diff --git a/grc/blocks/blks2_dxpsk2_demod.xml b/grc/blocks/blks2_dxpsk2_demod.xml
index ce8305c..5d6ae9f 100644
--- a/grc/blocks/blks2_dxpsk2_demod.xml
+++ b/grc/blocks/blks2_dxpsk2_demod.xml
@@ -11,7 +11,6 @@
 	<make>blks2.$(type)2_demod(
 	samples_per_symbol=$samples_per_symbol,
 	excess_bw=$excess_bw,
-	costas_alpha=$costas_alpha,
 	timing_alpha=$timing_alpha,
 	timing_max_dev=$timing_max_dev,
 	gray_code=$gray_code,
@@ -19,8 +18,6 @@
 	log=$log,
 	sync_out=$sync_out,
 )</make>
-	<callback>clock_recov.set_alpha($costas_alpha)</callback>
-	<callback>clock_recov.set_beta(0.25*$costas_alpha**2)</callback>
 	<callback>time_recov.set_alpha($timing_alpha)</callback>
 	<param>
 		<name>Type</name>
@@ -48,12 +45,6 @@
 		<type>real</type>
 	</param>
 	<param>
-		<name>Costas Alpha</name>
-		<key>costas_alpha</key>
-		<value>0.175</value>
-		<type>real</type>
-	</param>
-	<param>
 		<name>Timing Alpha</name>
 		<key>timing_alpha</key>
 		<value>0.100</value>