diff --git a/hdl/Decimator_to_SSS_detector.sv b/hdl/Decimator_to_SSS_detector.sv
index 3c8b5e7e8..e75b99f75 100644
--- a/hdl/Decimator_to_SSS_detector.sv
+++ b/hdl/Decimator_to_SSS_detector.sv
@@ -18,6 +18,7 @@ module Decimator_to_SSS_detector
     parameter TAP_FILE_2 = "",
     parameter NFFT = 8,
     parameter MULT_REUSE = 0,
+    parameter INITIAL_DETECTION_SHIFT = 4,
 
     localparam FFT_LEN = 2 ** NFFT,
     localparam CIC_RATE = FFT_LEN / 128,    
@@ -101,7 +102,8 @@ PSS_detector #(
     .TAP_FILE_1(TAP_FILE_1),
     .TAP_FILE_2(TAP_FILE_2),
     .ALGO(ALGO),
-    .MULT_REUSE(MULT_REUSE)
+    .MULT_REUSE(MULT_REUSE),
+    .INITIAL_DETECTION_SHIFT(INITIAL_DETECTION_SHIFT)
 )
 PSS_detector_i(
     .clk_i(clk_i),
diff --git a/tests/test_Decimator_Correlator_PeakDetector_FFT.py b/tests/test_Decimator_Correlator_PeakDetector_FFT.py
index 04c5364a8..447fc4854 100644
--- a/tests/test_Decimator_Correlator_PeakDetector_FFT.py
+++ b/tests/test_Decimator_Correlator_PeakDetector_FFT.py
@@ -371,7 +371,7 @@ def test(IN_DW, OUT_DW, TAP_DW, ALGO, WINDOW_LEN, HALF_CP_ADVANCE, NFFT, USE_TAP
     parameters['MULT_REUSE'] = MULT_REUSE
     parameters['INITIAL_DETECTION_SHIFT'] = INITIAL_DETECTION_SHIFT
     parameters_no_taps = parameters.copy()
-    folder = 'Decimator_to_FFT_' + '_'.join(('{}={}'.format(*i) for i in parameters_no_taps.items()))
+    folder = 'Decimator_to_FFT_' + '_'.join(('{}={}'.format(*i) for i in parameters_no_taps.items())) + '_' + FILE
     sim_build= os.path.join('sim_build', folder)
     os.environ['TEST_FILE'] = FILE
 
diff --git a/tests/test_Decimator_to_SSS_detector.py b/tests/test_Decimator_to_SSS_detector.py
index 6ec1e7ff0..8905ec6b0 100644
--- a/tests/test_Decimator_to_SSS_detector.py
+++ b/tests/test_Decimator_to_SSS_detector.py
@@ -72,16 +72,38 @@ def fft_dbs(self, fft_signal):
 @cocotb.test()
 async def simple_test(dut):
     tb = TB(dut)
+    FILE = '../../tests/' + os.environ['TEST_FILE'] + '.sigmf-data'
     CFO = int(os.getenv('CFO'))
-    handle = sigmf.sigmffile.fromfile('../../tests/30720KSPS_dl_signal.sigmf-data')
+    handle = sigmf.sigmffile.fromfile(FILE)
     waveform = handle.read_samples()
-    fs = 30720000
+    fs = handle.get_global_field(sigmf.SigMFFile.SAMPLE_RATE_KEY)
+    NFFT = tb.NFFT
+    FFT_LEN =  2 ** NFFT
+
+    if os.environ['TEST_FILE'] == '30720KSPS_dl_signal':
+        expected_N_id_1 = 69
+        expected_N_id_2 = 2
+        MAX_TX = 2000 * FFT_LEN // 256
+    elif os.environ['TEST_FILE'] == '772850KHz_3840KSPS_low_gain':
+        expected_N_id_1 = 291
+        expected_N_id_2 = 0
+        MAX_TX = 5000 * FFT_LEN // 256
+        delta_f = -4e3
+        waveform = waveform * np.exp(-1j*(2*np.pi*delta_f/fs*np.arange(waveform.shape[0])))
+    else:
+        file_string = os.environ['TEST_FILE']
+        assert False, f'test file {file_string} is not supported'
+    
     print(f'CFO = {CFO} Hz')
     waveform *= np.exp(np.arange(len(waveform)) * 1j * 2 * np.pi * CFO / fs)
     waveform /= max(waveform.real.max(), waveform.imag.max())
-    dec_factor = 2048 // (2 ** tb.NFFT)
-    waveform = scipy.signal.decimate(waveform, dec_factor, ftype='fir')  # decimate to 3.840 MSPS
-    waveform /= max(waveform.real.max(), waveform.imag.max())
+    dec_factor = int((2048 * fs // 30720000) // (2 ** tb.NFFT))
+    assert dec_factor != 0, f'NFFT = {tb.NFFT} and fs = {fs} is not possible!'
+    print(f'test_file = {FILE} with {len(waveform)} samples')
+    print(f'sample_rate = {fs}, decimation_factor = {dec_factor}')
+    if dec_factor > 1:
+        fs = fs // dec_factor
+        waveform = scipy.signal.decimate(waveform, dec_factor, ftype='fir')  # decimate to 3.840 MSPS (if NFFT = 8)    
     waveform *= (2 ** (tb.IN_DW // 2 - 1) - 1)
     waveform = waveform.real.astype(int) + 1j * waveform.imag.astype(int)
 
@@ -94,10 +116,7 @@ async def simple_test(dut):
     received_PBCH = []
     received_SSS = []
 
