Guide Frequency database

Guide: the Frequency database

What it is. A built-in, searchable list of well-known frequencies for every mode: calling channels, beacons, band plans and published satellite downlinks. It answers "where do I look for this?" and tunes the receiver for you.

It contains no station databases: no radio or TV station lists, no repeater lists, no data about single aircraft or ships. Everything was compiled from public regulations and standards, and each entry names its source.

Opening it

• View > Frequencies... or Ctrl+Shift+F.
• In the Tuner panel, the Known frequencies (n) drop-down lists the entries of the current mode ("Well-known frequencies of this mode: pick one to tune to it"), with Open the Frequencies panel... at the end.

Using it

1. Type in the search box: it matches name, notes, mode and a frequency (162.4 finds 162.4000 and 162.4125).
2. Use the filters: Region, Category, Mode, Stars only (your favourites) and Mine (only entries you added or imported).
3. Double-click a row, or press Tune. OnAir switches to the entry's mode, applies the mode's tuning and tunes to the frequency. A running receiver restarts when the mode changes.
4. Frequency only tunes and keeps the current mode.
5. Add to Memory puts the entry into the Memory panel. If it is already there OnAir says "Already in Memory".
6. Favourite stars an entry; Source... shows where the value comes from.

The columns are Frequency, Mode, Name, Bandwidth, Region and Category. Entries with an approximate or operator-dependent value say so in the notes. A few (Inmarsat-C and Aero channels, paging allocations, ALE channels) are "commonly used" values: check them against a current list before relying on them.

What is in it

Group	Examples
Aviation	ADS-B, UAT, FLARM, ACARS, VDL2, HFDL, airband guard and SAR channels, VOLMET, VOR, ILS, NDB, drone Remote ID
Marine	AIS, VDES, DSC, NAVTEX, weather fax, marine VHF channels
HF	FT8, FT4, WSPR, JS8Call, PSK31, RTTY, CW, SSTV, NCDXF beacons, ALE, time signals
Amateur	APRS by region, LoRa APRS, D-STAR, M17, calling frequencies, ISS and amateur satellites, QO-100
Satellite	NOAA APT, Meteor LRPT, HRPT, GOES, Elektro-L, GNSS signals, Iridium, Globalstar, Orbcomm, Inmarsat
Data	ISM sensors, LoRaWAN by region, Meshtastic, paging by country, Wi-Fi, BLE, Zigbee, DECT, GSM-R, TETRA, radiosondes
PMR	PMR446, FRS / GMRS, MURS, CB, LPD433
Broadcast	DAB blocks, DVB-T / T2 channel plans, ATSC, ISDB-T, DTMB, FM band edges (not stations)

The footer shows how many entries are built in and how many are yours.

Your own entries

• Add entry... opens a small form: Frequency (MHz), mode (or "(frequency only)"), Bandwidth (kHz), Notes, then Save. An entry on a frequency and mode that exists already is refused.
• Import... reads a CSV or JSON file written by Export or by the Memory panel, or a plain frequency,name list in MHz.
• Export CSV... and Export JSON... write your own entries (not the built-in ones) in the Memory file format, so a list can move between the two panels.
• Your entries live in frequencies.json in the data folder; stars are kept in the settings.

QO-100

QO-100 entries give the RF downlink in the 10489.5 MHz band. The receiver works on the first IF behind an LNB with a 9750 MHz oscillator, so tuning an entry subtracts 9750 MHz. See Converters.

Tips

• If a frequency is outside what your radio can tune, OnAir says so in a note; it never blocks you.
• Frequencies are facts about regulations and standards, so they are not station lists: for your local broadcasters, use the Scan tab or a scanner.
• Wrong or missing entry? Tell us on GitHub with the source.

Related

Memory panel | Band plans | Fast sweep scanner | Modes