SX1262 Frequency Ranges

The SX1262 chip is a wide-band radio; the E22 modules are tuned, filtered and amplified for a specific slice of it. The module’s range, not the chip’s, is what the firmware can actually use.

The chip versus the module

Component	Frequency range
SX1262 bare chip	150 MHz - 960 MHz
E22-400M30S module	410 - 493 MHz
E22-900M30S module	850.125 - 929.125 MHz

The 433 MHz beacon uses the 400 MHz variant. A 900 MHz module cannot be configured to 433 MHz, whatever the chip could do in theory: the module’s front-end filters and the PA matching are built for its band.

What the firmware enforces

The configuration validates the frequency against the module’s range before accepting it:

• Below the range: rejected with a configuration error (see Firmware Error Codes)
• Above the range: rejected the same way
• Inside the range but outside the ISM band: accepted with the legal warning, for licensed use

The calibration trap

The SX1262 self-calibrates at boot against the module’s crystal. If the crystal frequency differs from the firmware’s assumed value, the radio shifts off-frequency: the SX1262 Registers page covers the frequency-step math and the symptom.

The PMR446 question

PMR446 (446 MHz) sits inside the 400 MHz module’s range. The beacon can receive it in SEARCH mode but does not transmit there: PMR446 is a separate allocation with its own rules (see PMR446 Deep Dive).

Related pages

• E22 Radio Module Guide for the module
• Frequency Compatibility for the band
• SX1262 Registers for the configuration