Hello Clemens,
Thanks for the corrections, I did struggle a bit to get sensible
results, but put it down to user error :) No worries! I have built a
new combiner transformer on 3 off 78 material stacked 2.4 inch OD
toroids, using 3 times the number of turns. It runs a LOT cooler even
with no fan. I have now ordered some pot cores, but had to go to
Mouser for the size / material I want to try. My e-mail says they
should land today. I want to try an auto transformer in the combiner
next. Comments welcome!
Sunday, May 21, 2017, 8:51:52 AM, you wrote:
> Hi Marco & Chris
> apologies for the delayed reply.
> There was indeed a typo.
> It should heave read 12.5Ohm because the amp is designed to work into
> a 50:4=12.5 Ohm load.
> Then there was another wrong entry:2000W instead of 1000 W as each 1kW amp
> has its
> own 1:4 transformer.
> And there is another problem which I have detected meanwhile:
> The program calculates only for 50Ohm primary Z not e.g. 12.5Ohm.
> One could circumvent this shortcoming by entering 250W instead of 1kW for
> calculating the
> correct flux density because 250W generate the same voltage over the primary
> winding at
> 50 Ohm as 1000W at 12.5Ohm.But then the other parameters are calculcated
> incorrectly.
> Maybe I'll contact the author if he can implement some
> changes/improvements in his tool.
> 73
> Clemens
> DL4RAJ
--
Best regards,
Chris mailto:[email protected]
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