting of the mosfet and that is the end of the story. Fix it or drive it at 5w and lower duty cycle to avoid issues.?
Greg did the ?? right thing limiting it to prevent an influx of complaints of broken radios?
Sorry but this topic of 5w/heat/fans and al manner of stupid claims and theories needs putting to bed guys.?
Cheers
M0RWV?
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On 24 Jan 2025, at 13:56, Randy K7RAN via groups.io <padawer@...> wrote:
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The reason is because FT8 as a general rule should only be safely run at 35-50% of a solid state transistor’s rated output.
