diff --git a/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.cpp b/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.cpp
index 414f97a..654d545 100644
--- a/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.cpp
+++ b/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.cpp
@@ -137,6 +137,14 @@ void FPGA::Disable(Periphery p) {
 	WriteRegister(Reg::SystemControl, SysCtrlReg);
 }
 
+bool FPGA::IsEnabled(Periphery p) {
+	if(SysCtrlReg & (uint16_t) p) {
+		return true;
+	} else {
+		return false;
+	}
+}
+
 void FPGA::SetWindow(Window w) {
 	SysCtrlReg &= ~0x0060;
 	SysCtrlReg |= (int) w << 5;
diff --git a/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.hpp b/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.hpp
index 5ddfdf3..ce6aa34 100644
--- a/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.hpp
+++ b/Software/VNA_embedded/Application/Drivers/FPGA/FPGA.hpp
@@ -103,6 +103,7 @@ void SetNumberOfPoints(uint16_t npoints);
 void SetSamplesPerPoint(uint32_t nsamples);
 void Enable(Periphery p, bool enable = true);
 void Disable(Periphery p);
+bool IsEnabled(Periphery p);
 void SetWindow(Window w);
 void EnableInterrupt(Interrupt i);
 void DisableInterrupt(Interrupt i);
diff --git a/Software/VNA_embedded/Application/VNA.cpp b/Software/VNA_embedded/Application/VNA.cpp
index 5086a6c..ee1e7ce 100644
--- a/Software/VNA_embedded/Application/VNA.cpp
+++ b/Software/VNA_embedded/Application/VNA.cpp
@@ -259,7 +259,7 @@ void VNA::SweepHalted() {
 			Si5351.Enable(SiChannel::LowbandSource);
 			FPGA::Disable(FPGA::Periphery::SourceRF);
 		}
-	} else {
+	} else if(!FPGA::IsEnabled(FPGA::Periphery::SourceRF)){
 		// first sweep point in highband is also halted, disable lowband source
 		Si5351.Disable(SiChannel::LowbandSource);
 		FPGA::Enable(FPGA::Periphery::SourceRF);