diff --git a/variants/esp32/diy/hydra/platformio.ini b/variants/esp32/diy/hydra/platformio.ini
index 3afd17e01..5dcdd9461 100644
--- a/variants/esp32/diy/hydra/platformio.ini
+++ b/variants/esp32/diy/hydra/platformio.ini
@@ -12,5 +12,6 @@ extends = esp32_base
 board = esp32doit-devkit-v1
 build_flags =
   ${esp32_base.build_flags}
+  -D EBYTE_E22
   -D DIY_V1
   -I variants/esp32/diy/hydra
diff --git a/variants/esp32/diy/hydra/variant.h b/variants/esp32/diy/hydra/variant.h
index 68194f869..6bd296097 100644
--- a/variants/esp32/diy/hydra/variant.h
+++ b/variants/esp32/diy/hydra/variant.h
@@ -43,4 +43,12 @@
 #define LORA_TXEN SX126X_TXEN   // Compatibility with variant file configuration structure
 #define LORA_RXEN SX126X_RXEN   // Compatibility with variant file configuration structure
 #define LORA_RESET SX126X_RESET // Compatibility with variant file configuration structure
-#define LORA_DIO2 SX126X_BUSY   // Compatibility with variant file configuration structure
\ No newline at end of file
+#define LORA_DIO2 SX126X_BUSY   // Compatibility with variant file configuration structure
+
+
+#ifdef EBYTE_E22
+// Internally the TTGO module hooks the SX126x-DIO2 in to control the TX/RX switch
+// (which is the default for the sx1262interface code)
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define TCXO_OPTIONAL // make it so that the firmware can try both TCXO and XTAL
+#endif
\ No newline at end of file