diff --git a/Software/VNA_embedded/Application/Generator.cpp b/Software/VNA_embedded/Application/Generator.cpp
index a5c3867..8904200 100644
--- a/Software/VNA_embedded/Application/Generator.cpp
+++ b/Software/VNA_embedded/Application/Generator.cpp
@@ -34,7 +34,7 @@ void Generator::Setup(Protocol::GeneratorSettings g) {
 	if(g.frequency < HW::BandSwitchFrequency) {
 		bandSelect = true;
 		FPGA::Disable(FPGA::Periphery::SourceChip);
-		Si5351.SetCLK(SiChannel::LowbandSource, g.frequency, Si5351C::PLL::B,
+		Si5351.SetCLK(SiChannel::LowbandSource, g.frequency, Si5351C::PLL::A,
 				amplitude.lowBandPower);
 		Si5351.Enable(SiChannel::LowbandSource);
 	} else {
diff --git a/Software/VNA_embedded/Application/Manual.cpp b/Software/VNA_embedded/Application/Manual.cpp
index a225e57..52a2d17 100644
--- a/Software/VNA_embedded/Application/Manual.cpp
+++ b/Software/VNA_embedded/Application/Manual.cpp
@@ -16,7 +16,7 @@ void Manual::Setup(Protocol::ManualControl m) {
 	FPGA::AbortSweep();
 	// Configure lowband source
 	if (m.V1.SourceLowEN) {
-		Si5351.SetCLK(SiChannel::LowbandSource, m.V1.SourceLowFrequency, Si5351C::PLL::B,
+		Si5351.SetCLK(SiChannel::LowbandSource, m.V1.SourceLowFrequency, Si5351C::PLL::A,
 				(Si5351C::DriveStrength) m.V1.SourceLowPower);
 		Si5351.Enable(SiChannel::LowbandSource);
 	} else {
diff --git a/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp b/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp
index dc9d083..ddca0b1 100644
--- a/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp
+++ b/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp
@@ -94,7 +94,7 @@ static void StartNextSample() {
 					}
 					attenuator = amplitude.attenuator;
 					if(trackingFreq < HW::BandSwitchFrequency) {
-						Si5351.SetCLK(SiChannel::LowbandSource, trackingFreq, Si5351C::PLL::B, amplitude.lowBandPower);
+						Si5351.SetCLK(SiChannel::LowbandSource, trackingFreq, Si5351C::PLL::A, amplitude.lowBandPower);
 						FPGA::Disable(FPGA::Periphery::SourceChip);
 						FPGA::Disable(FPGA::Periphery::SourceRF);
 						trackingLowband = true;
diff --git a/Software/VNA_embedded/Application/VNA.cpp b/Software/VNA_embedded/Application/VNA.cpp
index 01a05cc..2b204d9 100644
--- a/Software/VNA_embedded/Application/VNA.cpp
+++ b/Software/VNA_embedded/Application/VNA.cpp
@@ -458,7 +458,7 @@ void VNA::SweepHalted() {
 			}
 
 			// need the Si5351 as Source
-			bool freqSuccess = Si5351.SetCLK(SiChannel::LowbandSource, frequency, Si5351C::PLL::B, driveStrength);
+			bool freqSuccess = Si5351.SetCLK(SiChannel::LowbandSource, frequency, Si5351C::PLL::A, driveStrength);
 			static bool lowbandDisabled = false;
 			if (pointCnt == 0) {
 				// First point in sweep, switch to correct source