The following are simulated sounds for the Silver Lake low-frequency radio. The range station—located about 10 miles north of Baker, California—would preempt the navigational signals every 30 seconds to transmit its Morse code identifier ("RL"). The station identification would be heard once or twice, possibly with different relative amplitudes, depending on the aircraft location.[1] Pilots would listen to and navigate by these sounds for hours while flying.[2][3] Actual sounds contained "static", interference and other distortions, not reproduced by the simulation.[4] Adjusting the volume would affect the effective course width.[3] For example, in the simulated sound for "twilight" A below, where the aircraft is nearly on the beam but slightly inside the A quadrant, a low volume almost obscures the weak A sound, whereas a loud one makes it more distinct.