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-rw-r--r--gr-uhd/grc/gen_uhd_usrp_blocks.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/gr-uhd/grc/gen_uhd_usrp_blocks.py b/gr-uhd/grc/gen_uhd_usrp_blocks.py
index 94a1ed84c7..5981bb4c89 100644
--- a/gr-uhd/grc/gen_uhd_usrp_blocks.py
+++ b/gr-uhd/grc/gen_uhd_usrp_blocks.py
@@ -298,6 +298,7 @@ self.\$(id).set_bandwidth(\$bw$(n), $n)
<check>$max_mboards >= \$num_mboards</check>
<check>\$num_mboards > 0</check>
<check>\$nchan >= \$num_mboards</check>
+ <check>(not \$stream_chans()) or (\$nchan == len(\$stream_chans))</check>
<$sourk>
<name>$direction</name>
<type>\$type.type</type>