Date   

Re: Weird "signal diagnostics" readings

jdow
 

That is a very good possibility. The AirSpy HF+ does not deliver anything approaching a calibrated constant level output. It almost always* runs an AGC system to optimize the input level to the A/D converter. Other systems do not. So they will behave quite differently and not have levels that can be related to each other.

{^_^}
* I understand there is a way to disable the AGC with a significant reduction in performance. I don't know that SDRSharp implements this as it's an off label use for the HF+.

On 20190124 14:19:18, Joe M. wrote:
Why do you think the AGC should be identical between the two?
I can see how within the same company it might be the same, but odds
of two different companies using the same values is not likely.
What you describe really sounds like varying interference
signal levels that are triggering/affecting the AGC.
Joe M.
On 1/24/2019 3:30 PM, Patrick wrote:
Hi buddies !

FYI :

<< I will run another test when the snowfalls stop >>
Weather conditions are getting better ! I just started my DX session
checking - as usual - my local LF beacon.

Tonight, though the combo SDRuno / RSPduo still shows exactly the same
value, the "Signal Disgnostics" tool reads 5 dB more than the last time
after 1 hour ! (15 dB less last time when I turned on the radio, 5 dB
more today, that's 20 dB discrepancy).

I really don't understand these variations and why one reading remains
very steady while the other one fluctuates that way, considering both
setup are supposed to be very accurate. When one combo gives 5 dB more,
the other one should also give 5 dB more, whatever the value is, right ?

Have a nice evening,
Pat


Re: Weird "signal diagnostics" readings

jdow
 

They have different built in analog filtering characteristics. Sp you are still comparing pickles and bandanas. There is probably a strong signal that is within the RF bandwidth of one of the devices and not the other.
{^_^}

On 20190124 12:30:36, Patrick wrote:
Hi buddies !
FYI :
<< I will run another test when the snowfalls stop >>
Weather conditions are getting better ! I just started my DX session checking - as usual - my local LF beacon.
Tonight, though the combo SDRuno / RSPduo still shows exactly the same value, the "Signal Disgnostics" tool reads 5 dB more than the last time after 1 hour ! (15 dB less last time when I turned on the radio, 5 dB more today, that's 20 dB discrepancy).
I really don't understand these variations and why one reading remains very steady while the other one fluctuates that way, considering both setup are supposed to be very accurate. When one combo gives 5 dB more, the other one should also give 5 dB more, whatever the value is, right ?
Have a nice evening,
Pat
Le mer. 23 janv. 2019 à 18:57, Kenneth Sejkora via Groups.Io <quickhatch44=yahoo.com@groups.io <mailto:yahoo.com@groups.io>> a écrit :
I can attest to this 'phenomenon'.  I use an RTL-SDR V3 dongle with SDRSharp
in direct sampling mode to listen to 20-meters and other frequencies in the
HF band.  I live between Boston and Providence, so there are plenty of AM
transmitters in the vicinity.  After about 18:00 local time, and up until
about 07:00 local, the spectrum displays some minor phantom signals about
every 60 kHz apart.  However, during daylight hours, there are strong
signals every 10.0 kHz apart on exactly 10-kHz multiples... 14,100.0,
14,110.0, 14,120,0, etc., several of which exhibit audible audio
intermodulation with bandwidths up to 4 khz wide, like listening to a AM
broadcast..  Same thing if I drop down to 75-meters... 3,800.0, 3810.0,
3820.0, etc.  No, I do not have any kind of AM broadcast high-pass or
band-stop filter installed.  But once it starts getting dark, somewhere
between about 17:30 and 18:30 local, those 10.0-kHz interval signals
disappear.  I suspect it's a combination of both higher daytime power and
different antenna patterns, as almost all of the AM broadcasters in the area
exercise both practices of diurnal/nocturnal power and antenna patterns changes.
I did consider the possibility of temperature-related phenomena, such as
joints/junctions in wires, fences, rain gutters, etc. being heated up by the
sun and forming a pseudo-diode junction that radiated RF, but with recent
single-digit daytime temps, the pattern looks the same as it does on warmer
days.
Of course, your mileage may vary depending on the number of AM BCB stations,
transmit power, frequencies, antenna patterns, etc. in your local vicinity. I've been considering buying and trying an AM band-stop filter to see if it
helps.  I'd welcome any experiences, successes, or failures anyone has had
with such band-stop filters.
Good luck!
Ken, WBØOCV Norton, MA USA
41.959546N, 71.163996W  FN41kx
On Wednesday, January 23, 2019, 08:05:28 AM EST, jdow <jdow@earthlink.net
<mailto:jdow@earthlink.net>> wrote:
Dumb question - what time of day was this and what time of day do you usually
use it? At least in the states most broadcast stations run with different day
and night power and antenna patterns. And noise and signals do show a daily
pattern even on LF, at least around here in the past.
{o.o}


