Both. There was a "transmitter on" beep (that almost nobody heard), and there was a "transmitter off" beep that everyone heard - with about 100Hz difference in the two tone frequencies.
Read this: <http://en.wikipedia.org/wiki/Quindar_tones> What it doesn't mention is that there was an audio notch filter that took out the beep from the audio fed to the actual transmitter. Mike WA6ILQ (who worked at NASA -JPL in the 1970s, plus two additional contract gigs, one in the 80s and one in the 90s) At 08:02 PM 07/13/10, you 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 TransmissionDon KA9QJG Nothing if you're name is roger. Smile emoticon From: <mailto:[email protected]>Larry Horlick Sent: Tuesday, July 13, 2010 10:02 PM To: <mailto:[email protected]>[email protected] Subject: Re: [Repeater-Builder] Re: question for commercial radio shops Hey, what's wrong with a roger beep?....'beep'On Tue, Jul 13, 2010 at 9:56 PM, skipp025 <<mailto:[email protected]>[email protected]> wrote:
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