Hi Doug,
No, i wasn't really on air last night. Another PA problem.
There are a few possible reasons why the PA blows up. I am more and more
convinced that it comes from the drive stage. Late in the night i got
the idea that this poly switch fuse may become to warm. Since the
interruption can be a rather slow dynamic process (compared to a
standard fuse) the FETs may be driven not suitable. Another reason may
be the ferrite core that could become warm in operation.
I have to carefully monitor all these parameters during transmitting
which is not so easy in the mechanical arrangement.
Anyway i will be on air again tonite. Maybe it holds up for a full call ;-)
73, Stefan/DK7FC
PS: You can watch other grabbers to get the proof that i am actually
transmitting, e.g. the TF3HZ grabber which is half the way to the US.
Am 13.01.2012 11:36, schrieb Douglas D. Williams:
Monitored 136.172kHz last night. I barely got a trace of a signal of a
couple of screen captures. Not enough for an ID. If it is Stephan and
he is still running flea power, then even a trace is impressive.
http://dl.dropbox.com/u/33457409/136172Hz.jpg
Snow on the ground this morning. I'm off to work!
Snow on the ground this morning. I'm off to work!
Doug KB4OER EM86ui
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