QRP Labs QCX mini/QMX

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1

What digirig setup (serial connection and cables) should I get if I use my QRP Labs QCX mini/QMX ?

2

My understanding that these transceivers are only suitable for CW use.
Digital modes typically require the bandwidth of a voice channel.
You can however use Digirig’s PTT switch for keying up CW.

3

I was also wondering about @N4FJC 's goal, and which radio they want to use. I do not own these radios. I understand the QCX is CW and the QMX is CW/WSJT-x/JS8CALL/RTTY/Olivia modes which need not use SSB. QMX has an onboard soundcard.

73 Constrainted

4

Thank you both for your responses. I currently own a mini, and I am waiting for the QMX. I mistakenly believed I could do digital on the mini, I was wrong. Concerning the QMX, I will wait for further instructions and any software updates for that radio.

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5

The QMX uses just a usb cable https://youtube.com/shorts/g7fTDiHRsXU?si=ifmyOE4ZMDxlrm0G

73 Ron

6

(post deleted by author)

7

The QMX internal sound card only supports single-tone FSK modes. Such as FT-8 and JS8Call. Multi tone modes such as psk31 and VARA requires a sound card interface such as the digirig.

I just completed my QMX build on Saturday. Unfortunately I am traveling for work the next few weeks. As soon as I can find time, I plan to sus out cables to use my digirig with the QMX. Primary use case is for Winlink.

8

i don’t have one so please double check

:slight_smile:

the manual states:

  1. Operating QMX on digital modes
    Operation of the QMX transceiver on digital modes is really simple. A USB-C cable is required
    between the PC and the QMX. Naturally you need a power supply and the antenna connection
    too. QMX must be set to Digital mode or USB mode, to be able to use the PC and QMX
    combination for digital modes! Press the VOL knob to change the mode on QMX.
    For FSK modes (WSJT-X modes including WSPR and FT8, JS8Call, RTTY, etc) be sure to
    use DiGi mode for best results.
    For non-FSK modes including phase shift modes like PSK31 and multi-tone modes like
    VARA, make sure you use SSB in USB mode.

so the sound card isn’t the issue concerning single tone fsk or multi tone, the mode selected is

the sound card is accessible in usb mode, as stated in the manual, so use that and you should be good to go for multi tone digital modes

the QDX on the other hand is purpose built for single tone fsk only

good luck

:slight_smile:

kb0wlf

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