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I can confirm the quality of old inductor seemed to be the problem. It had 9R resistance - I substituted a 33uH SMD one with 2R resistance and all is good. Thanks to all for the help, Neil G4BRK

Found this, looks good: https://github.com/df8oe/UHSDR/wiki/USB-CAT-and-AUDIO-Mode 73 de Paul DJ0CU

Hi Tom I'm not convinced still... I do think that there is a way! But we will see... 73 Hans G0UPL http://qrp-labs.com

I meant that characters never show up. I believe that others understood me. If you read the threa

Oh I forgot to mention that I also connected a rtlsdr stick to the hub. The rtlsdr stick is connected to the if signal. I use sdr console v3 on the pc. To change frequencies omnirig sw is used

That is just plain wrong! The QCX could be working and writing characters to the display and you would not be able to see them. You should be able to adjust the contrast so the blocks become so faint

Hi all, i do not think that one cable for both cat an sound at the same time will work unless the pc sees the qsx as a usb hub with two devices connected a serial interface for CAT and a usb sound

They say it will not pass some of the digital hash if it is in place Tim

Mine is No.1300 Not sure if it's an early one or not? Think I may order a replacement micro-controller. If its not that at least I will have newer firmware.

Thanks Tim that works. Is there a reason why I need to replace L5? It seems to work fine with the jumper in.

FT8 is killing our hobby !

Hi Hans, I had been wondering the same thing but didn't want to distract you from your work. I will stay tuned! The ability to do both at the same time (whether over one USB cable or two) would be a

Hi Arvo The question is clear and is a good one. I believe that theoretically QSX can manage both the USB Audio and the CAT control, along the same cable. This is because a USB connection supports

Short out L5 under processor and try that Worked for me Some early inductors had issues If it works replace with new 50-100 uH Tim

Hello, Hans. Thanks for all the hard work on the QSX. Could you help with a little clarification? I understand the QSX, when connected by USB cable to the PC, will appear as a sound card.? Thus, when

Summary: I built an early (#254) QCX kit and it shows only white blocks on power up. I have? read and followed the trouble-shooting doc and group posts with no progress.? ? Details: I had

If yours was an early kit, replace L5.

Thanks for your answer Richard, I'll give that a try. :)

Review all the solder joints with a magnifier and touch up as required. If still no joy, I would order another micro-controller. -- 73, Bernie, VE3FWF

Over the years several of the QRP groups have offered a simple multiband signal source kit. The one I have covers 80-20 meters and has S1, S3 and S9 selectable output. Could be a great addition to