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Re: How to find this signal with all its harmonics

 

QUOTE:?? In my opinion, the signal strengt and the way it acts on the band is uncommon for CE signed devices. It should not be there, . . . . . .

If it comes from China, do NOT believe any of the regulatory markings!? China just prints labels and applies them appropriately with absolutely no attention or testing to international RFI/EMC regulatory laws.? Believe me, I was in the business of RFI/EMC until a few years ago.? I've experienced this practice for at least 2 to 3 decades.

Dave - W?LEV

Virus-free.


On Sun, Feb 2, 2025 at 5:43?AM pa3cqn via <info=[email protected]> wrote:
In my opinion, the signal strengt and the way it acts on the band is uncommon for CE signed devices. It should not be there, and it it better to find the source and solve the issue.?
?
?
But is the signal really there? That depends on the quality of the receiver. If it is a RTL-SDR dongle it is very likely that most of it is the result of the dongle beeing overdriven, and producing a lot of internally generated mixing frequencies. e.g. At my home I have to live with a strong repeater, P2000 (*)? and broadcast stations. Plus the occasional air-band when a Liveliner (*) passes overhead. And locally there is hdmi. All of these give me signals on my dongle that are not really there.
So question one is: what receiver is used in owrx? If it is indeed the infamous dongle you might reconsider putting much effort in finding the source. Instead build a band-filter to limit the signals coming in.
?
(*) for non-dutch: P2000 is a paging system for emergency services, Lifeliners are MMT choppers.
?
regards,
?
Henk
?



--
Dave - W?LEV
Re: TinySA 3.5mm jack

 

This is a also true with other devices that use surface mount jacks instead of through hole mounting. I would also recommend applying a little Deoxit D5 on the plug as a lubricatnt.

Mike N2MS

On 02/02/2025 8:57 AM EST Prawlin via groups.io <prawlin10@...> wrote:


The 3.5 Jack socket on these tinySA does seem to be a teeny bit small in diameter. The Jack plugs available also do vary in diameter. Try to find a plug which is not at all tight, or maybe take a fine file and carefully reduce the plug diameter until it slides in without much friction. If it is too tight you will likely break the surface mounted socket soldering. That happened to me and some others. HTH Peter
Re: TinySA 3.5mm jack

 

In the US, Switchcraft made a very popular line of 3.55 mm mono plugs and jacks that are still in production and are often found on older cables and equipment. They were frequently used for custom cables because they were easy to wire. They are not really compatible with modern stereo jacks and can sometimes do serious damage.
?
They were more or less standard for many years as they were very high quality. premade molded cables from places like Radio Shack often were built to this dimension as a result.
?
It's best to get rid of any old mono cables you have.
?
Since they are still available, some folks unwittingly make new cables with them.
?
M
?
Re: TinySA 3.5mm jack

 

The 3.5 Jack socket on these tinySA does seem to be a teeny bit small in diameter. The Jack plugs available also do vary in diameter. Try to find a plug which is not at all tight, or maybe take a fine file and carefully ?reduce the plug diameter until it slides in without much friction. If it is too tight you will likely break the surface mounted socket soldering. That happened to me and some others. HTH Peter
Re: Which to believe

 

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Thanks for the quick reply. ?You were spot on. ?I made the bad assumption that the scope input was 50ohms. ?I used a tee with a 50 ohm terminator and the readings are correct now.

On Sun, 2025-02-02 at 01:15 -0800, pa3cqn via groups.io wrote:

Just fiy:
?
Nice Youtube video on terminators:
?
For low frequencies you could also use a BNC-T terminated with 50 Ohm on one side.
?
?
Re: TinySA 3.5mm jack

 

I ended up opening the TinySA Ultra case and pinching a 3 conductor 90° male audio jack into the female socket between my thumb and forefinger to avoid putting pressure on the board. No damage was done, and the audio is working well.
Re: Issues with TinySA USB Connection in C#

 

One little issue i'd like to raise regarding the scanraw:
My python skript is constantly asking for scanraw, waits for the answer and asks again. The data is arriving pretty fast and the communication seems to stay robust over the time.
Unfortunately it seems to block some other serial communication as the screen freezes. I can wake it up by touching it, but then this error occurs: unpack requires a buffer of 1350 bytes
?
So I would like to use the data command, but according to this topic this isn't flawless? either?
?
FW: tinySA4_v1.4-151-g31a89ce.
Re: QtTinySA update to v1.0.2 #software

 

Thanks for this Ian,?

