San Diego may still be in the dog days of summer, but GOP mayoral candidate Carl DeMaio is quietly ramping up an all-out fall television blitz against his rival, Democratic congressman Bob Filner.

Commercial time sales contracts kept by local TV stations, which must be made public under federal law, show that the DeMaio camp has so far placed significant orders for commercial time at two local network affiliates.

It's still early in the race, and the candidates' so-called television buys can shift over time, but the early TV activity appears to play to DeMaio's campaign funding strength.

But the lack of Filner money on TV thus far may be only an indication that the Democrat will rely on independent TV expenditures by labor and other donors, some political insiders believe.

They point to the final weekend TV campaign against DeMaio during the June mayoral primary paid for by the San Diego Police Officers Association and the state's top law enforcement labor organizations, including the Los Angeles Police Protective League PAC and the Sacramento-based Police Officers Research Association of California PAC.

Whether or not other political advertisers enter the fray, multiple contracts for commercial time on file at the two stations show that the DeMaio forces plan to open their air battle with a volley of spots on KFMB, San Diego's CBS affiliate, and KNSD, the NBC owned and operated station here.

According to one $22,580 KNSD contract, dated August 15, the campaign will run spots starting on October 1 on shows including Wheel of Fortune, Jeopardy, and Law and Order.

Over at KFMB, one contract, worth $54,450, features spots near Good Wife, Face the Nation, Sixty Minutes, Anderson Cooper, and CSI:NY.