change default EARFCN to 3350 or 2.68GHz

as 3400 or 2.685 GHz is on the edge of band 7, some phones won't connect
to a 20 MHz cell on this EARFCN.

In order to simplify testing with other bandwidths we change the default EARFCN.

srsenb/enb.conf.example

@@ -59,7 +59,7 @@ drb_config = drb.conf
 #                     Default "auto". B210 USRP: 100 samples, bladeRF: 27.
 #####################################################################
 [rf]
-#dl_earfcn = 3400
+#dl_earfcn = 3350
 tx_gain = 80
 rx_gain = 40
 

srsenb/rr.conf.example

@@ -58,7 +58,7 @@ cell_list =
     tac = 0x0007;
     pci = 1;
     // root_seq_idx = 204;
-    dl_earfcn = 3400;
+    dl_earfcn = 3350;
     //ul_earfcn = 21400;
     ho_active = false;
 

srsue/ue.conf.example

@@ -28,7 +28,7 @@
 #                     Default is auto (yes for UHD, no for rest)
 #####################################################################
 [rf]
-dl_earfcn = 3400
+dl_earfcn = 3350
 freq_offset = 0
 tx_gain = 80
 #rx_gain = 40