On the W12 (schematic W12-MB-V0.2, July 2026) the sub-GHz GC1109 was
never turned on, so every packet left through a shut-down, unpowered
front end about 50 dB below the board's working output.
- Its LDO is enabled by IO4 (PA_EN_M), whose pull-up is not fitted:
drive it as LR2021_POWER_EN.
- Its CTX/CPS/CSD pins are LR2021 DIO9/10/11, not hardwired: add an
RF-switch table (LR2021_DIO_AS_RF_SWITCH, rfswitch.h).
- Hold IO3 (PA_EN_G, 2.4 GHz front end) low instead of floating.
- Add the GC1109 TX gain curve (same front end as the Heltec V4.2), so
the working PA stays within the configured and regional power.
- Correct the comments that called the enables pulled high, swapped
IO3/IO4, and said RF switching was hardwired.
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
