Very impressive indeed. Pre-distortion will hopefully be made available as a
option for the K3 in the future.
That would be a superb option if it does become available.
What these results however do confirm is that pre-distortrion is worth
implimenting and that it does work very well.
With predistortion coming sooner or later to mainstream radios, higher PA
voltage for 100W is dead issue.
Ignacy
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With bias, 12V transistors are class B or AB, not C.
See http://flarc.net/eme-info/PDF/N1JEZ-2.pdf.
He describes an amp changed to Class B (very low bias for little heating).
Regular IMD3 -22db. After predistortion -55db. Plus extra db in additional
power power. All for a cost of feedback +
On 10/3/2015 10:14 AM, Ignacy wrote:
With predistortion coming sooner or later to mainstream radios, higher PA
voltage for 100W is dead issue.
Ignacy
Higher voltage PA and predistortion are completely separate items. Even
with predistortion, good engineering principles mean higher voltage
Brain yes I recall tubes and the multiple power supply requirements. I even
designed to a few. I also remember how rough it was to do mobile power supplies
where the HV came from either vibrators or dynamotors. Then it was transistors
and everything went to 13.85V. But transistor output tanks
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