Library was hidden on my Mac got there in the end :)

On Sun, Feb 2, 2025 at 10:02?PM Ian Jefferson via <ian.jefferson=[email protected]> wrote:

/home/username/.config/QtTinySA
or in Windows 11:?C:\Users\username\AppData\Local\QtTinySA
or in macOS:?/Users/username/Library/Application Support/QtTinySA
Re: Which to believe

 

Just fiy:
?
Nice Youtube video on terminators:
?
For low frequencies you could also use a BNC-T terminated with 50 Ohm on one side.
?
?
Re: Which to believe

 

On Sun, Feb 2, 2025 at 08:09 AM, Rick Stanback wrote:
-33dBm
First question: did you use a 50 ohm termination on the scope? It appears you didn't. So the generator is putting out 10 mV into the 10 meg or so scope.
If you had a 50 ohm termination that would halve to 5 mV (the generator has an output impedance of 50 Ohms so the voltage would halve).
5 mV in 50 Ohms is .5 microwatt is -63 dBW is -33 dBm. That is spot-on.
?
You are measuring a square wave on the scope. A square wave can be seen as the sum of infinite odd harmonics of a sinewave. The SA is only measuring the fundamental? sinewave.
Than the power in that sine is .707*5 mV == -66 dBW or -36 dBm. Or in a quick manner: -33 - 3 == -36 . -37 is well within the specs of the SA in your settings.
?
Your measurements are correct.
?
regards
?
Henk
?
?
Re: QtTinySA update to v1.0.2 #software

 

/home/username/.config/QtTinySA
or in Windows 11:?C:\Users\username\AppData\Local\QtTinySA
or in macOS:?/Users/username/Library/Application Support/QtTinySA
Which to believe

 

I have an Elecraft XG3 signal source that I use for troubleshooting
radios. It outputs a square wave full of harmonics that can be set for
-107dBm,-73dBm, or -33dBm. I have attached some screenshots from my
Oscilliscope and the tinySA. When I was using the tinySA with the
windows app the app measurement did not agree with what I see on the
screen.

So basically none of my readings agree. The scope measurements kind of
bother me because they are pretty far off. This is not a lab quality
scope (Hantek DS02D15) but I did not think it would be this far off.
Just wanting some input on how to resolve these differences.

thanks.

dso_01_01_06_48_22.bmp
tinysa_LOGMAG_S11_2025-02-01_17-17-42.png

Re: How to find this signal with all its harmonics

 

In my opinion, the signal strengt and the way it acts on the band is uncommon for CE signed devices. It should not be there, and it it better to find the source and solve the issue.?
?
?
But is the signal really there? That depends on the quality of the receiver. If it is a RTL-SDR dongle it is very likely that most of it is the result of the dongle beeing overdriven, and producing a lot of internally generated mixing frequencies. e.g. At my home I have to live with a strong repeater, P2000 (*)? and broadcast stations. Plus the occasional air-band when a Liveliner (*) passes overhead. And locally there is hdmi. All of these give me signals on my dongle that are not really there.
So question one is: what receiver is used in owrx? If it is indeed the infamous dongle you might reconsider putting much effort in finding the source. Instead build a band-filter to limit the signals coming in.
?
(*) for non-dutch: P2000 is a paging system for emergency services, Lifeliners are MMT choppers.
?
regards,
?
Henk
?
Re: QtTinySA update to v1.0.2 #software

 

Thanks for this Ian, any ideas where the db file would be stored on a Mac OS version?


On Sun, 2 Feb 2025 at 10:46, Gary W9TD via <w9td=[email protected]> wrote:
Wolfgang,
Thanks, it works perfectly now.
Gary
W9TD
Re: Invitation: How high will your tinySA Ultra go?

 

(pertaining to TinySA Ultra non-+, type 405):



EXPERT CONFIG activates the expert configuration menu
HARMONIC sets the harmonic to use in harmonic mode. Leave at 3 unless you absolutely need to be able to see higher frequencies

The link EXPERT CONFIG takes me to:



HARMONIC does not appear here.

I would like to know the behavior of HARMONIC and it's settable range (the text above only suggests leave at 3; as I absolutely need to see higher frequencies, what range exists and what does this do?

Thanks!

Dave
Re: How to find this signal with all its harmonics

 

Why not use your TINYSA and a directional antenna to locate the source.? That should be the first step in alleviating RFI.? Even a 3 or 4-element Yagi on 70-cm is directional enough to find the source. ?

