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LF: Re: AW: JT9-2 and JT9-5 mode application: shown S/N values

from [Rik Strobbe] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: LF: Re: AW: JT9-2 and JT9-5 mode application: shown S/N values
From: Rik Strobbe <[email protected]>
Date: Fri, 9 Nov 2018 21:14:06 +0000
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Thread-topic: AW: JT9-2 and JT9-5 mode application: shown S/N values

Hello Marco,


I had SlowJT9 running in JT9-2 mode and copied you, but had left the shack for some minutes:


2055 -11  0.0 1106 2  CQ DD7PC JN49         

I called you when I came back, but you probably switched back to JT9 ot FT8.

About could not save the settings: if you installed SlowJT9 in the  "Program files" folder  you have to run SlowJT9 with administartor rights in order to save the settings. Or you can install SlowJT9 in another folder (c:\SlowJT9).

Thank you for the feedback,

73, Rik  ON7YD - OR7T


Van: [email protected] <[email protected]> namens Marco Scholz <[email protected]>
Verzonden: vrijdag 9 november 2018 21:58
Aan: [email protected]; Rik Strobbe
Onderwerp: LF: AW: JT9-2 and JT9-5 mode application: shown S/N values
 

Hello Rik,

Software works fine for me (only minor things like could not save settings when closing prog). Tried on MF a JT-2 transmission without any issue.

Thanks for your effort.

 

Vy73

Marco

DD7PC

 

 

Von: [email protected] [mailto:[email protected]] Im Auftrag von Rik Strobbe
Gesendet: Freitag, 9. November 2018 19:46
An: [email protected]; [email protected]
Betreff: LF: JT9-2 and JT9-5 mode application: shown S/N values

 

Dear all,

 

just a short notice that the shown S/N values are those delivered by the JT9 decoder, not taking the audio conversion into account.

This means that the real S/N values are about 3dB lower (more negative) that shown for JT9-2 and 7dB for JT9-5.

I did some test this afternoon that comfirms this: for JT9(-1) and JT9-2 signal of the same amplitude and added to the same noise the shown S/N values  for the JT9-2 signal were in average 2.7dB higher that for the JT9(-1) signal.

Although the S/N values are "just numbers", what really matters is if the signal decodes or not, I will correct this in the next release.

​

73, Rik  ON7YD - OR7T

 



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