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ringdown

6 photos tagged ringdown, from 1 member of Flickr Commons.

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Tags that often appear on the same photos:

• westernelectric
• 500set
• nondial
• red
• medical
• maintenance
• emergencyprocedures
• avprogram
• may1982
• rohrfactory
• dymolabels
• selcal
• 22
• analog
• tone
• selectivecalling

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• SDASM Archives 6 photos

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23_0066884 Convair Negative Image

from SDASM Archives

• Chuck Walla said:

  SELCAL is a contracted form of selective calling. It uses an international standard tone signaling system that is almost identical to a Motorola fire station alerting system called Quik Call. For over ocean operations, for example, it allows flight crew to mute the radio so it's not necessary to listen to aircraft hundreds of miles away. If air traffic contol needs to speak with you, the SELCAL lights and the radio buzzes or beeps.