This machine cannot receive signals at 24 hmz, but the aviation band works well. If you need to use less than 24 hmz, please choose other bands.This receiver has been upgraded to adopt the latest RTL2832U+R820T2 solution, which uses the Q channel on the RTL2832U to increase the direct reception of 100KHz-24MHz frequencies. It realizes the full-segment reception of 100KHz-1.7GHz.[The R820T2 tuner has slightly better sensitivity than the R820T, lower background noise, and higher signal-to-noise ratio. It can work more stably at frequencies around 1.5 GHz. ]It can be connected to computers, Android phones and other devices to use SDR software, receive electromagnetic waves from 100KHz-1.7GHz, and support AM, FM (NFM, WFM), CW, DSB, LSB, and USB demodulation. It can listen to shortwave single-sideband communications, FM broadcasts, walkie-talkie conversations, aviation bands, etc.The software can be used to crack analog sub-audio and digital sub-audio. Automatic search and scanning can be set. The software can be used to crack the ID of common digital walkie-talkies and demodulate voice signalsTechnical features of direct sampling RTL.SDR: The whole machine is provided and can be used after connection; using RTL2832U+R820T2 chipset, r820t2 tuner has slightly better sensitivity than r820t, lower background noise, and higher signal-to-noise ratio. It can work more stably at frequencies around 1.5 GHz. ; 100KHz-1766MHz, operating frequency range; covers all shortwave amateur bands;VHF and UHF bands cover from 24-1766MHz; the widest sampling rate is 3.2MHz. (2.8MHz stable); receiving modes include NFM, FM, DSB, USB, LSB and CW, note: depends on the SDR software used; 8-bit ADC sampling provides up to 50dB dynamic range; 50 ohm input impedance; dual SMA gold-plated antenna connector; aluminum shielded shell, blue oxide layer on the shell, laser engraving, fine appearance processing; small size; use free software; independent antenna input ports HF and UV; USB computer connection (powered by USB); very high dynamic range.