Re: [wsjt-devel] Exaggerated reports given to lower tone freqs

[Marco Calistri via wsjt-devel]

Il 17/10/21 19:03, Bill Somerville via wsjt-devel ha scritto:

On 17/10/2021 21:38, Marco Calistri via wsjt-devel wrote:

Il 17/10/21 17:31, Bill Somerville via wsjt-devel ha scritto:

On 17/10/2021 21:11, Marco Calistri via wsjt-devel wrote:

Il 17/10/21 16:52, Kevin McQuiggin (SFU) ha scritto:

Hi Marco:

Did you follow the steps to record a reference spectrum first?  You have to record a minute or so of noise in order for the program to be able to compute gain figures which are then used to flatten frequency response.  I am not sure what would happen if you activated reference spectrum without recording it first.  

Kevin

Sent from my iPad

On Oct 16, 2021, at 15:11, Marco Calistri via wsjt-devel <wsjt-devel@lists.sourceforge.net> wrote:

Il 16/10/21 17:30, Kevin McQuiggin via wsjt-devel ha scritto:

Hi All:

There is a pretty good article on the why and how of reference spectrum use by Bob KA1GT at http://www.bobatkins.com/radio/WSJTX_flatten.html.  His site is targeted primarily at EME and UHF-and-above users, but the information applies to use of the reference spectrum at HF as well.

73,

Kevin

Hi Kevin,

I found this topic very interesting.

I've followed the step by step described in the article by KA1GT but when I click on Ref Spec my WSJT-X crashes!

I'm using WSJT-X 2.5.0 on Linux openSUSE Tumbleweed.

Regards,

Yes Kevin!

For this reason I went disappointed:

I followed the step by step from the URL you shared here regarding how to create a reference spectrum and then I checked that a new refspec.dat was produced inside the folder, but it seems that something in such file is not appreciated by WSJT-X and it keep crashing until I renamed such file to refspec.old.

marco@localhost:~> find   ~/.local/share/WSJT-X/ -name "refspec*"  -exec ls -la {} \;
-rw-r--r-- 1 marco users 204045 16 ott 19.35 /home/marco/.local/share/WSJT-X/refspec.old

I don't know why, I know that in this way it works!

---
73 de Marco, PY1ZRJ (former IK5BCU)

Hi Marco,

send me (g4wjs <at> classdesign <dot> com) your refspec.dat file that causes a crash please?

73
Bill
G4WJS.

Hi Bill!

I'll do it!

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73 de Marco, PY1ZRJ (former IK5BCU)

Hi Marco,

your reference spectrum file works FB for me, I don't see any issues with it. Here is the plot of it from the Equalization Tools dialog:

73
Bill
G4WJS.

Thanks Bill!

But if I let it in the folder as refspec.dat my WSJT-X crashes. I have not the possibility to use this reference spectrum here.

---
73 de Marco, PY1ZRJ (former IK5BCU)

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