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Not having to insulate the RD's tab from ground is definitely a win.
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> the RD generates less heat per watt than the IRF510 Are you saying the RD is significantly more efficient? Do you have numbers? Or perhaps this is your way of pointing out that heat transfer from the die is somewhat slower for a given delta-T. > Less drive per watt out is good, 20 watts if you need it at 13.8V. I think you will have to do a significant redesign of the uBitx to get 20W out at 13.8v, starting with the transformer at T11. Considerably more involved than just swapping in some RD's. I can believe that less drive is needed, but I'm not sure how big a factor this is. I doubt it is terribly significant.? The uBitx final is limited in part by how much power is available from the driver stage,? but those who have tried swapping in RD's in the past have not seen much improvement. Has anybody done measurements of drive required for RD's vs IRF510's from 3.5 to 30mhz? The primary advantage of an IRF510 is that it doesn't cost $25 (with shipping) when you blow a pair. There are disadvantages, but they can be designed around. Jerry, KE7ER On Sun, Jan 3, 2021 at 02:47 PM, Slurm wrote:
Seems for continuous digital operation the RD might be preferred just for the fact that you can bolt it's tab directly to an aluminum radio's case,, giving a very large heat sink, add to that , the RD generates less heat per watt than the IRF510.? Those two things together seem important for digital operation and heat concerns in general. |