Re: Weird "signal diagnostics" readings

Joe M.
 

Why do you think the AGC should be identical between the two?

I can see how within the same company it might be the same, but odds
of two different companies using the same values is not likely.

What you describe really sounds like varying interference
signal levels that are triggering/affecting the AGC.

Joe M.

On 1/24/2019 3:30 PM, Patrick wrote:
Hi buddies !

FYI :

<< I will run another test when the snowfalls stop >>
Weather conditions are getting better ! I just started my DX session
checking - as usual - my local LF beacon.

Tonight, though the combo SDRuno / RSPduo still shows exactly the same
value, the "Signal Disgnostics" tool reads 5 dB more than the last time
after 1 hour ! (15 dB less last time when I turned on the radio, 5 dB
more today, that's 20 dB discrepancy).

I really don't understand these variations and why one reading remains
very steady while the other one fluctuates that way, considering both
setup are supposed to be very accurate. When one combo gives 5 dB more,
the other one should also give 5 dB more, whatever the value is, right ?

Have a nice evening,
Pat


Re: Weird "signal diagnostics" readings

Patrick
 

Hi buddies !

FYI :

<< I will run another test when the snowfalls stop >>
Weather conditions are getting better ! I just started my DX session checking - as usual - my local LF beacon.

Tonight, though the combo SDRuno / RSPduo still shows exactly the same value, the "Signal Disgnostics" tool reads 5 dB more than the last time after 1 hour ! (15 dB less last time when I turned on the radio, 5 dB more today, that's 20 dB discrepancy).

I really don't understand these variations and why one reading remains very steady while the other one fluctuates that way, considering both setup are supposed to be very accurate. When one combo gives 5 dB more, the other one should also give 5 dB more, whatever the value is, right ?

Have a nice evening,
Pat




Le mer. 23 janv. 2019 à 18:57, Kenneth Sejkora via Groups.Io <quickhatch44=yahoo.com@groups.io> a écrit :
I can attest to this 'phenomenon'.  I use an RTL-SDR V3 dongle with SDRSharp in direct sampling mode to listen to 20-meters and other frequencies in the HF band.  I live between Boston and Providence, so there are plenty of AM transmitters in the vicinity.  After about 18:00 local time, and up until about 07:00 local, the spectrum displays some minor phantom signals about every 60 kHz apart.  However, during daylight hours, there are strong signals every 10.0 kHz apart on exactly 10-kHz multiples... 14,100.0, 14,110.0, 14,120,0, etc., several of which exhibit audible audio intermodulation with bandwidths up to 4 khz wide, like listening to a AM broadcast..  Same thing if I drop down to 75-meters... 3,800.0, 3810.0, 3820.0, etc.  No, I do not have any kind of AM broadcast high-pass or band-stop filter installed.  But once it starts getting dark, somewhere between about 17:30 and 18:30 local, those 10.0-kHz interval signals disappear.  I suspect it's a combination of both higher daytime power and different antenna patterns, as almost all of the AM broadcasters in the area exercise both practices of diurnal/nocturnal power and antenna patterns changes.

I did consider the possibility of temperature-related phenomena, such as joints/junctions in wires, fences, rain gutters, etc. being heated up by the sun and forming a pseudo-diode junction that radiated RF, but with recent single-digit daytime temps, the pattern looks the same as it does on warmer days.

Of course, your mileage may vary depending on the number of AM BCB stations, transmit power, frequencies, antenna patterns, etc. in your local vicinity.  I've been considering buying and trying an AM band-stop filter to see if it helps.  I'd welcome any experiences, successes, or failures anyone has had with such band-stop filters.

Good luck!

