fix bug after commit 3dfa11b89e6a74e6857c11e3029b372c746d535f .change arfcn2downlink(a,b) to one argument in grgsm_decode and grgsm_capture and grgsm_channelize
diff --git a/apps/grgsm_decode b/apps/grgsm_decode
index 66ecae2..70cd284 100755
--- a/apps/grgsm_decode
+++ b/apps/grgsm_decode
@@ -354,12 +354,12 @@
                 parser.error("ARFCN is not valid in the specified band\n")
             else:
                 arfcn = options.arfcn
-                fc = grgsm.arfcn.arfcn2downlink(arfcn, options.band)
+                fc = grgsm.arfcn.arfcn2downlink(arfcn)
         else:
             arfcn = options.arfcn
             for band in grgsm.arfcn.get_bands():
                 if grgsm.arfcn.is_valid_arfcn(arfcn):
-                    fc = grgsm.arfcn.arfcn2downlink(arfcn, band)
+                    fc = grgsm.arfcn.arfcn2downlink(arfcn)
                     break
     elif options.fc:
         fc = options.fc
diff --git a/apps/helpers/grgsm_capture b/apps/helpers/grgsm_capture
index d14d1e8..8b10c61 100755
--- a/apps/helpers/grgsm_capture
+++ b/apps/helpers/grgsm_capture
@@ -139,11 +139,11 @@
         if self.verbose or self.burst_file:
             self.gsm_receiver.set_cell_allocation([self.arfcn])
             if options.band:
-                new_freq = grgsm.arfcn.arfcn2downlink(self.arfcn, self.band)
+                new_freq = grgsm.arfcn.arfcn2downlink(self.arfcn)
             else:
                 for band in grgsm.arfcn.get_bands():
                     if grgsm.arfcn.is_valid_arfcn(arfcn):
-                        new_freq = grgsm.arfcn.arfcn2downlink(arfcn, band)
+                        new_freq = grgsm.arfcn.arfcn2downlink(arfcn)
                         break
             self.set_fc(new_freq)
 
@@ -236,12 +236,12 @@
                 parser.error("ARFCN is not valid in the specified band\n")
             else:
                 arfcn = options.arfcn
-                fc = grgsm.arfcn.arfcn2downlink(arfcn, options.band)
+                fc = grgsm.arfcn.arfcn2downlink(arfcn)
         else:
             arfcn = options.arfcn
             for band in grgsm.arfcn.get_bands():
                 if grgsm.arfcn.is_valid_arfcn(arfcn):
-                    fc = grgsm.arfcn.arfcn2downlink(arfcn, band)
+                    fc = grgsm.arfcn.arfcn2downlink(arfcn)
                     break
     elif options.fc:
         fc = options.fc
diff --git a/apps/helpers/grgsm_channelize b/apps/helpers/grgsm_channelize
index fb30334..5735a1a 100755
--- a/apps/helpers/grgsm_channelize
+++ b/apps/helpers/grgsm_channelize
@@ -94,7 +94,7 @@
         print("Extracting channels %s, given that the center frequency is at %s" % (str(channels), eng_notation.num_to_str(fc)))
 
         for channel in channels:
-            channel_freq = arfcn.arfcn2downlink(channel, band)
+            channel_freq = arfcn.arfcn2downlink(channel)
             if channel_freq is None:
                 print("Warning: invalid ARFCN %d for band %s" % (channel, band))
                 continue