E-2C Hawkeye APS-145 RADAR Scanning shown on Spec Analyzer, Freq 447 MHz, MVI_3190

Observed 3-11-2010 5:34 PM

Equipment: HP 8591E Spectrum Analyzer connected to outside gain UHF antenna

Audio was taken from a receiver set to 447 MHz, AM mode (and squelch open) using built-in whip antenna

Rotation rate appears to be 9.8 to 9.9 seconds (rotating Radome on E2C Hawkeye mini AWACS aircraft) or USCS P-3B AEW aircraft.

See also this video which shows the effect on an FM signal when a remote repeater is keyed up: http://www.youtube.com/watch?v=aEYXNLBskMo

AN/APS-145 Advanced Early Warning UHF Airborne Surveillance Radar
Video at website: http://www.lockheedmartin.com/products/APS145/video.html

E-2C: http://www.naval-technology.com/projects/hawkeye/

E-2D: http://www.flightglobal.com/articles/2008/02/04/221269/northrop-grumman-to-be...

Tour of an E2-C, including showing the RADAR display:
http://www.youtube.com/watch?v=I3dVuNHXyV0

See example of shipboard RADAR scanning:
http://www.youtube.com/watch?v=r2P-IW2q6aw&feature=related

Note: The 420-450 MHz UHF ham band in North America (USA) is shared with Military RADARs like the APS-145 and others.

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Category:

Science & Technology

Tags:

• APS-145
• Ham band RADAR
• RADAR interference
• E-2C RADAR
• P23B RADAR
• P-3B AEW
• HR 607
• Peter King
• HR607

[MrIab92]

where did u get this?



[uploadJ]

@MrIab92

You probably know that access to that kind of information can only be divulged to:

(1) persons who are appropriately cleared (32 CFR Part 2004.7a) and

(2) also who have the legitimate "need-to-know" (32 CFR Part 2004.3b) ...

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[MrIab92]

@uploadJ then y is it on youtube?

[uploadJ]

@MrIab92 "then y is it on youtube?"

You're now asking a different question than "where did u get this?" ... are you familiar with the concept of the creation valuable information when 'gathered in the aggregate' vs individual non-associated 'points' or tidbits of info spread around?

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[AvignonMimi]

Your VBW video bandwidth is way too narrow to determine center frequency.

[uploadJ]

@AvignonMimi "Your VBW video bandwidth is way too narrow to determine center frequency."

But, one would see just one large, pulsed 'peak' in the sweep near the center of the CRT ... whereas this shows a little more detail, e.g. the energy spread over at least 500 kHz worth of radio spectrum.

Consider this as the perspective as 'seen' by a communications receiver with a 3 kHz bandwidth (BW). Verily, the audio heard is taken from a narrow BW AM receiver tuned to about 447.5 MHz.

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[uploadJ]

@grooveclubhouse The "oven is cold"

Nice catch; by :20 in the video it has "warmed up".

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[grooveclubhouse]

The "oven is cold"

[uploadJ]

@Pincer88

This 'mode' that has affected ham radio UHF repeaters on and off for more than a decade that I can remember, so on that basis I think it is more of a service to make the source known and remove the confusion this 'noise' causes when hams hear it on their local (or networked) repeaters.

There are other modes that are not so detectable that I'm not making mention of ... although if you are clever enough you can put two and two together and draw conclusions ...

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