Heltec boards have LNA disabled by default.

variants/heltec_t096/LoRaFEMControl.h

@@ -16,6 +16,6 @@ class LoRaFEMControl
     void setLnaCanControl(bool can_control) { lna_can_control = can_control; }
 
   private:
-    bool lna_enabled = true;
+    bool lna_enabled = false;
     bool lna_can_control = false;
 };

variants/heltec_tracker_v2/LoRaFEMControl.h

@@ -16,6 +16,6 @@ class LoRaFEMControl
     void setLnaCanControl(bool can_control) { lna_can_control = can_control; }
 
   private:
-    bool lna_enabled = true;
+    bool lna_enabled = false;
     bool lna_can_control = false;
 };

variants/heltec_v4/LoRaFEMControl.h

@@ -23,7 +23,7 @@ class LoRaFEMControl
     LoRaFEMType getFEMType(void) const { return fem_type; }
   private:
     LoRaFEMType fem_type=OTHER_FEM_TYPES;
-    bool lna_enabled=true;
+    bool lna_enabled=false;
     bool lna_can_control=false;
 };