Aug 28, 2024 07:00:00 'Play a sound' allows you to test how many Hz your ears can hear. This article, originally posted in Japanese on 07:00 Aug 28, 2024, may contains some machine-translated parts.

The APSIN6000 portable RF signal generator specifies a phase noise -128 dBc/Hz at 1 GHz and a 20 kHz offset, harmonics of less than -40 dBc, and a resolution of 0.001 Hz from 9 kHz up to 6.4 GHz ...