TNX Bill, now it all makes sense.
73 Ady
_____
From: Bill Somerville [mailto:[email protected]]
Sent: Thursday, July 13, 2017 7:18 PM
To: [email protected]
Subject: Re: [wsjt-devel] WSJT-X 1.8 rc1 r7843 - FT8 weak signal decoded
only on the RX freq
On 13/07/2017 17:10, Adrian Fabry wrote:
using here WSJT-X 1.8.0.rc1 r7843 on Windows XP /32 SP3
On the attached FT8 wav file is a weak tropo 6m signal. It decodes -21 dB
but only when RX freq is placed on the signal (about 1012 Hz).
If I change the RX freq up or down for example to 1036 Hz I get no decode
anymore.
Is there anything that favors the RX freq when decoding? (beside being the
first decode in case of multiple signals )
On r7865 I built today, it can't be decoded anymore regardless of the RX
freq.
No complain, the signal is really on the edge, I just wanted to share this
interesting case.
HI Ady,
Steve and Joe are fine tuning FT8, there are trade offs between speed and
depth. We have used the Rx frequency offset as a constraint to enable a
deeper search. That may not remain the case or may even become a user
option. As smarter decoding algorithms are tried the speed/depth trade off
must be reassessed for optimum performance.
73
Bill
G4WJS.
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