QRP Labs QDX-M firmware `v1_05`

QRP Labs · Released Sep 30, 2022 · First seen Sep 7, 2026

v1_05 is not the latest firmware for the QRP Labs QDX-M: the current version is v1_10 (July 19, 2023). Go to v1_10

In short — summary by updatemystuff.com

New Image sweep screen, 160m/630m band support, TX range 0.3-60MHz, and multiple fixes.

Written from QRP Labs's release notes, which are printed in full below.

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RF Sweep locks band settings and PLL divider, at the center frequency divider
Default Cyan colour for grid on AF sweep, RF sweep and Input analysis screens
Pressing . on AF or RF sweep changes the grid colour, like Input screen
Colour of the grid in each screen is persisted for the operating session
RF Sweep, addeed R to refresh current band (re-sweep)
Fix gain bug in RF and AF sweeps (should be fixed at 5000. not use the BandConfig value)
Proper log10 conversion to dB for sweeps etc
New Image sweep screen, sweeps and measures superhet image 24kHz down the band
Fix CAT AG command (audio gain)
Add CAT VN command (firmware version); read-only, VN; returns VN1_05_003;
VGA and VT220 terminal option by soldering wires to microcontroller pins
Added three new serial ports 1/2/3
AUX PTT - positive and negative PTT outputs independently controlled on TX and RX per band
Config screen now has "PTT Port as Serial 3" as enable/disable
Config and BandConfig screens don't stop radio operation now
TX disabled during Input Analysis screen
Press M in Input Analysis screen shows sub-window with CAT comms; and scroll only when signal present
Change TX limits from 1-30MHz to 0.3-60MHz
Version supports 160m and 630m (delay method of 90-degree quadrature generation)
Added "PIN fwd bias (mA)" to Band Config screen
Finalized SMPS control loop for Rev 4 PCB PIN diode forward bias buck converter
Update year to 2022 on firmware version in terminal

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