Had a Member of the Group send Me a Link direct , I thought I would share it then We can get back to repeater Building before We get hollered at lol
http://www.hq.nasa.gov/alsj/quindar.html Don KA9QJG From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff Lavoie - KB1SPH/WQEX694 Sent: Tuesday, July 13, 2010 10:23 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: question for commercial radio shops That makes sense. I wonder if the ground crew could trick the ground receiver into un-muting the audio from the shuttle so that they can listen in on what's going on. Jeff, KB1SPH / WQEX694 -------------------------------------------------- From: "Martin Flynn" <mafl...@theflynn.org <mailto:maflynn%40theflynn.org> > Sent: Tuesday, July 13, 2010 11:16 PM To: <Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > Subject: Re: [Repeater-Builder] Re: question for commercial radio shops > Spacecraft systems are full-duplex. The purpose of the "Quindar tones" > was to mute the uplink audio when Houston had nothing to say. > > ka9qjg wrote: >> >> >> Meant a lot to the First Astronauts with Communications that is how >> it got started I think , I forget if it was a Pre or after Transmission >> >> Don >> >> KA9QJ _