ON AND OFF THE AIR:
* Don't know your Tsongas from your Harkin yet? Unclear on the divergence of views between Duke and Buchanan? CNN's "Inside Politics, '92," a new daily half-hour program devoted exclusively to political news of the 1992 election year, may help.
Anchored by Bernard Shaw in Atlanta and Catherine Crier in Washington, the show can be seen at 4:30 p.m. beginning today, with nightly repeats at 12:30 a.m.
The all-news network's political director, Tom Hannon, says the intent of the campaign chronicle is "to help voters reclaim the political process."
The CNN political team to be seen includes Ken Bode, William Schneider, Jack Germond and David Broder.
* Speaking of political coverage, here's a great line from Dennis Miller, noted last week in this space as a sharply topical comic:
Saying the average "sound bite" on network news reports might be as short as eight seconds, Mr. Miller said of Republican candidate David Duke, "that would let him give all his views and have, oh, four or five seconds left."
* Country singer Wynonna Judd is scheduled to make her debut as a solo performer, without ailing mother Naomi, on tonight's "The American Music Awards" show from Hollywood (at 8 o'clock, WJZ-Channel 13).
* If you missed it the first time around last fall, "Columbus and the Age of Discovery" can be seen over the next two nights on Maryland Public Television (at 8 o'clock both nights).
The PBS series puts the achievements of the great navigator in nice historical perspective, with some vivid re-creation footage of the truly remarkable voyage he made in tiny ships.
* Turning back the TV clock: Karl Malden returns tonight (at 9, Channel 2) as detective Mike Stone in "Back to the Streets of San Francisco." Original co-star Michael Douglas is not in it, but Darleen Carr returns as Stone's daughter, Jean.
The original series ran from 1972 to 1977 on ABC.
* CLARIFICATION: The cable service Nostalgia Television, which Media Monitor reported Friday as having been added to Baltimore County's Comcast cablevision, is not viewable at all hours by all subscribers.
The cable carrier says Nostalgia shares Channel 45 with the Playboy Channel and can be seen daily from 9 a.m. to 8 p.m. Playboy's premium service resumes nightly at 8, and non-subscribers see a scrambled signal on that station.
Further, only subscribers who have new "addressable" converter boxes can tune the channel. However, subscribers with older converters may exchange them free at Comcast offices in Catonsville, Towson and Essex, or by calling 252-1012.