diff --git a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_0.hex b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_0.hex
new file mode 100644
index 0000000000000000000000000000000000000000..d40e229f8788ad11a894a457b216589bd1d6f964
--- /dev/null
+++ b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_0.hex
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diff --git a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_1.hex b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_1.hex
new file mode 100644
index 0000000000000000000000000000000000000000..25052b771ae8b3b98569f99db06ff7fe388980be
--- /dev/null
+++ b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_1.hex
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diff --git a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_2.hex b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_2.hex
new file mode 100644
index 0000000000000000000000000000000000000000..42a50332579457409ec388845b9396d67453b50f
--- /dev/null
+++ b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_2.hex
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diff --git a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_3.hex b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_3.hex
new file mode 100644
index 0000000000000000000000000000000000000000..c63bbbd47b47093eb7c89bc04acd67a21f30e27f
--- /dev/null
+++ b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex/bg_data_3.hex
@@ -0,0 +1,257 @@
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diff --git a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/python/gen_hex_files_block_gen.py b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/python/gen_hex_files_block_gen.py
new file mode 100644
index 0000000000000000000000000000000000000000..c0f7bc14d34322ad9422ab6d454468fea6ba90a6
--- /dev/null
+++ b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/python/gen_hex_files_block_gen.py
@@ -0,0 +1,145 @@
+###############################################################################
+#
+# Copyright (C) 2015
+# ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
+# P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+###############################################################################
+
+# Purpose:
+# . Generate HEX files for the 4 block generators, emulating BF output.
+# Description:
+# . The BG output block size is 256 words, without any gaps;
+# . The BGs emulate transposed BF output (b=beamlet, t=time);
+# . The 256-word blocks are 2 interleaved streams of 128 words:
+#   . stream 0) b0t0,b1t0, .. b0t127,b1t127 (repeated)
+#   . stream 1) b2t0,b3t0, .. b2t127,b3t127 (repeated)
+#   . stream 2) b4t0,b5t0, .. b4t127,b5t127 (repeated)
+#   . stream 3) b6t0,b7t0, .. b6t127,b7t127 (repeated)
+# . Each beamlet signal repeats after 128 samples and consists of an integer 
+#   number of sine wave periods.
+# . A full integration period spans 800000 timesamples:
+#   . 6250 * 128 timesamples
+#   . 3125 * 256-word BG output blocks.
+
+from common import *
+from mem_init_file import list_to_hex
+import matplotlib
+matplotlib.use('TkAgg')
+from common_dsp import *
+import matplotlib.pyplot as plt
+import numpy as np
+from scipy.fftpack import fft,ifft, fftfreq, fftshift
+
+NOF_INPUTS = 4 # 4 transposed BF output streams
+NOF_INPUT_SIGNALS = 8 # 4 streams * 2 interleaved signals
+COMPLEX_WIDTH = 8
+NOF_WORDS_PER_BLOCK = 128
+
+PATH = os.environ['RADIOHDL']+'/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/hex'
+FILENAME = "bg_data"
+
+###############################################################################
+# Create composite waves
+###############################################################################
+N = NOF_WORDS_PER_BLOCK
+t=range(N)
+
+# sample spacing
+T = 1.0 / N
+
+x = np.linspace(0.0, N*T, N)
+
+AMPL_MAX = 127
+CHANNELS = [1,5,12,17,21,25,28,34,41,47,54,55,60]
+NOF_CHANNELS = len(CHANNELS)
+
+input_signals = []
+for input_signal_nr in range(NOF_INPUT_SIGNALS):
+    phase_shift_deg = input_signal_nr
+    channel_signals = []
+    for bin_nr in CHANNELS:
+        phase_shift_rad = math.radians(phase_shift_deg)
+        ampl=AMPL_MAX/NOF_CHANNELS
+        signal = ampl * np.exp( (bin_nr) * 1.j * (2.0*np.pi*x+(phase_shift_rad/bin_nr)) )
+
+        channel_signals.append( signal )
+    composite_signal=numpy.sum(channel_signals, axis=0)
+    input_signals.append(composite_signal)
+
+s=input_signals[1]
+
+###############################################################################
+# Convert the float values to n-bits
+###############################################################################
+s_bits = []
+for fword in s:
+    re_signed = to_signed(fword.real, COMPLEX_WIDTH)
+    im_signed = to_signed(fword.imag, COMPLEX_WIDTH)
+
+    s_bits.append( complex(re_signed, im_signed) )
+
+s = numpy.array(s_bits)
+print s
+
+###############################################################################
+# Plot the signal
+###############################################################################
+plt.plot(t, s.real, 'b-', t, s.imag, 'r--')
+plt.legend(('real', 'imaginary'))
+plt.show()
+
+###############################################################################
+# Plot FFT
+###############################################################################
+yf = fft(s)
+
+xf = fftfreq(N, T)
+xf = range(NOF_WORDS_PER_BLOCK)
+xf = fftshift(xf)
+yplot = fftshift(yf)
+plt.bar(xf, 1.0/N * np.abs(yplot))
+plt.grid()
+plt.show()
+
+###############################################################################
+# Convert complex floats to concatenated integers
+###############################################################################
+input_signals_concat = []
+for input_signal in input_signals:
+    input_signals_concat.append( concat_complex(input_signal, COMPLEX_WIDTH) )
+
+###############################################################################
+# Interleave 2 lists into one
+###############################################################################
+input_signals_concat_inter = []
+for i in range(NOF_INPUTS):
+    input_signals_concat_inter.append( interleave([input_signals_concat[2*i],input_signals_concat[2*i+1]]) )
+
+###############################################################################
+# Use this list for each block generator
+###############################################################################
+bg_lists = input_signals_concat_inter
+
+###############################################################################
+# Write the HEX files
+###############################################################################
+MEM_WIDTH  = COMPLEX_WIDTH*2
+MEM_DEPTH  = 2*NOF_WORDS_PER_BLOCK # We're interleaving, hence twice the depth
+
+for input_nr in range(NOF_INPUTS):
+    list_to_hex( bg_lists[input_nr], PATH+"/"+FILENAME+'_'+str(input_nr)+".hex", MEM_WIDTH, MEM_DEPTH)
+