diff --git a/Data/FILTERS/SPASS/SPASS_transmission.xcat b/Data/FILTERS/SPASS/SPASS_transmission.xcat
new file mode 100644
index 0000000..06fcd67
--- /dev/null
+++ b/Data/FILTERS/SPASS/SPASS_transmission.xcat
@@ -0,0 +1,12 @@
+\Written by JPB
+\SPASS filter transmission
+\entered by hand to mimic square filter around 2.3 GHz width 8 MHz
+\Filters are assumed square shape
+\Frequency in GHz
+|FREQUENCY  |TRANSMISSION |
+|real       |real         |
+|NULL       |NULL         |
+2.2959999   0.00000
+2.296       1.00000       
+2.304       1.00000
+2.3040001   0.00000
--
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