diff --git a/freedata_server/codec2.py b/freedata_server/codec2.py
index 1e74ba08..846e7251 100644
--- a/freedata_server/codec2.py
+++ b/freedata_server/codec2.py
@@ -576,13 +576,13 @@ def create_default_fsk_config():
         )
 
 data_vhf_1_config = create_default_fsk_config()
-data_vhf_1_config.interleave_frames = 0
+data_vhf_1_config.interleave_frames = 1
 data_vhf_1_config.M = 4
-data_vhf_1_config.Rs = 1000
+data_vhf_1_config.Rs = 200
 data_vhf_1_config.Fs = 8000
-data_vhf_1_config.first_tone = 1150
-data_vhf_1_config.tone_spacing = 200
-data_vhf_1_config.codename = "H_1024_2048_4f".encode("utf-8")
+data_vhf_1_config.first_tone = 1500
+data_vhf_1_config.tone_spacing = 400
+data_vhf_1_config.codename = "H_256_512_4".encode("utf-8")
 
 # ---------------- OFDM 500 Hz Bandwidth ---------------#
 
diff --git a/freedata_server/demodulator.py b/freedata_server/demodulator.py
index 2c57bee6..3e7f4cd0 100644
--- a/freedata_server/demodulator.py
+++ b/freedata_server/demodulator.py
@@ -6,7 +6,7 @@ import threading
 import audio
 import itertools
 
-from freedata_server.codec2 import FREEDV_MODE
+from codec2 import (FREEDV_MODE)
 
 TESTMODE = False
 
@@ -58,6 +58,7 @@ class Demodulator():
         # enable decoding of signalling modes
         self.MODE_DICT[codec2.FREEDV_MODE.signalling.value]["decode"] = True
         self.MODE_DICT[codec2.FREEDV_MODE.signalling_ack.value]["decode"] = True
+        self.MODE_DICT[codec2.FREEDV_MODE.data_vhf_1.value]["decode"] = True
 
 
     def init_codec2(self):
diff --git a/freedata_server/modulator.py b/freedata_server/modulator.py
index 9d7fdef6..45166338 100644
--- a/freedata_server/modulator.py
+++ b/freedata_server/modulator.py
@@ -2,7 +2,7 @@ import ctypes
 import codec2
 import structlog
 from codec2 import FREEDV_MODE
-from freedata_server.codec2 import FREEDV_ADVANCED_FSK
+from codec2 import FREEDV_ADVANCED_FSK
 
 
 class Modulator:
@@ -239,11 +239,11 @@ class Modulator:
 
             # Create modulation for all frames in the list
             for frame in frames:
-                if self.MODE not in [FREEDV_MODE.data_vhf_1]:
-                    txbuffer = self.transmit_add_preamble(txbuffer, freedv)
+                #if self.MODE not in [FREEDV_MODE.data_vhf_1]:
+                txbuffer = self.transmit_add_preamble(txbuffer, freedv)
                 txbuffer = self.transmit_create_frame(txbuffer, freedv, frame)
-                if self.MODE not in [FREEDV_MODE.data_vhf_1]:
-                    txbuffer = self.transmit_add_postamble(txbuffer, freedv)
+                #if self.MODE not in [FREEDV_MODE.data_vhf_1]:
+                txbuffer = self.transmit_add_postamble(txbuffer, freedv)
 
             # Add delay to end of frames
             txbuffer = self.transmit_add_silence(txbuffer, repeat_delay)