LexMichdeappel Posted November 3, 2014 Share Posted November 3, 2014 I came across something I think is really awesome and I'm sure there are some of you you also are freaked out by this little gem. http://www.rtl-sdr.com/receiving-dead-satellites-rtl-sdr/ So there are sattelites up there that should have been crashed, but somehow didn't (because of comm failures and such) and are still beaming stuff around. Although these satellite’s batteries have long been expired, because of some sort of chemical reaction due to thousands of failed recharge cycles the batteries begin to conduct over time and allow the satellite to be powered directly from the solar panels thus activating the transmitter. Some more interesting stuff: http://mdkenny.customer.netspace.net.au/emitters.html Launched on 13 Dec 1964 as the second operational TRANSIT spacecraft, it should be more correctly called OSCAR -2, O-2 or NSS 30020. Unfortunately, the navigation system failed within 2 weeks of launch. The telemetry beacon can be CW or modulated depending on solar lighting conditions. The PAM data is 35 steps with a repeat cycle of about 12.5 seconds. Each step has a duty cycle of about 75% data value and 25% return to centre frequency value. These steps vary a 5400 Hz centre frequency sub carrier oscillator, IRIG 10, that then frequency modulates the RF carrier. Another SCO at 10.5 kHz, IRIG 12, is sometimes present. It has a pattern of five pulses with gaps, followed by a longer gap at about a 1.5 Hz rate. A SSB receiver will resolve, separately, the carrier as a single tone and each of the sidebands as "musical" tones. So this 50 year old piece of space "scrap" can still be heard! Hoping to see some more results coming in from other RF enthousiasts. ADS-B is for pussies! Quote Link to comment Share on other sites More sharing options...
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