Drove from Wodonga out to Koetong, then around to the Mt Lawson car park. Just before the car park, I used a chain to drag a large fallen limb partly off the track so that I could drive to the car park. Loaded up the gear and walked to the top of Mt Lawson VK3/VE-129. i set up the radio gear and made 30 contacts. Whilst on the summit, I heard what I thought was motor bikes. I packed up and walked back to the car. As I exitted, I noted that the tree branch hand been cut up and cleared from the track - the sounds must have come from a chainsaw.... I drove back to Koetong and the headed back to Wodonga.