Hello Bill,
Many thanks, i'm very pleased. Haven't seen your grabber during the time
the signal appeared there, so thanks for the feedback.
A few days ago i built a better watchdog circuit so i can send DFCW-90
now which seem to look very nice on your grabber and takes just 40
minutes instead of the 60 minutes of the QRSS transmission.
The new coil is in use now! Signal improvement must be 3 dB, i.e. i
reduced the losses by 50%. But i also have to make a new primiry coil (2
or 3 turns on the glass, galvanically decoupled) and place some copper
plates above the lossy steel plates there to get some further loss
reduction. Anyway i am very happy with the new coil. It's resonance with
the antenna wire is arround 137.3 kHz and the variometer will be in the
shack again.
With the current system i cannot resonate at 136.172 kHz. The coupling
of the primary to the secondary coil is more loose, due to the lower
impedance of the secondary system. Thus the range the variometer can
resonate to is smaller. I will fix that on Tuesday. So i will stay
arround 137.7 kHz until tuesday evening.
Bill, maybe we'll have some luck to see something in your QRSS-10 window
:-) Would be great ;-)
Many thanks to the Ca/US stns for the grabbers over there.
73, Stefan/DK7FC
Am 12.11.2011 18:23, schrieb Bill de Carle:
Nice DFCW signal received in Ontario, Canada, early Saturday morning
0100 UT.
Stefan, we're looking forward to your next transmission with the new
coil!
http://www.magma.ca/~ve2iq/grabs/ta-dfcw.jpg
73,
Bill VE2IQ
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