* Cable: In a deal that will...

* Cable: In a deal that will benefit from the North American Free Trade Agreement, Mexican cable television operator Grupo Mexicano Telecab has entered into a joint venture with Los Angeles-based Falcon Cable TV, San Francisco investment banking firm Hellman & Friedman and Midwest cable operator Duhamel Broadcasting Enterprises. Grupo Mexicano Telecab will expand using an infusion of $20 million a year from 1994 to 1998. Falcon Cable, Hellman & Friedman and Duhamel Broadcasting will be minority shareholders in the company. Falcon Chairman Marc B. Nathanson said NAFTA represents a major boost for the deal because equipment and technology used by Grupo Mexicano Telecab--which must be shipped from the United States--will now be 30% to 35% cheaper.