# Apollo Spacecraft S Band Communication System, Part 24—Interface Simulator

**URL:** <https://scanalyst.fourmilab.ch/t/apollo-spacecraft-s-band-communication-system-part-24-interface-simulator/2431>\
**Category:** Continuity\
**Tags:** apollo, simulator, communications, space\
**Created:** [11 December 2022 13:50 UTC](https://scanalyst.fourmilab.ch/t/apollo-spacecraft-s-band-communication-system-part-24-interface-simulator/2431 "2022-12-11T13:50:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![johnwalker](https://scanalyst.fourmilab.ch/user_avatar/scanalyst.fourmilab.ch/johnwalker/32/17415_2.png) [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Post date:** [11 December 2022 13:50 UTC](https://scanalyst.fourmilab.ch/t/apollo-spacecraft-s-band-communication-system-part-24-interface-simulator/2431/1 "2022-12-11T13:50:26Z")

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[![](https://scanalyst.fourmilab.ch/uploads/default/original/2X/f/f8f0902af00aec002f3bb6ae8c803e78a8db9e48.jpeg "Apollo Comms Part 24: Interface Simulator bring up") ](https://www.youtube.com/watch?v=08RBYePw5mA)

Not only was the Apollo space to ground communication system extraordinary complicated and composed of numerous intricately-related parts, the need to simulate everything on the ground before committing it to flight required additional piles of purpose-built test equipment that reproduced the conditions of a deep space mission. More than a year into the Apollo communications project, the intrepid restorers take on a simulator which combines the various signals transmitted to and from the spacecraft into the complex modulated signal transmitted by the antennas.