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Quindar tone generator


To recreate this in Web Audio, we'll first make a Quindar object that will contain all our methods and functions. A High-Quality Web-based Audio Frequency Signal Generator.

a roughly period-correct Quindar tone generator rack-mount unit Photo: eBay. Our initial properties will be an AudioContext (essential for creating and hearing our oscillators), the 2 frequencies needed for our tones, and a variable The system consisted of an intro and outro tone - each one a single sine wave lasting 250ms. So, the Quindar tone generator, which was still installed in case it was necessary to key the transmitters at an overseas site, was re-enabled.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 If you’re fascinated with the NASA audio soundscape in general, you might check out the electronic music duo Quindar: Mikael Jorgensen & James Merle Thomas. So, the Quindar tone generator, which was still installed in case it was necessary to key the transmitters at an overseas site, was re-enabled. To prevent this there was a “transmitter on” light at each remote site that would come on when the transmitter was keyed. 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. When the button was first pushed, the intro tone would be sent, then you would speak your message.
Because replacement parts are no longer available, an “out-of-band signaling” system was installed in 1998 for the transmitters located in the U.S.

Generate sine waves, sweep tones, noises and other sound test waveforms, online! // 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, When the tone is not present, the transmitters are unkeyed. This system uses a continuous tone that is below the normal audio frequency range. Now we need some way of playing the tones, and for that we'll create a method called VOX is used when they don’t necessarily have their hands free. 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.

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.

If the transmitter was keyed and the telephone line connection broken, the transmitter would never get the tone to turn off. So, on the
The Quindar receive modules had a notch filter that removed most of the keying tones from the S-band uplink.

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