Dave - W?LEV


On Sat, Feb 1, 2025 at 10:31?PM eelcodegraaff via <eelcodegraaff=[email protected]> wrote:
On Sat, Feb 1, 2025 at 11:35 AM, pa3cqn wrote:
These are signals in the ISM band. The horizontal bar is a nearby (outdoor?) sensor. They are very wideband and pita for shure.?
These signals are very common in urban surroundings..
?
?
Thanks for your reply.
The red segment, is a quite loud signal, and from what i have seen is is spread over the 2m and 70cm band. And, we seem to see this signal not only in my house but also surrounding houses in a distance of more than 500 meters. What brings us to to a discussion i have with some other HAM'd. does someone make use of amplifiers whitout knowing what is gooing on on the bands. There are a lot of preppers and also hobbyists that like to see if they can strengten a signal without knowing the effects of it. The Red signal transmittion gives over the whole horizontal image a signal and i hink it is in fact "splatter"? over the a wide frequency area.? It is not harmonics but in this case that high energy it spreads way to far.?
?
What i am searcing for is :
1) Could i use TinyGS to make messurements to see how wide signal is "splattering"?
2) Am i able to make a recording into the TinyGS for lets say 2 hours since it comes in waves but not om a standard rithm.
3) From there is it possible to figure out, what type of device could make a transmittion at this frequency. I think the 2 meter band, where this is signal is verry visible should be such a signal, it is not lora, not an transmitter, it could be a type of packet radio signal, but, It seems to me a digital signal.
4) it could be interesting to figure out what kind of transmittion it is, like is it a lora signal, a wspr signal, a ft8 signal or packet signal, that makes it a smaller list of candidates.?
?
In my opinion, the signal strengt and the way it acts on the band is uncommon for CE signed devices. It should not be there, and it it better to find the source and solve the issue.?
?
We have a large transmittion tower i the area full with G5 and other ecquipmemt and maybe there is some sort of malfunction.
?
I can;t imagine this is a normal and acceptable signal, it harms the reception of NOAA, Meteor, Conversations, HAB signals and so on...
?
And i want to learn if it is possible to dril down to find the sources ... and maybe it is a misson impossible but, some guidance how to start would be a first step to a possible solution.?
?
As stated i am new, and learning, and want to learn, and if it is a sensor, i want to find it, and see how we can solve the issue?
?
I agree with you it points in the direction of a sensor (but on a frequency that is not common used for sensors as far as i know)? ... but it is one that does not comply to the regulations as fas as i know, and it is causing issues... for me as a ham ..? :-(?
?
Regards
?
Eelco
?

?



--
Dave - W?LEV
Re: How to find this signal with all its harmonics

 

On Sat, Feb 1, 2025 at 11:35 AM, pa3cqn wrote:
These are signals in the ISM band. The horizontal bar is a nearby (outdoor?) sensor. They are very wideband and pita for shure.?
These signals are very common in urban surroundings..
?
?
Thanks for your reply.
The red segment, is a quite loud signal, and from what i have seen is is spread over the 2m and 70cm band. And, we seem to see this signal not only in my house but also surrounding houses in a distance of more than 500 meters. What brings us to to a discussion i have with some other HAM'd. does someone make use of amplifiers whitout knowing what is gooing on on the bands. There are a lot of preppers and also hobbyists that like to see if they can strengten a signal without knowing the effects of it. The Red signal transmittion gives over the whole horizontal image a signal and i hink it is in fact "splatter"? over the a wide frequency area.? It is not harmonics but in this case that high energy it spreads way to far.?
?
What i am searcing for is :
1) Could i use TinyGS to make messurements to see how wide signal is "splattering"?
2) Am i able to make a recording into the TinyGS for lets say 2 hours since it comes in waves but not om a standard rithm.
3) From there is it possible to figure out, what type of device could make a transmittion at this frequency. I think the 2 meter band, where this is signal is verry visible should be such a signal, it is not lora, not an transmitter, it could be a type of packet radio signal, but, It seems to me a digital signal.
4) it could be interesting to figure out what kind of transmittion it is, like is it a lora signal, a wspr signal, a ft8 signal or packet signal, that makes it a smaller list of candidates.?
?
In my opinion, the signal strengt and the way it acts on the band is uncommon for CE signed devices. It should not be there, and it it better to find the source and solve the issue.?
?
We have a large transmittion tower i the area full with G5 and other ecquipmemt and maybe there is some sort of malfunction.
?
I can;t imagine this is a normal and acceptable signal, it harms the reception of NOAA, Meteor, Conversations, HAB signals and so on...
?
And i want to learn if it is possible to dril down to find the sources ... and maybe it is a misson impossible but, some guidance how to start would be a first step to a possible solution.?
?
As stated i am new, and learning, and want to learn, and if it is a sensor, i want to find it, and see how we can solve the issue?
?
I agree with you it points in the direction of a sensor (but on a frequency that is not common used for sensors as far as i know)? ... but it is one that does not comply to the regulations as fas as i know, and it is causing issues... for me as a ham ..? :-(?
?
Regards
?
Eelco
?

?
Re: QtTinySA update to v1.0.2 #software

 

Wolfgang,
Thanks, it works perfectly now.
Gary
W9TD
Re: QtTinySA update to v1.0.2 #software

 

Try Firefox?


On Sat, Feb 1, 2025, 2:00?PM Donald S Brant Jr via <dsbrantjr=[email protected]> wrote:
Trying to download the QtTinySA_win.zip package, both Chrome and Opera flag the download as having a virus.? The others seem OK.??
Any tips on how I can get the Windows package?? "Make it up from source code" is not an option.
Best regards, Don Brant
Re: QtTinySA update to v1.0.2 #software

 

Trying to download the QtTinySA_win.zip package, both Chrome and Opera flag the download as having a virus.? The others seem OK.??
Any tips on how I can get the Windows package?? "Make it up from source code" is not an option.
Best regards, Don Brant
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