diff --git a/main/main.c b/main/main.c
index 9e92d7f..f8e45ee 100644
--- a/main/main.c
+++ b/main/main.c
@@ -81,7 +81,7 @@ uint8_t DB_UART_RTS_THRESH = 64;
 #endif
 
 int32_t DB_UART_BAUD_RATE = 57600;
-uint16_t DB_TRANS_BUF_SIZE = 64;
+uint16_t DB_TRANS_BUF_SIZE = 128;
 uint8_t DB_LTM_FRAME_NUM_BUFFER = 2;
 db_esp_signal_quality_t db_esp_signal_quality = {.air_rssi = -127, .air_noise_floor = -1, .gnd_rssi= -127, .gnd_noise_floor = -1};
 wifi_sta_list_t wifi_sta_list = {.num = 0};
@@ -623,7 +623,7 @@ void long_press_callback(void *arg,void *usr_data) {
     DB_UART_PIN_CTS = GPIO_NUM_0;
     DB_UART_PIN_RTS = GPIO_NUM_0;
     DB_SERIAL_PROTOCOL = DB_SERIAL_PROTOCOL_MAVLINK;
-    DB_TRANS_BUF_SIZE = 64;
+    DB_TRANS_BUF_SIZE = 128;
     DB_UART_RTS_THRESH = 64;
     DB_SERIAL_READ_TIMEOUT_MS = DB_SERIAL_READ_TIMEOUT_MS_DEFAULT;
     db_write_settings_to_nvs();