Am 19.01.2017 22:54, schrieb Paul Nicholson:
Looks good Stefan. I'll be looking for your signals.
Is there already a visible peak? The ERP is 2.8 uW. The carrier is now
running since almost 6 hours. I'm curious! Also it is interesting that
you can find optimised settings relative to 8270 Hz. I don't yet
understand why it should make a difference to duplicate the stream and
get and apply the blanker from and to different filter settings on the
separate channels. Exiting stuff to experiment with.
BTW, it is always a bit strange to claim to do the first whatever
(records...), but a few years ago the computer technique was not as
developed to handle modes like 16K25A. So can we conclude that it was impossible
to manage a message transfer over several 100 km on the lower VLF (
< 10 kHz ) with such power levels?
The PC causes a lot of phase glitches which are corrected immediately
but one can see a noise spectrum at -20 dBc :-/ I just didn't find the
time to prepare a better setup during the last days but i'm already
working on it...