(CNN) US investigating possible mysterious directed energy attack near White House

(CNN) US investigating possible mysterious directed energy attack near White House. Quoting CNN,

Federal agencies are investigating at least two possible incidents on US soil, including one near the White House in November of last year, that appear similar to mysterious, invisible attacks that have led to debilitating symptoms for dozens of US personnel abroad.

A bookmark with links to 16 articles: (CNN)’Sonic attacks’ suffered by US diplomats likely caused by microwave energy, government study says. I am one of the dissenters to the microwave theory.  The White House is a particularly unlikely locale for a microwave attack.

Near the White House, the radio spectrum is subject to intense monitoring, in search of electronic espionage bugs that might communicate with nearby controllers. The surveillance receivers are very sensitive, because bugs transmit weak signals. At least some information from these receivers is recorded.

A microwave attack near the White House would inevitably leave a trace in the record of a surveillance receiver, either through direct detection, or inter modulation products. The microwave power levels required of a weapon tend to leak into  monitoring receivers,  leaving  traces, even if not by design.

A decade ago, it might have been possible, if the adversary had detailed knowledge of the monitoring equipment. But in the ’90’s, a chip innovation, the flash A/D converter, combined with software radio,  allowed monitoring, and recording the entire radio/microwave spectrum simultaneously, with no tuning required. This technology is now widely deployed.The equipment is surprisingly compact.

The electronic records of the surveillance receivers should indicate anomalies simultaneous with the presumed attacks — unless the discrimination software discards them as noise.

If you’d like to get started with detecting microwave weapons, you need 32 bucks:  NooElec USB Stick. It tunes up to 2.3 gHz, but should be sensitive to overload/intermod birdies at much higher frequencies. If one had been operating near the Ellipse, it would have blown the whistle.

If there are no indications, ultrasound might be worth another look.