Temporal strange noise and no RX after starting (tr)uSDX

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DO1KKA
 

Posts: 2
Joined: 20 Apr 2022, 09:52

Temporal strange noise and no RX after starting (tr)uSDX

Post by DO1KKA »

Dear all,

I have some strange issues with my (tr)uSDX. I have mine from the group buy SN3AK, but changed the Atmega because I burned the chip while assembling it (shortage at SPI connector).
The chip seems to be a genuine chip, at least I got a normal serial-number after I flashed the bootloader.

Here is the problem:
Almost every time I start the device, either from 5V or from 12V, it makes a loud noise (internal and external speaker), shows at all bands constantly about -70 dBm to -90 dBm and has no reception. It makes no difference if there is an antenna connected or not. After some time, the loud noise stops, and the device receives normally, so that I can use it. Sometimes the noise doesn't stop and I can make it stop if I play a little bit with the power/USB-connector, so that it, maybe(?), looses for a short time voltage. Other times absolutely nothing helps and I can't use the device for receive.
I already tried to reset the settings and to upload the firmware again, but that didn't help.

Has anyone had this issue too and found a solution to this weird issue? Or maybe someone has an idea what could cause that issue?

73's,
DO1KKA
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