Ken, WBØOCV Norton, MA USA
41.959546N, 71.163996W  FN41kx


On Wednesday, January 23, 2019, 08:05:28 AM EST, jdow <jdow@...> wrote:


Dumb question - what time of day was this and what time of day do you usually
use it? At least in the states most broadcast stations run with different day
and night power and antenna patterns. And noise and signals do show a daily
pattern even on LF, at least around here in the past.

{o.o}



Re: Airspy mini scanning software #sdrsharp #software

Mike M <Mike@...>
 

Hello
Thank you for the information it's much appreciated :-)
 
73s
 
Mike 2E0UMF


Re: Multiple SDR# instances running concurrently

EB4APL
 

Hi Joanna,

This is approximately what I do, but something like profiles (or support for multiple configuration files, like in the Spyserver) would make it very easy, only one program folder to maintain. Just an idea that could be added to the "to do" list.

73 de Ignacio, EB4APL




El 24/01/2019 a las 0:09, jdow escribió:
Setup}
    Load in SDRSharp to its own folder.

    Right click on SDRSharp.exe and select Create shortcut.

    Copy the shortcut to your 12 folders.

    For each folder: (Painful part)

        Right click and select properties.

        Edit the "Start in:" to show the folder name containing the shortcut.

    DONE

Update:
    Load in the new SDRSharp,

    DONE

Now you PROBABLY could create an intermediate folder "...\SDRSharp". Load each version in to its own folder, "...\SDRSharp1670". Create the shortcut. Copy the shortcut for the version you want to run into "...\SDRSharp". Then you could check earlier versions when a new version shows some peculiar behavior.

{^_^}

On 20190123 07:37:56, EB4APL wrote:
Hi,

I currently run several instances of SDR# and I have multiple copies of
the program folder which only differs in the configuration files, which
are tailored for different receivers.

While I think that I did my homework, I didn't found a trick for using
different profiles and only a program folder, such the one used with
Spyserver. While I tried the same schema, it did not work. Is it
possible to do it now or maybe something planned for the future?. This
way updating the program only in one folder is much better than doing it
in more than my current 12 copies.

Best regards,

Ignacio, EB4APL



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Re: Airspy mini scanning software #sdrsharp #software

EB4APL
 

Frequency Manager and ScannerSuite by Jeff Knapp is a very good solution. It is a plugin for SDR# that has a database and a scanner that can scan by frequency range or by groups of frequencies stored in the database. It is referred in the download section of the SDR# site. It can be downloaded from here: http://www.freqmgrsuite.com/

73 de Ignacio, EB4APL


El 23/01/2019 a las 18:02, Mike M escribió:
Hello
has anybody found suitable software for scanning frequencies or a list of channels?

Here is a little information about me :-)

https://siliconhell.com/paralysed-using-an-amateur-radio
Many Thanks

Mike
---
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https://www.avast.com/antivirus


Re: Multiple SDR# instances running concurrently

jdow
 

On 20190123 15:09:07, jdow wrote:
Setup}
    Load in SDRSharp to its own folder.
    Right click on SDRSharp.exe and select Create shortcut.
    Copy the shortcut to your 12 folders.
    For each folder: (Painful part)
Hm, you might need to do this for the DLLs you need, too.


        Right click and select properties.
        Edit the "Start in:" to show the folder name containing the shortcut.
    DONE
Update:
    Load in the new SDRSharp,
    DONE
Now you PROBABLY could create an intermediate folder "...\SDRSharp". Load each version in to its own folder, "...\SDRSharp1670". Create the shortcut. Copy the shortcut for the version you want to run into "...\SDRSharp". Then you could check earlier versions when a new version shows some peculiar behavior.
{^_^}
It would be easier if Youssef and crew taught SDRSharp to read the commandline to get the name of the config file to be used.

