The Takoma Park City Council last week unanimously approved an ordinance to adopt the Montgomery County cable television law and to join other municipalities in the county's agreement with a cable system.

"We could have set up our own cable franchise agreement, but we opted to go in with Montgomery County," City Clerk Sybil Pusti said. The entire city will adopt the Montgomery County law, although part of the city is in Prince George's County.

Montgomery County is negotiating a service contract with Tribune-United Cable of Montgomery County. The city will receive a percentage of the city subscriptions received by the franchise. The amount of return has not been set.

Although the city has yet to work out an agreement with the county to receive the cable service and equipment, Bruce Moyer, chairman of the Citizens' Cable Committee, said Takoma Park residents could be watching cable channels by mid-1984. Under Takoma Park's contract, construction for the service must be completed within 20 months after the county awards the cable contract.

Moyer said citizens will have the opportunity to subscribe to varying levels of service within the system, paying different amounts depending upon the number of channels they choose to receive.

In other business, the City Council:

* Heard residents' suggestions on how to spend $80,000 in federal revenue sharing funds and on next year's $3.5 million city budget.

Among the requests were a full-time animal warden, better street lighting, new public trash cans and a tree committee. Takoma Park had a part-time warden, but funds for the post were eliminated two years ago.

* Established a process for the Historic Preservation Committee to review housing rehabilitation grants in the city's two historic districts. The purpose is to ensure that exterior construction complies with plans for the districts.

* Set up a search committee for a new police chief, following the resignation of Steven Carter last month. Members are Mayor Sammie A. Abbott, council members Frank Garcia and Herman Williams, City Administrator Alvin Nichols, Montgomery County Police Chief Bernard Crooke and five residents. They will try to find a new chief by June or July, Pusti said.

* Approved an agreement hiring the firm of Gagliardo and Silber as counsel for the city at a cost of $25,000 a year.

* Adopted a resolution commemorating Black History Month.