Thanks Leo -EA7KB There's a jumper on PIN 5 of Arduino (digital board), hope we can replace jumper with 4.7K resistance (only if PTT still works)... Otherwise we need to cut a small trace ( with surgical hobby knife or shaving blade) scratch remove green-solder-resist-mask & install 4.7 K on back side of MAIN PCB. On 05/02/2014, Leonardo Ramirez <ea7kb@xxxxxxxxxxx> wrote: > Hi guys. > In Main board pcb must be added the base resistance of q23 . > Regards. > > Leo / EA7KB > > > -- -- Please encourage recycling, reuse or repairing of E-waste. ░7░3░ ░d░e░ ░V░U░3░S░X░T░