Here's the tiny mic that I've been using with my (tr)USDX and now the QMX. It's really simple to put together - I took an old mobile phone headphone that had an in-line mic and push-switch and simply removed the headphones and re-wired the switch and mic element as per the QMX/(tr)USDX specs. It works surprisingly well and weighs next to nothing.... Perfect for SOTA etc.?
( link, for when the in-line image disappears: )
