I think the LILYGO T-Beam I have uses this chip but I've not checked. It's not specified in the ailexpress listing.
https://www.semtech.com/products/wireless-rf/lora-connect/sx1276 SX1276/77/78/79
Specs from Semtec:
“Using Semtech’s patented LoRa modulation technique SX1276/77/78/79 can achieve a sensitivity of over -148dBm using a low cost crystal and bill of materials. The high sensitivity combined with the integrated +20dBm power amplifier”
168dB maximum link budget +20dBm - 100mW constant RF output vs. V supply +14dBm high efficiency PA Programmable bit rate up to 300kbps High sensitivity: down to -148dBm Bullet-proof front end: IIP3 = -11dBm Excellent blocking immunity Low RX current of 9.9mA, 200nA register retention Fully integrated synthesizer with a resolution of 61Hz FSK, GFSK, MSK, GMSK, LoRa and OOK modulation Built-in bit synchronizer for clock recovery Preamble detection 127dB Dynamic Range RSSI Automatic RF Sense and CAD with ultra-fast AFC Packet engine up to 256 bytes with CRC Built-in temperature sensor and low battery indicator
“Better” than SX1276, according to comments on the internet / meshtastic people.
Used in most boards I have: Heltec, Waveshare Pi Pico module, but maybe not the LILYGO T-Beam, which is probably the SX1276.
Semtec specs:
LoRa and FSK Modem 170dB maximum link budget (SX1262 / 68) +22dBm or +15dBm high efficiency PA Low RX current of 4.6mA Integrated DC-DC converter and LDO Programmable bit rate up to 62.5kbps LoRa and 300kbps FSK High sensitivity: down to -148dBm 88dB blocking immunity at 1MHz offset Co-channel rejection of 19dB in LoRa mode FSK, GFSK, MSK, GMSK, LoRa and Long Range FHSS modulations Built-in bit synchronizer for clock recovery Automatic Channel Activity Detection (CAD) with ultra-fast AFC