¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. QRPLabs
  2. Topics

No TX or RX ¡ª Seeking Next Steps for Troubleshooting #qmx

 

Hi everyone,

I recently completed building my QMX kit and it seemed to go well on the surface. The unit powers on just fine, the display works, menus respond, and voltages on the 3.3V and 5V SMPS look normal. However, I'm getting no power output on any band, and I haven't heard any received signals either (just noise). Here's what the diagnostics look like:

I've verified all diode orientations match the silkscreen and build guide, and I've done my best to verify good continuity on the pads for all of the toroids. Maybe there's a bad solder joint somewhere less obvious. Does anyone have advice on where to look next or more checks you¡¯d recommend to further narrow this down?

Any help would be much appreciated!

Thanks,
Joe
 

Did you install the jumper at JP501, behind the BNC connector?

Roger

Get
On 8 May 2025, at 15:36, "Joe via " <gmail.com@groups.io target=_blank>[email protected]> wrote:

Hi everyone,

I recently completed building my QMX kit and it seemed to go well on the surface. The unit powers on just fine, the display works, menus respond, and voltages on the 3.3V and 5V SMPS look normal. However, I'm getting no power output on any band, and I haven't heard any received signals either (just noise). Here's what the diagnostics look like:

I've verified all diode orientations match the silkscreen and build guide, and I've done my best to verify good continuity on the pads for all of the toroids. Maybe there's a bad solder joint somewhere less obvious. Does anyone have advice on where to look next or more checks you¡¯d recommend to further narrow this down?

Any help would be much appreciated!

Thanks,
Joe

1 - 2 of 2