Its function was to oversee various Australian government programs relating to the
broadcasting of ABC and SBS television and radio programs within Australia and of
ABC Radio Australia on
shortwave internationally. This was done primarily through administering maintenance and equipment supply contracts. The NTA's funding agreement with the Department of Finance required it to meet savings and performance targets. It had to do this while maintaining the integrity and reliability of the
transmission facilities themselves. During the life of the NTA, it moved from exclusive reliance on
Broadcast Communications and
Telstra towards a process of competitive
tendering to provide its broadcasting services. A significant source of extra funding to the NTA was "site-sharing" of transmission facilities with commercial broadcasters,
telecommunications companies and
emergency service communication networks. This site-sharing meant that NTA facilities were made available in return for payment. ==Review and privatisation==