Ultrasonic Interference with Electromagnetic Waves? I am currently working on ultrasonic frequencies (20 kHz-60 kHz). According to a news snippet I found:


  The state government has also tried employing ultrasonic guns that can scare monkeys away and create van vatika or small sanctuaries for different troops. The plan to use ultrasonic guns, which cost Rs 20,000 each, was shelved after municipal officials said the ultrasonic frequencies jammed phone and internet services. 


stated that the Ultrasonic Guns jammed up phone and internet services. 

Aren't Ultrasonic (Mechanical energy) and Phone / Internet transmissions (Electromagnetic energy) completely different in nature and operate on different spectrum? Ultrasonic waves they might have used might go up to 100 kHz, while the Internet (2.4 GHz) and mobile systems (GSM: 900 MHz and above) are in completely different spectrum. Is this possible?
Not sure about up into the GHz ISM bands, but unfiltered, unshielded switching power amplifiers and power supplies running at high audio frequencies can generate and radiate harmonics well into the RF HF bands.