Hi Stefan,
Well luckily most stuff for 136 is cheap, but it requires some()
work
You know what I think
about deadlines :-) so I’m not promising a deadline for my PA, but it is
definitely going to be finished (Variometer is probably the biggest
challenge).
Have a nice holliday, see (Speclab) you in two weeks.
I take it
your /p plans for tomorrow are off?
Regards,
Minto pa3bca
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...
