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 
> <[email protected]> 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,
> ---
> 73 de Marco, PY1ZRJ (former IK5BCU)
> <LngLUd05M1sCT9Pe.jpeg>
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