diff --git a/grc/demapping/gsm_tch_f_chans_demapper.xml b/grc/demapping/gsm_tch_f_chans_demapper.xml
index c87776a..33b4153 100644
--- a/grc/demapping/gsm_tch_f_chans_demapper.xml
+++ b/grc/demapping/gsm_tch_f_chans_demapper.xml
@@ -3,7 +3,7 @@
   <name>TCH/F Demapper</name>
   <key>gsm_tch_f_chans_demapper</key>
   <import>import grgsm</import>
-  <make>grgsm.tch_f_chans_demapper($timeslot_nr, $tch_type, $tch_h_channel)</make>
+  <make>grgsm.tch_f_chans_demapper($timeslot_nr)</make>
 
   <param>
     <name>Timeslot</name>
@@ -13,31 +13,6 @@
     <hide>part</hide>
   </param>
 
-  <param>
-    <name>TCH Type</name>
-    <key>tch_type</key>
-    <value>0</value>
-    <type>int</type>
-    <hide>part</hide>
-    <option>
-      <name>Full rate</name>
-      <key>0</key>
-    </option>
-    <option>
-      <name>Half rate</name>
-      <key>1</key>
-    </option>
-  </param>
-
-  <param>
-    <name>TCH/H Channel</name>
-    <key>tch_h_channel</key>
-    <value>0</value>
-    <type>int</type>
-    <hide>#if $tch_type() == 0 then 'all' else 'none'#</hide>
-  </param>
-  <check>$tch_h_channel() &gt; -1 and $tch_h_channel() &lt; 2</check>
-
   <sink>
     <name>bursts</name>
     <type>message</type>