Folks, The VHF ISS digipeater I understand is off air due to equipment failure. I believe they have moved it up to 70cm until a replacement can be flown to ISS in late 2017. http://forums.qrz.com/index.php?threads/aprs-by-iss-space-station-down-now-on-uhf-band.543402/ 437.550MHz The Doppler shift is going to make it hard for unattended gateways... Grant VK5GR