Radio Frequency 8647
Radio frequency 8647 MHz is used in solar radio observations. A sample image of the Sun on February 25, 2022, was made with the 12-m radio telescope at the Arecibo Observatory at this frequency, showing intense emitting active regions and a coronal hole of quiet emission.
Additionally, there is a part number AM-7641U, which is a radio frequency amplifier with the NSN (National Stock Number) 5996-01-619-8647. This amplifier operates at frequencies above 20 kHz and increases the amplitude of radio frequency input signals