diff --git a/executables/nr-ru.c b/executables/nr-ru.c
index 2337dcce7f86889955515b79369383e8b5797340..d22c558eeae40ca0c3bb248b5aa18b7426c21c29 100644
--- a/executables/nr-ru.c
+++ b/executables/nr-ru.c
@@ -1079,13 +1079,10 @@ void fill_rf_config(RU_t *ru, char *rf_config_file) {
   } else if (mu == NR_MU_1) {
     if(N_RB == 273) {
       if (fp->threequarter_fs) {
-        cfg->sample_rate=115.2e6;
-        cfg->samples_per_frame = 1152000;
-        cfg->tx_bw = 100e6;
-        cfg->rx_bw = 100e6;
+        AssertFatal(0 == 1,"three quarter sampling not supported for N_RB 273\n");
       } else {
-        cfg->sample_rate=153.6e6;
-        cfg->samples_per_frame = 1536000;
+        cfg->sample_rate=122.88e6;
+        cfg->samples_per_frame = 1228800;
         cfg->tx_bw = 100e6;
         cfg->rx_bw = 100e6;
       }
diff --git a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
index 76ebd556ca6046c52caca9f9f982eac08844cef8..6e6197c898bb024af5bda149acc58b613c9084b1 100644
--- a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
+++ b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
@@ -1191,22 +1191,6 @@ extern "C" {
         LOG_I(HW,"%s() sample_rate:%u\n", __FUNCTION__, (int)openair0_cfg[0].sample_rate);
 
         switch ((int)openair0_cfg[0].sample_rate) {
-          case 153600000:
-            // from usrp_time_offset
-            //openair0_cfg[0].samples_per_packet    = 2048;
-            openair0_cfg[0].tx_sample_advance     = 15; //to be checked
-            openair0_cfg[0].tx_bw                 = 100e6;
-            openair0_cfg[0].rx_bw                 = 100e6;
-            break;
-
-          case 115200000:
-            // from usrp_time_offset
-            //openair0_cfg[0].samples_per_packet    = 2048;
-            openair0_cfg[0].tx_sample_advance     = 15; //to be checked
-            openair0_cfg[0].tx_bw                 = 100e6;
-            openair0_cfg[0].rx_bw                 = 100e6;
-            break;
-
           case 122880000:
             // from usrp_time_offset
             //openair0_cfg[0].samples_per_packet    = 2048;