diff --git a/datcom.f90 b/datcom.f90
new file mode 100644
index 000000000..041b81996
--- /dev/null
+++ b/datcom.f90
@@ -0,0 +1,4 @@
+parameter (NSMAX=60*96000)          !Samples per 60 s file
+integer*2 id                        !46 MB: raw data from Linrad timf2
+character*80 fname80
+common/datcom/nutc,newdat2,id(4,NSMAX,2),kbuf,nlost,nlen,fname80