This page will contain some modifications to QMX by enthusiastic owners! Note that the QMX is a very compact transceiver, there isn't much space inside at all. Any modifications will be risky! So bear that in mind, while you contemplate... 

Contents:

Real Time Clock (RTC) for QMX by Wolfgang OE3WHU

Real Time Clock (RTC) for QMX by Wolfgang OE3WHU

QMX+ has a battery backed RTC, but QMX does not... until it met Wolfgang OE3WHU:

Hi QMXies.
As a sota enthusiast i was missing a working clock (on the QMX .. not QMX+) regardless if batteries have been removed before. There is everything there also in QMX, but the 32kHz Q and the buffer battery.
I (carefully) released pins 6, 8, 9 of the STM32 from the PCB, soldered 3 thin wires to the elevated pins ant fixed them with epoxy glue. Then attached a 32kHz Q to 8 & 9 pin wires.
As i don't need the PTT output for sota, i removed the PTT connector, which made room for the CR2016, attached to pin 6 wire.
Settings "real time clock" set to QMX+ RTC and "set time" -- voi la. Now the RTC keeps on running while QMX is in his transport box without any power attached :-)
I have to confess, you need some skills in working with very small soldering tips under the microscope, as the pins of the STM32 are really close together. Solder bridges don't have to bring you out of concept ;-)  

Hans note: I believe Wolfgang means a 32.768 kHz crystal, the standard type of crystal used in watches (and indeed, also in the QMX+!).