And when he is finished talking and releases the button again, a slightly lower outro tone (2.475KHz, sine, 250ms) is generated to trigger the ground station transmitters to turn off. Someone was supposed to monitor the circuit and if the audio dropped, but the “transmitter on” light was still on, they would have to manually unkey the transmitter.
Quindar tones are named after the manufacturer of the tone generation and detection equipment, Quindar Electronics, Inc. Quindar Electronics is actually still around today, under the name CG Automation, in Springfield, NJ.
Also, just before communications was handed over to a new tracking station, the key-unkey tone pair was sent 10 times to ensure that everything was functioning correctly. Thank you!
// create the gain node, and set its gain to an appropriate value// connect the oscillator to the gain and the gain to the output// we detect the mouseup event on the window tag as opposed to the button// because otherwise if we release the mouse when not over the button, Yesterday, my family watched the successful launch of the As astronauts Robert Behnken and Douglas Hurley communicated with Mission Control, we heard PTT confirmation beeps after each transmission.Those beeps, of course, reminded me of past NASA missions and those iconic confirmation tones we heard in audio from the Mercury, Gemini, and Apollo days all the way into Space Shuttle missions.I couldn’t find any information about Quindar Tones at the US Space and Rocket Center–although, admittedly, the place is “I’ve always wondered what purpose the ‘beeps’ served that one heard intermittently during the voice communications with the Command and Lunar Modules during the Apollo missions, as well as other space missions.”Journal Contributor Mike Dinn provides an MP3 clip ( “‘Other space missions’ is quite an accurate observation, since the ‘beeps’, in fact, are still in use today on Shuttle flights, at least on the UHF frequencies.”“These beeps are called ‘Quindar-Tones’.
This means that by clicking on these links, a small percentage of the purchase price for goods you purchase from these sellers will help support our site’s running costs. This was done before the audio was patched to the tracking station’s line so it wasn’t heard in the control room or on NASA Select audio.The Quindar system was actually built from a piece of equipment that was used to put multiple teletype circuits on a single phone line by means of frequency domain multiplexing.
This system uses a continuous tone that is below the normal audio frequency range. Even though you won’t hear the same Quindar tones in present-day space missions, you can listen until your heart is content at the website Apollo In Real Time. To recreate this in Web Audio, we'll first make a Quindar object that will contain all our methods and functions.
They are known as Quindar tones (named after Quindar Electronics, Inc - the manufacturer of the tone generating equipment) and were used by NASA as part of a system designed to turn on and off transmitters on Earth, enabling CapCom (based at mission …