On Fri, Apr 4, 2025 at 04:32 PM, Gerd wrote:
Erik, did you design the printed circuit board ?
?
Yes
?
?
Before I started to disassemble the device, I decided to check if the signal generator was working. A picture of this menu is attached to the letter, the problem also affected this part of the control circuit. When I selected LOW OUTPUT - ON from the menu, a signal appeared at the RF tinySAoutput, but the frequency barely ran 50MHz. From that frequency onwards, the device could no longer hold the signal carrier. I have not tested the signal generator of this device before, so I have no comparison of how it should work.
?
You have to switch the signal generator LOW OUTPUT to ON to get the correct output signal
?
?
I opened the tinySA ULTRA at Erik's suggestion and a visual test did not detect any poor connections.
Since I have had problems with similar cable connections in other devices before, I cleaned the cable terminals just in case (even though there was no visible problem).
?
After reconnecting the ribbon cable, almost all problems disappeared. Self Test was successful.
?
Happy to hear
?
?
Even after a successful Self Test, the signal generator is unable to transmit a signal in normal mode, I have to activate LOW OUTPUT - ON in the menu. Is this a normal approach or is there another problem here?
?
This is normal behavior
I also took a picture of the last measurement.
?
Erik, based on the information you provided, could you tell me which terminal in the ribbon cable had a poor connection? I'll look at it later with a powerful microscope. (It seems that some types of connectors are not worth the money.)
?
Don't know, sometimes we see this problem, hence the suggestion to reseat the cable.
--
Designer of the tinySA
For more info go to
