Inconsistent branding strategies make it increasingly difficult for viewers to see the connections between PBS, the programs it distributes and the local stations that air them. PBS convenes a meeting with station communications execs at Braddock Place this week to discuss how to rectify the problem, a remnant of age-old tensions over what public TV should call itself. The pow-wow follows up on a study by the branding strategy and design firm Interbrand, which concluded that the profusion of public TV brands undermines the PBS brand’s ability to raise money from viewers and sponsors. Interbrand noted that cable competitors and successful nonprofits focus on national brands. The consultants estimated that the PBS brand is worth $5.4 billion, based on their assessment of its ability to secure loyal donors and influence funding decisions in the nonprofit sector.