Correction: Same parameters as used for the first message, i.e. both messages use

f = 17470.1000 Hz
Start time: 20.SEP.2018  19:30:00 UTC & 16:30:00 UTC (daily)
Symbol period: 10 s
Characters: 3
CRC bits: 19
Coding 16K21A
Antenna current: 1.2 A

73, Stefan


Am 20.09.2018 21:02, schrieb DK7FC:

VLF,

In addition to the message below, which has been transmitted 3 times already, i will start to transmit the same message into a later time slot, also using different parameters:

f = 17470.1000 Hz
Start time: 20.SEP.2018  19:30:00 UTC (daily)
Symbol period: 10 s
Characters: 3
CRC bits: 16
Coding 16K21A
Duration: 02:24 [hh:mm]
Antenna current: 1.2 A

73, Stefan

Am 17.09.2018 16:14, schrieb DK7FC:

Edgar, VLF,

After evaluating the latest 4 days of carrier transmissions it shows that the path from DL to VK7 is quite unstable, i.e. the phase is very dynamic.  When applying different frequency offsets, it seems that the best start time for a message attempt is 16:30 UTC these days. The SNR then peaks when applying a -40 uHz offset, attached. Something between 2...3 hours seems to be best. Currently 2 hours seem to give better results but 3 hours would be less dynamic.
Based on this data i'm trying:

f = 17470.1000 Hz
Start time: 17.SEP.2018  16:30:00 UTC (daily)
Symbol period: 10 s
Characters: 3
CRC bits: 19
Coding 16K21A
Duration: 02:32 [hh:mm]
Antenna current: 1.2 A

73, Stefan