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If Erik was to create a kickstarter or some such, for a TinySA with a larger screen and some of the other most requested features, I would immediately support it. I greatly appreciate the (thankless) work done by any project maintainer, and where possible I will support them. I feel I am not alone in this either.
/ Gerry

Can you connect to the tinySA serial over USB using a terminal emulator and issue the command
leveloffset
and post the generated output?
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Can you try calibration and self test with both cables?
Seems the calibration level is wrong
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Upon checking again the 10MHz output it still showing the exact same error of -27Hz, but the error on 150MHz output dropped to only 67Hz, which would be now quite workable for NFM testing.

The modulation is 8 bit, the unit is NOT an 'NFM testing' device. How do you propose to control modulation and deviation ?
Wrong tool for the job.

The missing "S" is already known (and fixed in the git repo):

As for the original bug report in this thread, the one related to markers, I assume it is some sort of integer overflow problem because 2^32-1 = UINT32_MAX = 4'294'967'295 ≈ 4.29 G.

Rudi, I can't find the missing 'S', please help me.....
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On Mon, Apr 18, 2022 at 04:57 AM, <tinysa-iogroup@...> wrote:

Or why is the 10MHz output still showing the same frequency error? Perhaps I did something wrong or are these results within expectations?

See wiki entry,? last line:?https://tinysa.org/wiki/pmwiki.php?n=Main.SETTINGS3
?
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Frequency correction done: measured LO Output at 10MHz and it was found to be off by -27Hz, or 9.999.973MHz.
And just to also have a reference at a higher? frequency, measured output at 150MHz, and it read -0.39K, or 149.999.610MHz.
Frequencies above measured on calibrated service monitor that directly reads and displays the frequency error of the input signal.

Then entered 9.999.973MHz at the frequency correction section in the expert menu.
Upon checking again the 10MHz output it still showing the exact same error of -27Hz, but the error on 150MHz output dropped to only 67Hz, which would be now quite workable for NFM testing.

So something was definitively compensated for. But I am assuming the frequency step resolution is not fine enough for the compensation to clearly show up on much lower frequencies? Or why is the 10MHz output still showing the same frequency error? Perhaps I did something wrong or are these results within expectations? Thank you.

I would also like to suggest that you change the default audio modulation frequency at least for NFM mode from the present 5KHz to 1KHz. That would also save an extra generator setup step.
Besides nobody would even be able to use 5K in NFM as the radio receiver discriminator limits the audio response to voice bandwidth which is 300Hz to 3KHz.
This is also true for any other 2-way radio using any other modulation mode be it AM, SSB, DATA, etc. Perhaps on WFM where audio bandwidth extends to 15KHz, a 5K tone might be used at times, but I doubt it would really be of much use at least as a default frequency.

And as I mentioned in my initial post, in NFM mode the modulation tone is currently pushing 5Khz carrier deviation which is equivalent to 100% modulation. But if deviation could be lowered to 3KHz deviation which is 60% modulation, it would be much more useful. In short a 1KHz modulation test tone with 3KHz carrier deviation is the universal test standard used for NFM modulation on 25KHz bandwidth channels. Its half that on narrowband 12.5KHz channels.

Thank you.

BTW small correction to my initial opening post:

I was testing the generator yesterday and it seems very promising to test radio receivers by using some external attenuation in the order of 50dB (NOT 30db) to bring the signal level down to a usable microvolt range.

If I had to choose only one output mode setting to be saved at the end of the session it would be the frequency. Ideally saving both frequency and level if possible would be nice.

To compensate for the low 390Hz output frequency I would go to CONFIG > EXPERT CONFIG > MORE > MORE > CORRECT FREQUENCY, would this be the correct section?
But since it asks to enter the actual 10MHz frequency I assume I need to set the output to 10MHz, measure the actual frequency I see and then enter it there?

So is there no way (or trick) to access the expert menu from within the output mode, correct? Just want to make sure I did not miss anything.

Thank you.

Hello Erik,

In firmware tinySA_v1.3-347-g31eb02e.dfu in the menu:
There is a letter "S" missing: DISPLAY->SWEEP ACCURACY->SPEEDUP

73, Rudi DL5FA

Marker 2, 3 or 4 in Delta mode, when they are exactly overlapping Marker 1, their indications are sometimes 4.29GHz instead of 0Hz.?

? ? ??

(next picture: when set Marker 4 to Tracking mode, it changes from displaying 0Hz to 4.2949GHz)



This is not a problem, but?it may be useful to know this behaviour in order to solve a problem,?an indication for debugging something.?

Toni

On Sat, Apr 16, 2022 at 07:34 AM, <tinysa-iogroup@...> wrote:

but was wondering if the expert config menu frequency (and level) correction items also have effect to the output frequency.?

Yes, one setting works in an identical way on both input and output.

One last question, is there any way to keep the output mode settings once you leave that mode?

No, there is insufficient memory to store all settings but I may squeeze in some more. Please do specify your prioritized list of output settings.

?
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Hello,

I was testing the generator yesterday and it seems very promising to test radio receivers by using some external attenuation in the order of 30dB to bring the signal level down to a usable microvolt range for that purpose along the build in variable attenuator. One thing I noticed is that the output frequency of my unit is slightly low, for example if I set the frequency to 150.0000MHz the output will be about -0.39K low which for FM radio receivers is quite a bit. I managed to get within about 65Hz of the correct frequency by setting the output frequency to 150.0004, but was wondering if the expert config menu frequency (and level) correction items also have effect to the output frequency. I also noticed that this menu is not directly accessible when in output mode, so one has to switch modes back and forth to access the configuration menu and verify any changes. Not sure if I am missing something here and the menu can be somehow accessed directly without leaving output mode?

One last question, is there any way to keep the output mode settings once you leave that mode? When I go back into output it always opens with a default of 10MHz and -7dBm. Not a big issue but I wonder if there might be a way to store the last used settings, or at least modify the default start to something closer to what one would be expecting to use.

Another idea I wanted to put out there is if one of the future firmware updates could include two NFM modulation options, not just one. The present one modulates the signal +/-5KHz which is mostly fine and equivalent to 100% deviation in a 25KHz channel bandwidth FM radio operation (Ideally it would be +/-3KHz), but more often one has to deal with 12.5KHz bandwidth and maximum 100% deviation in that case should be +/-2.5KHz. I realize this will not be something very useful for most users not interested in radio communications, but though I put it out there just in case as it would be a great addition if possible without too much programming overhead. A variable deviation adjustment would be fantastic, but again I understand that not many people of the main target users of this device would really need it so its not going to make it very high on the list of firmware update priorities.

So far great little device that will be very useful and might even save the big service monitor some field trips, which is something I do not enjoy doing as I always try to travel as light as possible. The TinySA would definitively also be a great addition to always take along for the "just in case" scenarios, something I cannot do with the regular service monitor.

Thank you.

Why don't you use a USB power bank, designed to re-charge mobile phones, if you want to extend the useage on battery. Simply plug into the USB socket on the tinySA. No need to open the unit or worry about size of connector.