Representatives from Hamilton, Round Hill and Purcellville will meet tonight to discuss plans for their joint effort to bring cable television to the three western Loudoun County towns.

Tonight's meeting, at nine o'clock in the Round Hill town office, will be the first gathering of town officials since each town council earlier this month adopted a resolution agreeing to work together on the cable television project.

Under the resolution, each town agreed to appoint one or two officials to a cable television committee.

Committee members will be "getting organized and getting our ducks in a row to prepare for getting invitations for bids. . . . We've had continuing interest over the last few years, with companies offering to provide it for us," said Purcellville Mayor Ronald M. Masters. "I think generally the people in town are receptive to having a wider range of selection for their televisions."

If the effort is successful, the three towns' combined population of 3,000 will be able to join residents of Leesburg in adding cable channels.

Leesburg, the first and so far the only town in Loudoun to have cable television, negotiated a franchise agreement in 1980 with Storer Cable Communications of Leesburg.

In May 1983, Loudoun County negotiated an agreement with Cable Communications Corp. (CCC), a locally owned corporation based in Sterling Park, for the county cable franchise.

So far, CCC has installed cable television in about 3,100 homes in eastern Loudoun, according to CCC staff, and will offer installations in rural areas of the county as the population there increases. The CCC franchise does not apply to the county's seven incorporated towns.

Cable Communications Corp. is among several companies that have approached Round Hill, Purcellville and Hamilton about cable television. "We're waiting for the towns to adopt an ordinance and issue a request for a proposal," said CCC president Ken Chamberlain. "We plan to bid on that."

Round Hill Mayor Jeffrey Wolford said the committee meeting tonight will discuss hiring an outside consultant for advice on writing each town's franchise agreement.

"One of the first things we have to decide on is whether we're going to need some help on it as far as putting the package together," said Wolford, who is a member of the cable committee.

Wolford said that in Round Hill, as in Purcellville and Hamilton, there has been steady, though not overwhelming interest in the prospect of cable television.

"If it got there tomorrow that would be fine; if it got there a year from now that would be fine. It's just something they're interested in," Wolford said.