diff --git a/lora_pkt_fwd/src/lora_pkt_fwd.c b/lora_pkt_fwd/src/lora_pkt_fwd.c
index 801f28d..2772a8e 100644
--- a/lora_pkt_fwd/src/lora_pkt_fwd.c
+++ b/lora_pkt_fwd/src/lora_pkt_fwd.c
@@ -233,6 +233,8 @@ static struct lgw_tx_gain_lut_s txlut; /* TX gain table */
 static uint32_t tx_freq_min[LGW_RF_CHAIN_NB]; /* lowest frequency supported by TX chain */
 static uint32_t tx_freq_max[LGW_RF_CHAIN_NB]; /* highest frequency supported by TX chain */
 
+static uint32_t rx_rf_freq[LGW_RF_CHAIN_NB]; /* center frequency of the radio in Hz */
+
 /* -------------------------------------------------------------------------- */
 /* --- PRIVATE FUNCTIONS DECLARATION ---------------------------------------- */
 
@@ -494,7 +496,7 @@ static int parse_SX1301_configuration(const char * conf_file) {
             MSG("INFO: radio %i disabled\n", i);
         } else  { /* radio enabled, will parse the other parameters */
             snprintf(param_name, sizeof param_name, "radio_%i.freq", i);
-            rfconf.freq_hz = (uint32_t)json_object_dotget_number(conf_obj, param_name);
+            rfconf.freq_hz = rx_rf_freq[i] = (uint32_t)json_object_dotget_number(conf_obj, param_name);
             snprintf(param_name, sizeof param_name, "radio_%i.rssi_offset", i);
             rfconf.rssi_offset = (float)json_object_dotget_number(conf_obj, param_name);
             snprintf(param_name, sizeof param_name, "radio_%i.type", i);
@@ -1995,8 +1997,15 @@ void thread_down(void) {
             break;
         case 12:
             beacon_pkt.datarate = DR_LORA_SF12;
-            beacon_RFU1_size = 5;
-            beacon_RFU2_size = 3;
+
+            /* Check radio 0 center frequency to determine if US or AU region */
+            if (rx_rf_freq[0] > 914900000U ) {
+                beacon_RFU1_size = 3;
+                beacon_RFU2_size = 1;
+            } else {
+                beacon_RFU1_size = 5;
+                beacon_RFU2_size = 3;
+            }
             break;
         default:
             /* should not happen */