LF: EbNaut: Which data rate is possible in which bandwidth?

[DK7FC <selberdenken@posteo.de>]

Hi Paul, all,

Today i'm going to start my experiment on 2970 Hz in abt 17 km distance. 
I will record to my 32 GB USB stick for 2 days. The antenna is a 
vertical loop, 4 turns of up to 100 m^2 each and a sound card powered 
NPN preamp. The plan is to run the carriier on 2970 (still active :-) ) 
and then do a frequency shift to get a better proof that it is my 
signal. On the second day i like to run an EbNaut transmission. Maybe 3 
to 5 characters. But which symbol length is recommended? I don't knwo 
how to estimate it. Let's assume my signal is 3 dB SNR in 424 uHz. Which 
symbol length do you recommend if i want to decode the message savely?
73, Stefan