diff --git a/amodem/recv.py b/amodem/recv.py
index 405b723..d58cd2c 100644
--- a/amodem/recv.py
+++ b/amodem/recv.py
@@ -25,7 +25,7 @@ class Receiver(object):
         self.omegas = 2 * np.pi * self.frequencies / config.Fs
         self.Nsym = config.Nsym
         self.Tsym = config.Tsym
-        self.iters_per_update = config.baud  # update sampler once per second
+        self.iters_per_update = 100  # [ms]
         self.modem_bitrate = config.modem_bps
         self.equalizer = equalizer.Equalizer(config)
         self.carrier_index = config.carrier_index
@@ -164,7 +164,7 @@ class Receiver(object):
         freq_err = self._prefix(symbols, gain=gain)
         sampler.freq -= freq_err
 
-        filt = self._train(sampler, order=11, lookahead=6)
+        filt = self._train(sampler, order=11, lookahead=11)
         sampler.equalizer = lambda x: list(filt(x))
 
         bitstream = self._demodulate(sampler, symbols)
diff --git a/tests/test_transfer.py b/tests/test_transfer.py
index 31ee17c..277c96d 100644
--- a/tests/test_transfer.py
+++ b/tests/test_transfer.py
@@ -68,8 +68,8 @@ def test_error():
     run(1024, chan=lambda x: x[:-skip], success=False)
 
 
-@pytest.fixture(params=[sign * drift for sign in (+1, -1)
-                        for drift in (0.1, 1, 10, 100)])
+@pytest.fixture(params=[sign * (10.0 ** exp) for sign in (+1, -1)
+                        for exp in (-1, 0, 1, 2, 3)])
 def freq_err(request):
     return request.param * 1e-6