All,

I'd have to agree with Bill. I had real issues decoding DP1POL on 2016-02-24 
around 0045Z - many of his JT9 transmissions that looked ok didn't decode, so I 
thought I was losing my mind.

--
David Tiller
Sr. Architect/Lead Consultant | CapTech
(804) 304-0638 | 
dtil...@captechconsulting.com<mailto:dtil...@captechconsulting.com>



On Feb 25, 2016, at 8:22 PM, Bill Somerville 
<g4...@classdesign.com<mailto:g4...@classdesign.com>> wrote:

On 26/02/2016 00:42, Michael Black wrote:

Here's a wav file with DP1POL at 2648 offset.
He decoded fine the minute before at -15 but this period no decode at
all on what looks like a clean signal.

So this isn't a "booming" JT9 signal but is an example of a few that
I've seen lately that didn't decode when it looks like they should.
It doesn't decode on re-opening it either like Bill saw.

https://www.dropbox.com/s/48w8hk0pelcnsvh/160226_0033.wav?dl=0

My settings are:
random erasures 6
Two-pass decoding
Aggressive 0
Degrade 0
bandwidth 2500

Hi Mike,

before I even look at that file I would comment that an Antarctica station is 
not a good candidate for JT9 as auroral phase distortion will degrade a JT9 
signal very easily. The random erasure, two-pass decoding and aggression level 
are all JT65 only parameters so not relevant.

The behaviour I reported was occasional string JT9 signals that did not decode 
live but always seemed to decode from the saved WAV file, a different 
presentation.

<ajjcbbgj.png>

Looking at the signal it is clearly not clean and I doubt the stripes of noise 
which are right across the band are helping either. It is hard to judge but the 
frequency stability doesn't look too good either.

73
Bill
G4WJS.
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