diff --git a/src/main.cpp b/src/main.cpp
index 95da04014..c3f892bce 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -233,6 +233,8 @@ void setup()
     delay(1);
 #endif
 
+    // We need to scan here to decide if we have a screen for nodeDB.init()
+    scanI2Cdevice();
 #ifdef RAK4630
     // scanEInkDevice();
 #endif
@@ -273,10 +275,12 @@ void setup()
     power->setup(); // Must be after status handler is installed, so that handler gets notified of the initial configuration
 
     /*
-    * Move the scanning I2C device to the back of power initialization. 
-    * Some boards need to be powered on to correctly scan to the device address, such as t-beam-s3-core
+    * Repeat the scanning for I2C devices after power initialization. 
+    * Boards with an PMU need to be powered on to correctly scan to the device address, such as t-beam-s3-core
     */
-    scanI2Cdevice();
+    if ((HW_VENDOR == HardwareModel_LILYGO_TBEAM_S3_CORE) || (HW_VENDOR == HardwareModel_TBEAM)) {
+        scanI2Cdevice();
+    }
     
     // Init our SPI controller (must be before screen and lora)
     initSPI();
diff --git a/src/platform/portduino/SimRadio.cpp b/src/platform/portduino/SimRadio.cpp
index ccfaa3b03..b3af114e5 100644
--- a/src/platform/portduino/SimRadio.cpp
+++ b/src/platform/portduino/SimRadio.cpp
@@ -171,6 +171,8 @@ void SimRadio::onNotify(uint32_t notification)
                     // Packet has been sent, count it toward our TX airtime utilization.
                     uint32_t xmitMsec = getPacketTime(txp);
                     airTime->logAirtime(TX_LOG, xmitMsec);
+
+                    delay(xmitMsec); // Model the time it is busy sending
                     completeSending();
                 }
             }
@@ -207,6 +209,9 @@ void SimRadio::startSend(MeshPacket * txp)
 
 void SimRadio::startReceive(MeshPacket *p) {
     isReceiving = true;
+    size_t length = getPacketLength(p);
+    uint32_t xmitMsec = getPacketTime(length);
+    delay(xmitMsec); // Model the time it is busy receiving
     handleReceiveInterrupt(p);
 }