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Re: VLF: 16K19A?

To: [email protected]
Subject: Re: VLF: 16K19A?
From: DK7FC <[email protected]>
Date: Sun, 26 Feb 2017 22:31:16 +0100
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...another point: I tried to understand as much as possible from http://abelian.org/ebnaut/results.shtml
16k is convincing.
What about 32K? No significant additional advantage or not practicable for normal PCs?
Also it would be interesting to see graphs for the message success rate
= f (Eb/No) for various list lengths. In my recent transmissions i'm
playing with the CRC value so that the optimum list length is in a range
of 100000. It would be interesting to see which difference a list length
of e.g. 200000 makes. In my transmission which is running right now,
going from CRC14 to CRC15 would mean a doubling (ish) of the list
length. The transmission time would just have been 6 minutes longer...
73, Stefan

Am 26.02.2017 22:16, schrieb DK7FC:
Hi Paul,

Why is there no mode called 16K19A? Would that combination make no sense? With messages longer than 12 characters i may come to a critical value for most EbNaut decoders, so i will need to switch to 8K19A. Switching from 8K21A to 16K21A has an advantage (using the same transmission time), as far as i understand...
73, Stefan

PS: Here i'm preparing for transmissions on lower frequencies again...





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