Dear Jim,
Thank you very much for the report and the screenshots and measurements.
Yes, this was my first slow hell transmission at all! Today i used the H
bridge the first time after reducing switching losses significantly. No
local EMC problems so far. I am about 8 dB below maximum power now. I
took an external power supply for testing which was the limit.
The H bridge is rather immune against mismatch (in contrast to the
class-E) so i thought it will survive a slow hell test. This slow hell
transmission was done at -6 dB below the QRSS transmissions. The PA is
still no linear mode PA, no AM part added so far. Anyway it works, due
to the comparator in the TX mixer...
Jim, hope to see hear you again soon! Remember our kite /p CW QSO in
January 2010.
I've built the loop on your design and the preamp, so we should
inaugurate that ;-)
73, Stefan/DK7FC
Am 10.08.2011 00:07, schrieb James Moritz:
PS... some Hell fom DK7FC - Stefan's signal was audible here at this
time, although probably a few more dB needed for a CW QSO.
Cheers, Jim Moritz
73 de M0BMU
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