Hi
Minto.
The signal must have been about 6 dB lower than yesterday. Still have
to go back to the old system, unfortunately. Difficult to do good
measurements here in the "shack" where all the stuff is floating either
on mains voltage or on 137 kHz or a mixture of that. Have a battery
supplied oscilloscope but anyway.
I didn't got more than that what you saw, no higher power was possible
even when running the SMPS at 320 VDC. Unfortunately now i saw what the
reason was/is: Some of the turns of the loading coil moved a bit and so
i was outside the resonance. Since the Q of the TX antenna is very
high, the power goes down quickly when beeing outside the resonance. I
haven't had the tuning-meter (U,I, phase) in line, and just tuned the
shack-internal variometer for a maximum signal.
After the unwanted fault and replacing the FET i had to find other
problems like a non conducting shunt resistor (current sensing). This
wasn't visible. For some reason the current limiting didn't work then.
A second loud BAAAAAAANG caused me to
let it be for this week!
Now two mains fuses here at QRL are OFF and i don't have the key to put
them in again.
Anyway, i'm in holiday for the next 2 weeks and they will be back in
when i am back and no one will remember that, hopefully, hi.
Actually all that stuff should be exchanges in a QSO :-) BTW how about
YOUR PA? :-)
73, Stefan/DK7FC
Now trying to bring the coil back to its previous L...