{o.o}


Re: Weird "signal diagnostics" readings

jdow
 

The filters are not going to hurt nearly as much as they help.
{o.o}

On 20190123 08:03:30, Kenneth Sejkora via Groups.Io wrote:
I can attest to this 'phenomenon'.  I use an RTL-SDR V3 dongle with SDRSharp in direct sampling mode to listen to 20-meters and other frequencies in the HF band.  I live between Boston and Providence, so there are plenty of AM transmitters in the vicinity.  After about 18:00 local time, and up until about 07:00 local, the spectrum displays some minor phantom signals about every 60 kHz apart.  However, during daylight hours, there are strong signals every 10.0 kHz apart on exactly 10-kHz multiples... 14,100.0, 14,110.0, 14,120,0, etc., several of which exhibit audible audio intermodulation with bandwidths up to 4 khz wide, like listening to a AM broadcast..  Same thing if I drop down to 75-meters... 3,800.0, 3810.0, 3820.0, etc.  No, I do not have any kind of AM broadcast high-pass or band-stop filter installed.  But once it starts getting dark, somewhere between about 17:30 and 18:30 local, those 10.0-kHz interval signals disappear.  I suspect it's a combination of both higher daytime power and different antenna patterns, as almost all of the AM broadcasters in the area exercise both practices of diurnal/nocturnal power and antenna patterns changes.
I did consider the possibility of temperature-related phenomena, such as joints/junctions in wires, fences, rain gutters, etc. being heated up by the sun and forming a pseudo-diode junction that radiated RF, but with recent single-digit daytime temps, the pattern looks the same as it does on warmer days.
Of course, your mileage may vary depending on the number of AM BCB stations, transmit power, frequencies, antenna patterns, etc. in your local vicinity. I've been considering buying and trying an AM band-stop filter to see if it helps.  I'd welcome any experiences, successes, or failures anyone has had with such band-stop filters.
Good luck!
Ken, WBØOCV Norton, MA USA
41.959546N, 71.163996W  FN41kx
On Wednesday, January 23, 2019, 08:05:28 AM EST, jdow <jdow@earthlink.net> wrote:
Dumb question - what time of day was this and what time of day do you usually
use it? At least in the states most broadcast stations run with different day
and night power and antenna patterns. And noise and signals do show a daily
pattern even on LF, at least around here in the past.
{o.o}


Re: Multiple SDR# instances running concurrently

jdow
 

Setup}
Load in SDRSharp to its own folder.

Right click on SDRSharp.exe and select Create shortcut.

Copy the shortcut to your 12 folders.

For each folder: (Painful part)

Right click and select properties.

Edit the "Start in:" to show the folder name containing the shortcut.

DONE

Update:
Load in the new SDRSharp,

DONE

Now you PROBABLY could create an intermediate folder "...\SDRSharp". Load each version in to its own folder, "...\SDRSharp1670". Create the shortcut. Copy the shortcut for the version you want to run into "...\SDRSharp". Then you could check earlier versions when a new version shows some peculiar behavior.

{^_^}

On 20190123 07:37:56, EB4APL wrote:
Hi,
I currently run several instances of SDR# and I have multiple copies of
the program folder which only differs in the configuration files, which
are tailored for different receivers.
While I think that I did my homework, I didn't found a trick for using
different profiles and only a program folder, such the one used with
Spyserver. While I tried the same schema, it did not work. Is it
possible to do it now or maybe something planned for the future?. This
way updating the program only in one folder is much better than doing it
in more than my current 12 copies.
Best regards,
Ignacio, EB4APL
---
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Re: Weird "signal diagnostics" readings

jdow
 

Hypothetically speaking you could have made a settings change while operating the last time that was not reinitialized when the program started the next time. I'd be surprised. One thing to do in situations like that is to shut down the program, power cycle the dongle, and restart the program to see if anything changes. At any rate learning how to make this happen repeatedly would allow Youssef and crew to effect any SW changes needed or isolate any HW problem that might exist.

