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Re: Tiny SA Ultra for GNSS signal checking

 

Here’s an interesting paper on the topic -



-Charlie?
Re: Signal Generator level output

 

On Tue, Feb 6, 2024 at 05:22 AM, JCR wrote:
I have installed firmware version 151 and the output signal in generator mode is maximum -115dBm. Not changed at -124?dBm
? ?See specifications in the tinySA Ultra Wiki.? The minimum output in the signal generator mode is depreciated to -115dBm.

"Output level selectable in 1dB steps between -115dBm and -19dBm"


Herb
Re: Signal Generator level output

 

I have installed firmware version 151 and the output signal in generator mode is maximum -115dBm. Not changed at -124 dBm
Re: TinaSA Ultra - Sweep command giving back random data error in dBm Field.

 

Bob,
There is a bug in the number out
Hope to fix in next fw update?
--
Designer of the tinySA
For more info go to https://tinysa.org/wiki/
Re: Tiny SA Ultra - What do the parameters of the lna2 command mean

 

Use the lna command. Not the lna2 command
--
Designer of the tinySA
For more info go to https://tinysa.org/wiki/
Re: QtTinySA PC Application

 

Hi Simon,

In the Github discussions would be my preference for ideas/suggestions.? There is a also an issues list in Github.



Ian
TinaSA Ultra - Sweep command giving back random data error in dBm Field.

 

Hi all

Has anyone had trouble with dodgy data in the dBm field in the data returned from a sweep.? e,g, "sweep 520M 530M 21"

I am getting:

552700000 -:.000000e+01 0.000000000

You will notice that the "-" sign is intact, but the characteristic part (the integer before the decimal point) has been replaced with a colon ":"

It is always the same error pattern and only occurs in the second field of the data record.? I doubt it is a comm's issue as it would not affect the same character each time. I tried a couple of slower baud rates, but that made no difference.

I am sweeping selected bands and averaging the spectra using a running mean. When I get bad data I exclude it from the running mean so I am still getting valid results.

I have attached a log of the errors reported by my application.




SweepReturnData_errors.txt
SweepReturnData_errors.txt

Re: Tiny SA Ultra - What do the parameters of the lna2 command mean

 

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That's OK,


But I do need the LNA it gives me a big boost in SNR. The TV signals are down around -80dB mark.

Regards

RJG

On 6/02/2024 5:12 pm, Erik Kaashoek wrote:

Bob,
You should not use the "lna2" command as it is for internal use only and it cause the measured values to be wrong
If you need the lna use the "lna on|off command"
But give you are talking about TV signals you probably won't need the lna.
--
Designer of the tinySA
For more info go to

Re: Tiny SA Ultra - What do the parameters of the lna2 command mean

 

Bob,
You should not use the "lna2" command as it is for internal use only and it cause the measured values to be wrong
If you need the lna use the "lna on|off command"
But give you are talking about TV signals you probably won't need the lna.
--
Designer of the tinySA
For more info go to https://tinysa.org/wiki/
Re: Tiny SA Ultra - What do the parameters of the lna2 command mean

 

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Hi Erik,

I am going to use auto, but I am writing a channel scanning monitor in B4j which I will publish when I have completed it.? I just want to ensure the application covers all of the parameters available.??

So what are the gains selected for each number?? I wish to make a drop down list for the user to select the gain they want plus AUTO which would be the default.

I am building this thing because our TV channels drop out when the satellite down link to the transmitters fails during rain events.? The signals are down around -85 dbm so the LNA improves the signal to noise ratio. A lot of people in our area have bought new antennas to get over the problem? of dropout, but of course this is pointless as the problem is with the transmitter down-link not the transmitters themselves.?

At the moment I am using my Tektronix RSA 607A to do the monitoring, but it ties it up 24/7 and I use it a lot for ad hoc stuff. That is why I am building the channel monitor App using the TinySA Ultra.? The software of the Tek is pretty clunky and its logging facilities are pretty hopeless so I'm rolling my own.

Here is a screen shot of my app's config tab page.? All the configs are stored in an sqLite db, and the logged data will use a separate sqLite db.??

I will probably sample the channels every minute, but log the channels every five minutes unless the signals of any channel fall below a minimum or increase above a maximum, then I will generate a log entry to record the change.??

I have used sqLite for a number of logging apps and it is very robust and flexible. sqLite also handles power loss or crashes as it has a write ahead feature (WAL) which prevents corruption under most power loss or crash conditions.?
Writing binary or csv files doesn't cover this. SqLite although it is a single user db without record locking does allow multiple reading. In logging apps this is fine because only one app is writing to the database. SqLite is also ubiquitous on Android and Apple phones so it is multi-platform.

It is easy to export queried data to csv using tools like sqLite Studio, DB Browser or from any app in pretty much any language.??

I use B4j as it is written in Basic and a bit of Java, has a good community and is in active development. It doesn't have a steep learning curve like C++ or Qt.

You can see from the screen shot the channel allocations used on our Mt Tassie transmitters.? There are five channels:

  • Southern Cross TV
  • Australian Broadcasting Commission
  • Special Broadcasting Service
  • Win TV
  • Prime TV

Each channel has multiple services encoded within them.

The blue line represents the band width of the channel and the colored horizontal line represent the trigger thresholds. I have the scanning and averaging of scans working.

I now have to write the trigger code and the code to store the scanned data into the data DB.

