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james_screech

First radio meteor observations

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Success at last, I'm reasonably sure these are actual meteor scatter from Graves.

event190317003239.jpg.fba8b1a0b92c976e512fd927be1822ef.jpgevent190317013856.jpg.59cfdeff2e3406d27c3a23bb68b3d513.jpgevent190317025140.jpg.48394b551d250bcb12712964eef6235a.jpgevent190317055359.jpg.9755eefdd0c32418fc04001cf694e945.jpgevent190317062102.jpg.ac0c0b7e51935f9d4f32ce291f4bbc25.jpg

 

Though I'm also getting a slowly drifting signal a lot of the time, no idea what it is. Not the Moon as it isn't up visible for too long for an aircraft and too frequently for the ISS.

event190317064831.jpg.572cffab4c039736995b85a929787267.jpg

 

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The certainly look like Meteors to me. I well remember the excitement of my first "blips", excitedly pointing at the screen and wife's response.  " That's very interesting but what would you like for tea..........."

Regarding large space junk or the ISS reflections, The radar sweeps across the sky so you should get a series of "blips" that slowly descend in frequency and the timings can be checked using ClearOutside and other web sites. Perhaps others have suggestions as to the slowly descending signal

 

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Posted (edited)

Congrats on the detections!  They look similar to the small, short duration, echoes that I see as background strikes.

The slowly drifting signal is very likely a local source, not a reflection off GRAVES.  The GRAVES Radar switches azimuth every 2 seconds or so, giving you interruptions or transitions in the signal.  These transitions can lead to aliasing in the trace giving rise to spikes at each transition.  Your continuous signal doesn't have any of these characteristics, strongly suggesting that it's a local radio source.

I receive a number of these local sources.  One particularly noticeable source actually comes from my computer monitor.  Switch the monitor off and it goes away in SDR#.  Another source is from my neighbour's heating system - I suspect their heat exchanger or similar: it's a regular source occurring at timed intervals and more noticeable on colder winter nights than during the day.

The ISS or space junk exhibits a noticeable Doppler shift and looks very different.  Here's an example of the ISS, plus my computer monitor:

1290756518_Satellite24thSept20181820UTC.png.d2b48940c1826f445b40d20be2c43fab.png

 

There's not much meteor shower activity just now, so it's a good time to build a system based on background activity, then you can compare when the next shower comes along.

There's several threads here with people experimenting with different systems, algorithms, antennas etc., plus some discussions about the nature of the detection too.  Enjoy!

Richard

Edited by BiggarDigger
Clarification that the ISS is not space junk!

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