diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index ed5247d07..ae1a48889 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -397,8 +397,8 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
 	int i = 0;
 	uint8_t *buf = BigBuf_get_addr();
 
-	//FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
+	//FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
 
 	AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT | GPIO_SSC_CLK;
 	AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;