analog

35 photos tagged analog, from 3 members of Flickr Commons.

When were these photos taken?

1
1900
1915

 

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None of these photos are geotagged.

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The last upload was November 2025.

Conversations

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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.

26_0052078 Rohr Collection Image

from SDASM Archives

  • Chuck Walla said:
    At the time this photo was taken, NASA/JPL ran a backbone of analog Collins single-sideband multiplex microwave radios. The microwave hops interconnected buildings at the site. You can see the antennas in this photo.

The Gap, Blackheath

from Powerhouse Museum

  • antirka (away) said:
    lovely place
  • imstephengoodman said:
    oooh i love this, looks like an amazing place
  • Ilaria said:
    Magic atmosphere... Beautiful!
  • Dennis said:
    very nice

L. Rothier (LOC)

from The Library of Congress