{^_^}

On 20190123 07:29:34, Patrick wrote:
Hi !
Thanks for the replies and comments.
<< In any case, you can trust what the signal diagnostics plugin says it's not "just for display >>
That's the reason why I was so surprised with the reading ! I know this tool is very reliable and I often use it.
<< Lower ambient noise? Some neighbor is on vacation or changed his noisy TV? >>
RSPduo / SDRuno should have also shown lower values in such a case, but they were the usual ones, as specified in my first post (signal strength for this beacon has been the same, within a dB, for 3 years, using this antenna !)
<< IF noise reduction or another plugin is enabled? >>
Same parameters / settings I always use. Of course, I checked the HF AGC, HF ATT all was OK.
The weird thing is that the values got back to normal progressively after about 1h, for undetermined reason, without modifying a single parameter.
<< what time of day was this and what time of day do you usually use it? At least in the states most broadcast stations run with different day  and night power and antenna patterns >>
It was in the evening, as usual. This LF beacon is about 20 km from home and it strength level is very stable. That's why I use it to ensule my setup is OK (or to compare antennas for example).
<< And noise and signals do show a daily  pattern even on LF>>
As stated above, this would not explain why the SDRuno / RSPduo combo was showing the very usual values (same antenna, same cable, etc)
Nothing too bad of course, but quite surprising (never noticed this before).
I will run another test when the snowfalls stop. If it occurs again, I have to think about running SDR Console to see if it also shows unsual numbers, even if not as accurate as the "signal diagnostics" tool.
Pat
Le mer. 23 janv. 2019 à 12:48, prog <info@sdrsharp.com <mailto:info@sdrsharp.com>> a écrit :
On Wed, Jan 23, 2019 at 12:46 PM, Patrick wrote:
Is there an explanation to this ?
Lower ambient noise? Some neighbor is on vacation or changed his noisy TV?
IF noise reduction or another plugin is enabled?
In any case, you can trust what the signal diagnostics plugin says it's not
"just for display".


Re: Multiple SDR# instances running concurrently

EB4APL
 

Thank you, this was just treated, but my question is not for Spyserver but refers to SDR#


El 23/01/2019 a las 19:02, hmarais@... escribió:
You can pass the spyserver executable a config file to use on the command line. So you'd run multiple copies from the same program folder like so:
spyserver <config_file1>
spyserver <config_file2>
...and so on.

Regards,
Hennie Marais

Libre de virus. www.avast.com


Re: Airspy mini scanning software #sdrsharp #software

Sergi
 

Here you can get those plugins for SDR #:

http://rtl-sdr.ru/


Re: Multiple SDR# instances running concurrently

hmarais@...
 

You can pass the spyserver executable a config file to use on the command line. So you'd run multiple copies from the same program folder like so:
spyserver <config_file1>
spyserver <config_file2>
...and so on.

Regards,
Hennie Marais


Airspy mini scanning software #sdrsharp #software

Mike M <Mike@...>
 

Hello
has anybody found suitable software for scanning frequencies or a list of channels?

Here is a little information about me :-)

https://siliconhell.com/paralysed-using-an-amateur-radio
Many Thanks

Mike


Re: Weird "signal diagnostics" readings

Kenneth Sejkora
 

I can attest to this 'phenomenon'.  I use an RTL-SDR V3 dongle with SDRSharp in direct sampling mode to listen to 20-meters and other frequencies in the HF band.  I live between Boston and Providence, so there are plenty of AM transmitters in the vicinity.  After about 18:00 local time, and up until about 07:00 local, the spectrum displays some minor phantom signals about every 60 kHz apart.  However, during daylight hours, there are strong signals every 10.0 kHz apart on exactly 10-kHz multiples... 14,100.0, 14,110.0, 14,120,0, etc., several of which exhibit audible audio intermodulation with bandwidths up to 4 khz wide, like listening to a AM broadcast..  Same thing if I drop down to 75-meters... 3,800.0, 3810.0, 3820.0, etc.  No, I do not have any kind of AM broadcast high-pass or band-stop filter installed.  But once it starts getting dark, somewhere between about 17:30 and 18:30 local, those 10.0-kHz interval signals disappear.  I suspect it's a combination of both higher daytime power and different antenna patterns, as almost all of the AM broadcasters in the area exercise both practices of diurnal/nocturnal power and antenna patterns changes.

I did consider the possibility of temperature-related phenomena, such as joints/junctions in wires, fences, rain gutters, etc. being heated up by the sun and forming a pseudo-diode junction that radiated RF, but with recent single-digit daytime temps, the pattern looks the same as it does on warmer days.

Of course, your mileage may vary depending on the number of AM BCB stations, transmit power, frequencies, antenna patterns, etc. in your local vicinity.  I've been considering buying and trying an AM band-stop filter to see if it helps.  I'd welcome any experiences, successes, or failures anyone has had with such band-stop filters.

Good luck!

Ken, WBØOCV Norton, MA USA
41.959546N, 71.163996W  FN41kx


On Wednesday, January 23, 2019, 08:05:28 AM EST, jdow <jdow@...> wrote:


Dumb question - what time of day was this and what time of day do you usually
use it? At least in the states most broadcast stations run with different day
and night power and antenna patterns. And noise and signals do show a daily
pattern even on LF, at least around here in the past.

