Wouxun KG-UV3D GPS+Voice Interface: Electronics

The latest version of the GPS+Voice electronics for the Wouxun KG-UV3D, which I’m getting ready to build:

Wouxun KG-UV3D GPS+Voice Schematic
Wouxun KG-UV3D GPS+Voice Schematic

A few changes:

  • It runs from those 9 V boosted packs, not 7.4 V direct from their lithium cells
  • U2, the MAX4544 data/voice mux, runs from the shunt-regulated +5 V, not the TT3+ regulator
  • Miscellaneous doc cleanup

I’m mulling over a capacitor between the TT3+ data output and the earbud, so as to monitor transmissions, but I’m not convinced that’s worthwhile.

The PCB layout, with wire jumpers on the two inner layers:

Wouxun KG-UV3D GPS+Voice PCB
Wouxun KG-UV3D GPS+Voice PCB

The previous version doesn’t look much different from what this one will become:

GPS-HT Wouxun interface - brassboard
GPS-HT Wouxun interface – brassboard

This will replace the ICOM Z-1A radio and GPS interface on Mary’s bike, which has been working fine for quite a while. That can’t last, so I’m trying to get ahead of the failure curve…

The Wouxun HT GPS+Audio Interface schematic and PCB layout files, both tucked into a ZIP file with an ODT extension. That is not an OpenDocument file: rename it to remove the ODT extension, then unzip it.