With new methods of telecommunications (i.e. By using our Services or clicking I agree, you agree to our use of cookies. I don't, for example, think it's required to talk to Dragon... but they like it so you don't always have to flap your lips. my thinking is.. what if it's a rest period and the astronauts are asleep that ping is an active signal that you still have comms. Here is a link to an article about it.
(The crews back during Apollo – and also today – usually communicate via PTT as well, but they also have the so-called ‘VOX mode’ at their disposal, in which their microphones are voice-triggered by a certain adjustable threshold volume levels. When the tone is present, the transmitters are keyed. One way communication is still a big feature on safety critical vehicles like Trains and Planes, in the case of Trains(In the UK at least) all emergency calls are still made with one way push to talk systems so that whoever is talking can get their message over uninterrupted.
Thank you!
I found this archived post on the NASA’s Apollo Lunar Surface Journal wesbite: Journal Contributor Mark Burckhard writes: “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.”.
If the transmitter was keyed and the telephone line connection broken, the transmitter would never get the tone to turn off. Photo by Chad Ress, Spacesuits by Cassandra C. Jones. CCD Spectroscopy: How these Spectra were Taken, https://regulusastrocom.files.wordpress.com/2018/09/quindar_tones.ogg.
The name “Quindar”? The tones were used as a method to control when the remotely located transmitter was transmitting, and used the phone lines to send these remote control tones as audible beeps. Based on a simple Wiki search, Quindar tones were used for a PTT (Push To Talk) mechanism to transmit signals. List of QRP General Coverage Amateur Radio Transceivers, List of VHF/UHF Multimode Amateur Radio Transceivers, NASA’s Apollo Lunar Surface Journal wesbite, https://swling.com/blog/wp-content/uploads/2020/05/hskquindar.mp3, https://www.podtrac.com/pts/redirect.mp3/media.pri.org/s3fs-public/science-friday/segment-audio/scifri-soundtrack-spaceflight.mp3, The SDR.hu web SDR portal is no more, but we have several excellent alternatives, Kort radioamateurnieuws - week 23, 2020 - VERON, Grace Digital Internet Radios made between 2007 and 2017 “will stop working”, Dan’s initial review of the Belka-DSP portable shortwave radio. I obviously can’t speak on behalf of NASA but I really wouldn’t be surprised if certain important conversations were had on a one way channel.
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