VE7ZAX QMX Buddy Back non-destructive rear case to make room for your mods.
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QMX Buddy Back Case non-destructive replacement for rear of case. Fast swap to allow room for your add-ons.
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QMX Buddy Back Case non-destructive replacement for rear case panel. Quick to swap with existing screws to allow room for your mods. Use your slicer or cad to poke holes in where you want them. Maintains the nice aesthetic of the QMX.
I wanted to have an integrated speaker and batteries so I made a quick replacement for the rear case of one of my QMX radios. I've included five depths of generic cases so you can find one large enough to fit whatever you want. Sadly I realized I should have noted measurements when doing them after I was done. The Standard Size has internal space of approximately 58.5mm x 92mm x 9mm. This doesn't include the protrusion for the screws and inner case mating edges but gives an idea of which size to try out.
Update: @Lance_4967819 properly measured the cases as follows. Thanks Lance! Check out his wonderfully documented build.
X-Shallow: 5 mm
Shallow: 10 mm
Medium: 15 mm
Deep: 20 mm
X-Deep: 25 mm
I've added my first specific case which fits 3 x LiPo cells, a BMS, and a small speaker as an example.
-28mm 32ohm mylar speaker - Aliexpress
-3 x 782052 1000mah LiPo cells - cheap on Temu
-3S mini BMS from Aliexpress
-Plastic DC power jack from parts bins...
I'm loving the tidy compact setup with integrated battery and speaker. Did the 10W mod and am limiting the power from the BMS to 12V with the latest QMX firmware as of June 2026. The speaker is un-amplified but I find it loud enough to use in a quiet environments. Headphones are always an option. I connected wires to the pins for jacks on the underside of the PCB inside the radio to allow inserted headphones to disconnect the speaker, same with DC power plug to disconnect the internal battery. BMS is charged from a separate jack. Makes for I nice clean setup. I only need to connect a key and an antenna.
I'm already planning a some different additional mods for my other QMX. Wanted to try an integrated touch key but never wanted to commit to making holes in the nice stock enclosure to try them. Will be giving that and an integrated mic a try next…
Hope somebody else finds it useful and thanks for any likes and downloads.
73,
VE7ZAX