...sorry i just see that my frequency is 2970.000 Hz, not 2970.005 Hz as announced...

73, Stefan

Am 20.01.2017 14:53, schrieb DK7FC:

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...

73, Stefan