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

[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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[grooveclubhouse]

The "oven is cold"

[uploadJ]

@grooveclubhouse The "oven is cold"

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

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[Pincer88]

Is it wise to share this information? My guess is, you are making certain people wiser, than they should be.

[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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[uploadJ]

This may also have been a Customs Service P-3B AEW aircraft, since it also is equipped with the APS-145 UHF RADAR like the one on the E-2C Hawkeye aircraft. The rotation rate is spec'd to be 6 RPM or one rotation every 10 secs (matches time between maximum 'buzzing' amplitude in vid as timed with a stopwatch).

The 'main lobe' from the antenna is pointing at (us) the receiver, when the signal strength is maximum on the Spec An and the buzzing sound is strongest.