The Oakland Tribune reports that a city-commissioned study released Tuesday discovered that the system implemented last year is plagued by poor reception and audio and speaker problems.
Police union President Barry Donelan said officers have no confidence in it.
Officers and fire officials switched to the new digital system in June. The change comes after years of complaining about dead spots and malfunctions with the old, analog radio system.
The infrastructure and equipment cost about $18 million. Installation was funded by federal grants.
City officials are now working with consultants on cost estimates to fix it or join a regional radio collaborative.