Why radar airships did not become the main AEW solution

Were blimps fitted with radar as early airborne-warning aircraft?

Perhaps experimentally, but high-flying heavy aircraft offered better control and precise positioning, so airships did not become the preferred solution.

Radar-airship experiments may have occurred, though the concept did not attract serious operational interest. Once heavy aircraft could fly at sufficient altitude, they gave commanders better control over where the sensor platform operated. Heavy aircraft were more maneuverable and could be positioned more precisely. A technically possible experiment therefore did not become the preferred operational solution.