diff --git a/ADF7021.cpp b/ADF7021.cpp
index ac5d5fe..027050d 100644
--- a/ADF7021.cpp
+++ b/ADF7021.cpp
@@ -305,7 +305,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
     case STATE_YSF:
       // Dev: +1 symb 900 Hz, symb rate = 4800
 
-      ADF7021_REG3 = ADF7021_REG3_YSF;
+      ADF7021_REG3 = (m_LoDevYSF ? ADF7021_REG3_YSF_L : ADF7021_REG3_YSF_H);
       ADF7021_REG10 = ADF7021_REG10_YSF;
 
       // K=28
diff --git a/ADF7021.h b/ADF7021.h
index 8e2e751..db421ed 100644
--- a/ADF7021.h
+++ b/ADF7021.h
@@ -47,8 +47,8 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 
 // R = 4
 // DEMOD_CLK = 2.4576 MHz (DSTAR)
-// DEMOD_CLK = 4.9152 MHz (DMR, P25)
-// DEMOD_CLK = 7.3728 MHz (YSF)
+// DEMOD_CLK = 4.9152 MHz (DMR, YSF_L, P25)
+// DEMOD_CLK = 7.3728 MHz (YSF_H)
 #define ADF7021_PFD              3686400.0
 
 // PLL (REG 01)
@@ -68,12 +68,13 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 #define ADF7021_REG3_DSTAR       0x2A4C4193
 #if defined(TEST_DAC)
 #define ADF7021_REG3_DMR         0x2A4C04D3
-#define ADF7021_REG3_YSF         0x2A4C04D3
+#define ADF7021_REG3_YSF_L       0x2A4C04D3
+#define ADF7021_REG3_YSF_H       0x2A4C0493
 #define ADF7021_REG3_P25         0x2A4C04D3
 #else
 #define ADF7021_REG3_DMR         0x2A4C80D3
-//#define ADF7021_REG3_YSF         0x2A4C80D3
-#define ADF7021_REG3_YSF         0x2A4CC093
+#define ADF7021_REG3_YSF_L       0x2A4C80D3
+#define ADF7021_REG3_YSF_H       0x2A4CC093
 #define ADF7021_REG3_P25         0x2A4C80D3
 #endif
 
@@ -81,15 +82,14 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 // Bug in ADI evaluation software, use datasheet formula (4FSK)
 #define ADF7021_DISC_BW_DSTAR    522U // K=85
 #define ADF7021_DISC_BW_DMR      393U // K=32
-#define ADF7021_DISC_BW_YSF_L    394U // K=32
-//#define ADF7021_DISC_BW_YSF_H    344U // K=28
+#define ADF7021_DISC_BW_YSF_L    393U // K=32
 #define ADF7021_DISC_BW_YSF_H    516U // K=28
 #define ADF7021_DISC_BW_P25      394U // K=32
 
 // Post demodulator bandwith (REG 04)
 #define ADF7021_POST_BW_DSTAR    10U
 #define ADF7021_POST_BW_DMR      150U
-#define ADF7021_POST_BW_YSF      15U
+#define ADF7021_POST_BW_YSF      20U
 #define ADF7021_POST_BW_P25      6U
 
 // IF filter (REG 05)
@@ -128,8 +128,8 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 
 // R = 2
 // DEMOD_CLK = 2.4576 MHz (DSTAR)
-// DEMOD_CLK = 4.0960 MHz (DMR, P25)
-// DEMOD_CLK = 6.1440 MHz (YSF)
+// DEMOD_CLK = 4.0960 MHz (DMR, YSF_L, P25)
+// DEMOD_CLK = 6.1440 MHz (YSF_H)
 #define ADF7021_PFD              6144000.0
 
 // PLL (REG 01)
@@ -149,11 +149,13 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 #define ADF7021_REG3_DSTAR       0x29EC4153
 #if defined(TEST_DAC)
 #define ADF7021_REG3_DMR         0x29EC0493
-#define ADF7021_REG3_YSF         0x29EC0493
+#define ADF7021_REG3_YSF_L       0x29EC0493
+#define ADF7021_REG3_YSF_H       0x29EC0493
 #define ADF7021_REG3_P25         0x29EC0493
 #else
 #define ADF7021_REG3_DMR         0x29ECA093
-#define ADF7021_REG3_YSF         0x29ECA093
+#define ADF7021_REG3_YSF_L       0x29ECA093
+#define ADF7021_REG3_YSF_H       0x29ECA093
 #define ADF7021_REG3_P25         0x29ECA093
 #endif
 
@@ -167,7 +169,7 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 
 // Post demodulator bandwith (REG 04)
 #define ADF7021_POST_BW_DSTAR    10U
-#define ADF7021_POST_BW_DMR      100U
+#define ADF7021_POST_BW_DMR      150U
 #define ADF7021_POST_BW_YSF      20U
 #define ADF7021_POST_BW_P25      6U