On 27 December 1987 , the exchange came into effect .
ADS - 7 , owned by the same owners as the main Network Ten stations , became ADS - 10 with SAS - 10 converting to SAS - 7 , operated by TVW - 7 in Perth .
On 27 December 1987 , the exchange came into effect and ADS - 7 , owned by the same owners as the main Network Ten stations , became ADS - 10 with SAS - 10 converting to SAS - 7 , operated by TVW - 7 in Perth .