Yesterday I have executed the steps on this page. The hint regarding the 0 Hz vertical line is especially helpful. In my case, this vertical line is present, and as such, no complex repair is to being expected. The attenuation function is okay.
LNA is clearly defect and because the test signal shows only -55 dBm on the spectrum, the switch should be defective, too.
Thus I'd have to replace the switch and the LNA, not the attenuator.
Section Fault finding with oscilloscope:
I don't find L1 and L7 (HW 0.4.5.1).
BTW: I now believe what "LOW OUTPUT" on top of the screen means: the bottom connector, not something like low level voltage.
In general I se need to implement any changes to this page.
Rob
On Wed, 26 Feb 2025 13:47:28 +0100, Erik Kaashoek via groups.io <erik@...> wrote:
I've added a page to the wiki describing some steps for manual fault finding.
Could some of the users that have (had) problems with their HW have a look at this page and check if it helps them locating the probable faulty component(s)
?
--
Designer of the tinySA
For more info go to