-    NFFT = tb.NFFT
-    FFT_LEN =  2 ** NFFT
     MAX_CLK_CNT = 100000 * FFT_LEN // 256
-    MAX_TX = 2000 * FFT_LEN // 256
     if NFFT == 8:
         DETECTOR_LATENCY = 18
     elif NFFT == 9:
@@ -150,19 +169,21 @@ async def simple_test(dut):
             received_SSS.append(_twos_comp(dut.m_axis_out_tdata.value.integer & (2**(FFT_OUT_DW//2) - 1), FFT_OUT_DW//2)
                 + 1j * _twos_comp((dut.m_axis_out_tdata.value.integer>>(FFT_OUT_DW//2)) & (2**(FFT_OUT_DW//2) - 1), FFT_OUT_DW//2))
 
+    assert clk_cnt < MAX_CLK_CNT, "timeout, did not receive enough data"
     assert len(received_SSS) == SSS_LEN
     
     print(f'detected N_id_1 = {detected_N_id_1}')
     print(f'detected N_id = {detected_N_id}')
-    assert detected_N_id == 209
-    assert detected_N_id_1 == 69
+    expected_N_id = expected_N_id_1 * 3 + expected_N_id_2
+    assert detected_N_id == expected_N_id
+    assert detected_N_id_1 == expected_N_id_1
 
     corr = np.zeros(335)
     for i in range(335):
-        sss = py3gpp.nrSSS(i)
+        sss = py3gpp.nrSSS(i * 3 + expected_N_id_2)
         corr[i] = np.abs(np.vdot(sss, received_SSS))
     detected_NID1 = np.argmax(corr)
-    assert detected_NID1 == 209
+    assert detected_NID1 == expected_N_id_1
 
 
 # bit growth inside PSS_correlator is a lot, be careful to not make OUT_DW too small !
@@ -176,7 +197,8 @@ async def simple_test(dut):
 @pytest.mark.parametrize("USE_TAP_FILE", [1])
 @pytest.mark.parametrize("NFFT", [8])
 @pytest.mark.parametrize("MULT_REUSE", [0])
-def test(IN_DW, OUT_DW, TAP_DW, ALGO, WINDOW_LEN, CFO, HALF_CP_ADVANCE, USE_TAP_FILE, NFFT, MULT_REUSE):
+@pytest.mark.parametrize("INITIAL_DETECTION_SHIFT", [4])
+def test(IN_DW, OUT_DW, TAP_DW, ALGO, WINDOW_LEN, CFO, HALF_CP_ADVANCE, USE_TAP_FILE, NFFT, MULT_REUSE, INITIAL_DETECTION_SHIFT, FILE = '30720KSPS_dl_signal'):
     dut = 'Decimator_to_SSS_detector'
     module = os.path.splitext(os.path.basename(__file__))[0]
     toplevel = dut
@@ -237,11 +259,13 @@ def test(IN_DW, OUT_DW, TAP_DW, ALGO, WINDOW_LEN, CFO, HALF_CP_ADVANCE, USE_TAP_
     parameters['USE_TAP_FILE'] = USE_TAP_FILE
     parameters['NFFT'] = NFFT
     parameters['MULT_REUSE'] = MULT_REUSE
+    parameters['INITIAL_DETECTION_SHIFT'] = INITIAL_DETECTION_SHIFT
     os.environ['CFO'] = str(CFO)
     parameters_dirname = parameters.copy()
     parameters_dirname['CFO'] = CFO
-    folder = '_'.join(('{}={}'.format(*i) for i in parameters_dirname.items()))
+    folder = '_'.join(('{}={}'.format(*i) for i in parameters_dirname.items())) + '_' + FILE
     sim_build='sim_build/' + folder
+    os.environ['TEST_FILE'] = FILE
 
     FFT_LEN = 2 ** NFFT
     CP_LEN = 18 * FFT_LEN // 256
@@ -283,7 +307,15 @@ def test(IN_DW, OUT_DW, TAP_DW, ALGO, WINDOW_LEN, CFO, HALF_CP_ADVANCE, USE_TAP_
         waves=True
     )
 
+@pytest.mark.parametrize("FILE", ["772850KHz_3840KSPS_low_gain"])
+def test_recording(FILE):
+    test(IN_DW = 32, OUT_DW = 32, TAP_DW = 32, ALGO = 0, WINDOW_LEN = 8, CFO=0, HALF_CP_ADVANCE = 1, NFFT = 8, USE_TAP_FILE = 1,
+        MULT_REUSE = 0, INITIAL_DETECTION_SHIFT = 3, FILE = FILE)
+
 if __name__ == '__main__':
     os.environ['PLOTS'] = '1'
     os.environ['SIM'] = 'verilator'
-    test(IN_DW = 32, OUT_DW = 32, TAP_DW = 32, ALGO = 0, WINDOW_LEN = 8, CFO=0, HALF_CP_ADVANCE = 1, USE_TAP_FILE = 1, NFFT = 9, MULT_REUSE = 0)
+    test(IN_DW = 32, OUT_DW = 32, TAP_DW = 32, ALGO = 0, WINDOW_LEN = 8, CFO=0, HALF_CP_ADVANCE = 1, USE_TAP_FILE = 1, NFFT = 8,
+        MULT_REUSE = 0, INITIAL_DETECTION_SHIFT = 3, FILE = '772850KHz_3840KSPS_low_gain')
+    # test(IN_DW = 32, OUT_DW = 32, TAP_DW = 32, ALGO = 0, WINDOW_LEN = 8, CFO=0, HALF_CP_ADVANCE = 1, USE_TAP_FILE = 1, NFFT = 9,
+    #     MULT_REUSE = 0, INITIAL_DETECTION_SHIFT = 4)