{o.o}



Multiple SDR# instances running concurrently

EB4APL
 

Hi,

I currently run several instances of SDR# and I have multiple copies of
the program folder which only differs in the configuration files, which
are tailored for different receivers.

While I think that I did my homework, I didn't found a trick for using
different profiles and only a program folder, such the one used with
Spyserver. While I tried the same schema, it did not work. Is it
possible to do it now or maybe something planned for the future?. This
way updating the program only in one folder is much better than doing it
in more than my current 12 copies.

Best regards,

Ignacio, EB4APL


---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
https://www.avast.com/antivirus


Re: Weird "signal diagnostics" readings

Patrick
 

Hi !

Thanks for the replies and comments.

<< In any case, you can trust what the signal diagnostics plugin says it's not "just for display >>
That's the reason why I was so surprised with the reading ! I know this tool is very reliable and I often use it.

<< Lower ambient noise? Some neighbor is on vacation or changed his noisy TV? >>
RSPduo / SDRuno should have also shown lower values in such a case, but they were the usual ones, as specified in my first post (signal strength for this beacon has been the same, within a dB, for 3 years, using this antenna !)

<< IF noise reduction or another plugin is enabled? >>
Same parameters / settings I always use. Of course, I checked the HF AGC, HF ATT all was OK.
The weird thing is that the values got back to normal progressively after about 1h, for undetermined reason, without modifying a single parameter.

<< what time of day was this and what time of day do you usually use it? At least in the states most broadcast stations run with different day  and night power and antenna patterns >>
It was in the evening, as usual. This LF beacon is about 20 km from home and it strength level is very stable. That's why I use it to ensule my setup is OK (or to compare antennas for example).

<< And noise and signals do show a daily  pattern even on LF>>
As stated above, this would not explain why the SDRuno / RSPduo combo was showing the very usual values (same antenna, same cable, etc)

Nothing too bad of course, but quite surprising (never noticed this before).
I will run another test when the snowfalls stop. If it occurs again, I have to think about running SDR Console to see if it also shows unsual numbers, even if not as accurate as the "signal diagnostics" tool.

Pat




Le mer. 23 janv. 2019 à 12:48, prog <info@...> a écrit :
On Wed, Jan 23, 2019 at 12:46 PM, Patrick wrote:
Is there an explanation to this ?
Lower ambient noise? Some neighbor is on vacation or changed his noisy TV? IF noise reduction or another plugin is enabled?
In any case, you can trust what the signal diagnostics plugin says it's not "just for display".


Re: Weird "signal diagnostics" readings

jdow
 

Dumb question - what time of day was this and what time of day do you usually use it? At least in the states most broadcast stations run with different day and night power and antenna patterns. And noise and signals do show a daily pattern even on LF, at least around here in the past.

{o.o}

On 20190123 02:26:53, Patrick wrote:
Hi there !
Yesterday, just after my HF+  was connected to the desktop, I tuned to my local LF beacon (received via ground wave) to ensure everything was OK using the 'signal diagnostics' feature. I immediatly noticed both the beacon strength and noise level were about 15 dB lower than usual.
I double-checked the cables, connectors, software settings, stopped SDR#, relaunched it, disconnected the HF+, etc,nothing abnormal found.
Then, I connected my second SDR (RSPduo), and surprisingly SDRuno software showed the usual readings, for both the local NDB and the noise floor.
Back to the HF+ / SDR# : still about -15 dB lower numbers
After about, say 30 minutes, new try : the discrepancy was then only about -8 / -10 dB, and after about 1h the readings were exactly the ones I usually have ...
No such phenomenon a few days before : the values were immediatly OK, within a dB (as expected I guess).
Is there an explanation to this ?
Thanks !
Pat


Re: Weird "signal diagnostics" readings

prog
 

On Wed, Jan 23, 2019 at 12:46 PM, Patrick wrote:
Is there an explanation to this ?
Lower ambient noise? Some neighbor is on vacation or changed his noisy TV? IF noise reduction or another plugin is enabled?
In any case, you can trust what the signal diagnostics plugin says it's not "just for display".

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