LORAN’s heart was its timing unit—a crystal oscillator that allowed a receiver on an aircraft, ship, or submarine to measure the difference between “master” and “slave” radio pulses. Early LORAN equipment was sensitive, and operators had to monitor it carefully, especially in areas with salt air and high humidity, which rapidly corroded components.
Caption:
It contained a crystal ocillator and was key to the LORAN system.
Type: Photograph
Credit: National Archives and Records Administration
