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Hi to the group,

I just received my TinySA from Zeenko, quickly shipped and well tracked by Aliexpress.
This is a great instrument and congratulation to Erik and all for such an outstanding piece of equipment.
Thanks to this group's archives, I could find the ST driver and could upgrade the firmware to the latest version.

I own a HP generator and a Signal Hound SA44 spectrum analyser ; I checked the TinySA from 3 to 144 MHz, and with different signal levels, the result are really impressive.
As a signal generator, from 3 to 144 MHz, output level tracks very finely from -44dBm to -6dBm.

However, there is a sudden discrepancy in the output level from -45dBm to -76dBm, in fact the output level is -4 to -5 dBm lower, independent of frequency.
Is this "normal", and is it possible to correct this ?

Thanks again and best regards.

?

Georges F6DFZ

George,

There is a trick in the HW to extend the output levels down below -44dB. This trick depends on a, not so well specified, parameter of a component.
Up till now I have not found, using a limited set of prototypes, deviations larger than 2dB.?
Its currently not possible to correct this but?I will look into adding in the config data a manual settable correction entry to compensate for this deviation of lower output levels.
--

Hi Erik,

Happy to know this is "normal ", and many thanks, if in the future, you can have this corrected.

Best regards ,

Georges F6DFZ?