diff --git a/src/main.cpp b/src/main.cpp
index f4fb24fa91..48dec89e7e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -112,6 +112,10 @@ AccelerometerThread *accelerometerThread = nullptr;
 AudioThread *audioThread = nullptr;
 #endif
 
+#if defined(TCXO_OPTIONAL)
+float tcxoVoltage = SX126X_DIO3_TCXO_VOLTAGE; // if TCXO is optional, put this here so it can be changed further down.
+#endif
+
 using namespace concurrency;
 
 // We always create a screen object, but we only init it if we find the hardware
@@ -890,7 +894,7 @@ void setup()
     }
 #endif
 
-#if defined(USE_SX1262) && !defined(ARCH_PORTDUINO)
+#if defined(USE_SX1262) && !defined(ARCH_PORTDUINO) && !defined(TCXO_OPTIONAL)
     if (!rIf) {
         rIf = new SX1262Interface(RadioLibHAL, SX126X_CS, SX126X_DIO1, SX126X_RESET, SX126X_BUSY);
         if (!rIf->init()) {
@@ -904,6 +908,40 @@ void setup()
     }
 #endif
 
+#if defined(USE_SX1262) && !defined(ARCH_PORTDUINO) && defined(TCXO_OPTIONAL)
+    if (!rIf) {
+        // Try using the specified TCXO voltage
+            rIf = new SX1262Interface(RadioLibHAL, SX126X_CS, SX126X_DIO1, SX126X_RESET, SX126X_BUSY);
+            if (!rIf->init()) {
+                LOG_WARN("Failed to find SX1262 radio with TCXO using DIO3 reference voltage at %f V\n", tcxoVoltage);
+                delete rIf;
+                rIf = NULL;
+                tcxoVoltage = 0; // if it fails, set the TCXO voltage to zero for the next attempt
+            } else {
+                LOG_INFO("SX1262 Radio init succeeded, using ");
+                LOG_WARN("SX1262 Radio with TCXO");
+                LOG_INFO(", reference voltage at %f V\n", tcxoVoltage);
+                radioType = SX1262_RADIO;
+            }
+    }
+
+    if (!rIf) {
+        // If specified TCXO voltage fails, attempt to use DIO3 as a reference instea
+            rIf = new SX1262Interface(RadioLibHAL, SX126X_CS, SX126X_DIO1, SX126X_RESET, SX126X_BUSY);
+            if (!rIf->init()) {
+                LOG_WARN("Failed to find SX1262 radio with XTAL using DIO3 reference voltage at %f V\n", tcxoVoltage);
+                delete rIf;
+                rIf = NULL;
+                tcxoVoltage = SX126X_DIO3_TCXO_VOLTAGE; // if it fails, set the TCXO voltage back for the next radio search
+            } else {
+                LOG_INFO("SX1262 Radio init succeeded, using ");
+                LOG_WARN("SX1262 Radio with XTAL");
+                LOG_INFO(", reference voltage at %f V\n", tcxoVoltage);
+                radioType = SX1262_RADIO;
+            }
+    }
+#endif
+
 #if defined(USE_SX1268)
     if (!rIf) {
         rIf = new SX1268Interface(RadioLibHAL, SX126X_CS, SX126X_DIO1, SX126X_RESET, SX126X_BUSY);
diff --git a/src/mesh/SX126xInterface.cpp b/src/mesh/SX126xInterface.cpp
index b564ba287e..39ffb0ac95 100644
--- a/src/mesh/SX126xInterface.cpp
+++ b/src/mesh/SX126xInterface.cpp
@@ -40,7 +40,7 @@ template <typename T> bool SX126xInterface<T>::init()
         0; // "TCXO reference voltage to be set on DIO3. Defaults to 1.6 V, set to 0 to skip." per
            // https://github.com/jgromes/RadioLib/blob/690a050ebb46e6097c5d00c371e961c1caa3b52e/src/modules/SX126x/SX126x.h#L471C26-L471C104
     // (DIO3 is free to be used as an IRQ)
-#else
+#elif !defined(TCXO_OPTIONAL)
     float tcxoVoltage = SX126X_DIO3_TCXO_VOLTAGE;
     // (DIO3 is not free to be used as an IRQ)
 #endif
@@ -345,4 +345,4 @@ template <typename T> bool SX126xInterface<T>::sleep()
 #endif
 
     return true;
-}
\ No newline at end of file
+}
diff --git a/variants/diy/nrf52_promicro_diy_tcxo/variant.h b/variants/diy/nrf52_promicro_diy_tcxo/variant.h
index b09d3bdb49..2e506d0552 100644
--- a/variants/diy/nrf52_promicro_diy_tcxo/variant.h
+++ b/variants/diy/nrf52_promicro_diy_tcxo/variant.h
@@ -128,22 +128,29 @@ NRF52 PRO MICRO PIN ASSIGNMENT
 #define SX126X_RXEN (0 + 17)     // P0.17
 #define SX126X_TXEN RADIOLIB_NC  // Assuming that DIO2 is connected to TXEN pin. If not, TXEN must be connected.
 
-/*
-On the SX1262, DIO3 sets the voltage for an external TCXO, if one is present. If one is not present, then this should not be used.
-
-Ebyte
-e22-900mm22s has no TCXO
-e22-900m22s has TCXO
-e220-900mm22s has no TCXO, works with/without this definition, looks like DIO3 not connected at all
-
-AI-thinker
-RA-01SH does not have TCXO
+// #define SX126X_MAX_POWER 8 set this if using a high-power board!
 
-Waveshare
-Core1262 has TCXO
+/*
+On the SX1262, DIO3 sets the voltage for an external TCXO, if one is present. If one is not present, use TCXO_OPTIONAL to try both settings.
+
+| Mfr        | Module           | TCXO | RF Switch | Notes                                        |
+| ---------- | ---------------- | ---- | --------- | -------------------------------------------- |
+| Ebyte      | E22-900M22S      | Yes  | Ext       |                                              |
+| Ebyte      | E22-900MM22S     | No   | Ext       |                                              |
+| Ebyte      | E22-900M30S      | Yes  | Ext       |                                              |
+| Ebyte      | E22-900M33S      | Yes  | Ext       | MAX_POWER must be set to 8 for this          |
+| Ebyte      | E220-900M22S     | No   | Ext       | LLCC68, looks like DIO3 not connected at all |
+| AI-Thinker | RA-01SH          | No   | Int       |                                              |
+| Heltec     | HT-RA62          | Yes  | Int       |                                              |
+| NiceRF     | Lora1262         | yes  | Int       |                                              |
+| Waveshare  | Core1262-HF      | yes  | Ext       |                                              |
+| Waveshare  | LoRa Node Module | yes  | Int       |                                              |
 
 */
+
 #define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define TCXO_OPTIONAL // make it so that the firmware can try both TCXO and XTAL
+extern float tcxoVoltage; // make this available everywhere
 
 #ifdef __cplusplus
 }
@@ -153,4 +160,4 @@ Core1262 has TCXO
  *        Arduino objects - C++ only
  *----------------------------------------------------------------------------*/
 
-#endif
\ No newline at end of file
+#endif