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-rw-r--r--gr-qtgui/grc/qtgui_sink_x.block.yml4
1 files changed, 4 insertions, 0 deletions
diff --git a/gr-qtgui/grc/qtgui_sink_x.block.yml b/gr-qtgui/grc/qtgui_sink_x.block.yml
index 676a70764..2a20eead9 100644
--- a/gr-qtgui/grc/qtgui_sink_x.block.yml
+++ b/gr-qtgui/grc/qtgui_sink_x.block.yml
@@ -103,6 +103,10 @@ outputs:
optional: true
hide: ${ not showports }
+asserts:
+- ${fftsize >= 32 and fftsize <= 32768}
+- ${not (fftsize & (fftsize -1))}
+
templates:
imports: |-
from PyQt5 import Qt