141T/8555A Spectrum Analyzer showing ASR-9 RADAR sweeps plus detected sound, MVI_3200

Observed 3-11-2010 at 6:59 PM

Rotation interval is approximately 4.6 seconds measured using Sound Forge (h/t to cajunporkchop for pointing out an error in my prior maths). This translates to 13 RPM rotation rate (nominal ASR-9 rotation rate is published as 12.5 RPM.)

Interval measurement using Sound Forge, see image: http://i34.tinypic.com/2m69vfm.jpg

The IF (with HP8552 set for Zero Span) out of the 141T mainframe was routed to a receiver in AM detection mode receiving a frequency of 50 MHz (the 2nd IF out of 8555A/8552B plugin set) to allow the RADAR rep rate (repetition rate) to be audibly heard.

This was most likely the ASR-9 RADAR sited near Sachse, TX.

Frequency was approx 2705 MHz at the time.

See example of high-powered ship-board RADAR actively scanning (and affecting camera electronics):
http://www.youtube.com/watch?v=r2P-IW2q6aw

Airfield Surveillance Radar ASR-9:
http://www.radartutorial.eu/19.kartei/karte203.en.html

ASR-9 antenna picture:
http://en.wikipedia.org/wiki/File:ASR-9_Radar_Antenna.jpg

Video of ASR-9 antenna rotating:
http://footage.shutterstock.com/clip-102730-stock-footage-airport-surveillanc...

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Category:

Science & Technology

Tags:

• ASR-9 RADAR
• ASR-9
• ASR-11
• radar rep rate
• Sachse RADAR
• airport surveillance radar
• FAA
• RADAR

[uploadJ]

@cajunporkchop -

Mea culpa -

Thanks,

I updated the info section per actual measurements.

Regards, uploadJ

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[cajunporkchop]

Perhaps a typo, but an ASR-9's rotation speed is 12.5 rotations per minute, or once every 4.8 seconds, which is consistent with the video.