There is no spacewalk-admin package in F16, but spacewalk-backend-tools requires it. You can therefore not install spacewalk-backend-tools successfully. Please create a F16 build or correct the Requires.
Can you please look into that?
spacewalk-admin-1.8.3-1.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/spacewalk-admin-1.8.3-1.fc16
spacewalk-admin-1.8.3-1.fc16 has been pushed to the Fedora 16 testing repository.
spacewalk-admin-1.8.3-1.fc16 has been pushed to the Fedora 16 stable repository.