I also have a LiteVNA which I use for TV antenna troubleshooting. I have a Tektronix TTR607A for the lab work, but it is too expensive

to cart around, it needs ac mains and the Tek software is clunky and very limited. It doesn't even provide time domain measures for cable analysis.?

The LiteVNA is perfect for this work.

Kind Regards

Rob

-------------------------------------------------------------

On 4/02/2024 5:25 pm, Erik Kaashoek wrote:

0..7 is the available range of gain settings
Why do you use this?
--
Designer of the tinySA
For more info go to

Re: Tiny SA Ultra for GNSS signal checking

 

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On 2/5/24 03:51, Bob Ecclestone wrote:
I would have thought that a basic normal GPS receiver (like a Garmin Etrex, etc) would be able to determine GPS satellite coverage and if the?reported position is erratic, suspect jamming or spoofing.

I expect it depends on the details of the jamming or spoofing. It might be jamming as simple as a broadband noise source, or it might be an sophisticated spoofing signal that slowly drives the apparent position of a military user off by a great distance. Or something in between.

Commercial airliners have problems with GPS, and I would hope they have better receivers than do us consumers who paid maybe only a hundred-ish bucks for a GPS receiver. If so, your Etrex is not immune.


-kb
Re: Signal Generator level output

 

Install v151 and see if that changes things.
Re: #firmware_update #firmware_update

 

Maybe try the latest v151 code?
Re: QtTinySA PC Application

 

Hi Ian,

Thanks for your software ! I've also read that you are open to feature requests ! what is the best place to request new features ? ( under this post or github? or anywhere else ?)

Simon
Re: >> 450 points to SDcard. precison of tinySA-App in standalone operation #feature_request #csv

 

Hi Diego,

Thanks for your answer. I'm going to try this python program thank you ! your procedure sounds great indeed. My wish is to see it being automated in a? "time saving" function in the future. I've just found out a similar request had already been done in an other post a year ago ([email protected] | Tinysa Ultra trace export to CSV with more data points)?and Erik gave an answer to that request there.
It seems there is a few of us around here using TinySA for RF mics coordination and requesting specific features. Just found out about the app "QT tinySA" as well which looks promising for our use.

Cheers,

Simon
#firmware_update #firmware_update

 

Hello. I'm new to this forum and I apologize in advance because I don't really know how it works. I have been following the messages of this group since I bought the TinysaUltra on Falcon Radio in Spain. I have updated the firmware version without any problem so far. I have seen a detail. In version v1.4-143 2024-01-10 it says that... "the minimum output level can be set to -124 dBm, where the actual minimum output level is -115 dBm." I have version 146 installed and the minimum output level is -115 dBm. Thanks for all the work.
Signal Generator level output

 

Hello. I have been following the messages of this group since I bought the TinysaUltra on Falcon Radio in Spain. I have updated the firmware version without any problem so far. I have seen a detail. In version v1.4-143 2024-01-10 it says that... "the minimum output level can be set to -124 dBm, where the actual minimum output level is -115 dBm." I have version 146 installed and the minimum output level is -115 dBm. Thanks for all the work.
Re: Tiny SA Ultra for GNSS signal checking

 

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Hi All,
I am certainly no expert here, but my experience with GPS problems have mainly been due to severe multipath in high rise city areas giving erroneous location data or thick trees in heavily wooded areas blocking the GPS signal altogether.
I would have thought that a basic normal GPS receiver (like a Garmin Etrex, etc) would be able to determine GPS satellite coverage and if the?reported position is erratic, suspect jamming or spoofing. The TinySA Ultra should be able to locate the jammer. The use of a directional antenna should enable narrowing down the source or at least the direction. If you are really serious, I would also use a band pass filter, or a combination of a high pass and a low pass filter between the antenna and the TinySA. By using pre-selection, you could enable the internal LNA and drop the noise floor even further.
Even if it is a more sophisticated spread spectrum jammer, you should be able to see a "bump" in the noise floor as you sweep the antenna through its location.
I agree the use of a normal GPS puck is impractical because it is basically omnidirectional as stated by others AND it requires power.
Cheers...Bob VK2ZRE


On 5/02/2024 1:05 pm, chri5k via groups.io wrote:

GPS antenna's like the one linked are tuned to two specific frequency ranges 1165-1278MHz and 1559-1612MHz. In those bands, it has gain of ~6dBi at 90 degrees elevation. At ~20 degrees elevation, it drops to 0dBi. So a 3D cone shaped pattern facing upwards. The LNA is mostly there to overcome cable losses. As mentioned earlier, the GPS system uses spread spectrum and digital signal processing to distinguish the signal from the noise. The receiver is able to tell the direction, distance and elevation angle of the satellites by processing time delays, doppler shifts and carrier phase measurements. Hence my suggestion to use a GPS receiver, antenna and software to accomplish the OP's tasks instead of a spectrum analyzer.

Re: Generator output power extremely low

 

At what output level does the output get stronger?
--
Designer of the tinySA
For more info go to https://tinysa.org/wiki/
Generator output power extremely low

 

My Tiny SA Ultra puts out a generator signal way lower than expected. As I keep reducing the output level, at some point it starts to get stronger on the connected receiver before disappearing below the noise way sooner than expected. I have tried it on several different receivers with the same result. I don't have another SA I can use to actually measure the output power level. I have been very careful to protrct the ports from static and always use attenuators between a transmitter and the SA port. The SA is a only a few weeks old so any suggestions as to what I might be doing wrong before I return it to the seller ? It passes all the self-tests fine.
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