We have 4 SDR's at this location. Three of them are operating in multichannel mode which means they each can provide separate feeds over a 2.4 MHz chunk of spectrum...with the mix of frequencies in use at YSSY there had to be a casualty...as we try to include as many frequencies as possible on an initial deployment. So there had to be a casualty and 129.7 was the casualty. The other SDR scans Clearance Delivery and Ground, which we've never had coverage of and for which there is listener demand.