How do I know what frequency my L band is?

Satellite frequency to L-band conversion

L for “long” wave . S. 2 to 4 GHz. S for “short” wave. Don’t confuse this with the short wave radio band, which is much lower in frequency.

L band refers to the operating frequency range of 1–2 GHz in the radio spectrum. The wavelength range of L band is 30–15 cm. The L band is one of the chief operating ranges used by various applications such as radars, global positioning systems (GPS), radio, telecommunications and aircraft surveillance.