Скачать или смотреть 40.670 MHz SNOTEL Coming In Full Scale! VHF DX Low Band VHF Skip 20 January 2023

40.670 MHz data great indicator of VHF low band opening data transmissions on 40.67 MHz 40.675mhz 40.665 40.670MHz 40,670. US Government data telemetry system Rocky Mountains and Western United States.

Other indicators include:

Traffic signal control data (poly-tone data signal, AFSK-FM, sounds like ROS mode) - FRANCE - French traffic signal control radio signals 31,325 31,6875 31,975 FREQUENCIES BELOW

31.325 MHz
31.6875 MHz (or 31.685 MHz or 31.690 MHz)
31.975 MHz

YSD radio beacon CYSD Canadian military base radiobeacon heliport transmits Y S D in Morse Code / CW (MCW) followed by a tone burst.
36.600 MHz FM 36.6 MHz 36.6mhz 36.6000FM 36.60 MHz 36.60 FM 36,600 beacon VHF low band beacon early warning VHF LOW DX 36.600 MHz 36.6000 CSQ FM

36.600 MHz YSD beacon 36.6 FM


UK and European hospital pagers - POCSAG mode - there are plenty of these in the 26.15 MHz to 26.95 MHz range and 27.45 MHz to 27.95 MHz range and on 29.750 MHz, 29.800 MHz, 29.850 MHz 29.900 MHz and 29.950 MHz
VHF - low band UK on-site pagers 31.725mhz 31.75MHz 31.775MHz POCSAG

31.725 MHz FM 31,725 MHz 31.7250
31.750 MHz FM 31,750 MHz 31.7500
31.775 MHz FM 31,775 MHz 31.7750

Italian hospital pagers and data links:

Lots in the 26-28 MHz band, but also 40 MHz band and the 43 MHz VHF CB band (voice and data)

40.0125
40.0375
40.0625
40.0875

43.3000 to 43.5875 MHz (12.5 kHz spacing), FM mode. Lots of data on these channels.