From 8b9b71c8946b1f8011eacf593da5f5615de95529 Mon Sep 17 00:00:00 2001
From: Joe Taylor <joe@princeton.edu>
Date: Fri, 4 Dec 2020 15:37:54 -0500
Subject: [PATCH] Fix the "off by one" issue in measuring f0 for list decodes.

---
 lib/q65_sync.f90 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/q65_sync.f90 b/lib/q65_sync.f90
index 62e3a72e6..d761fd044 100644
--- a/lib/q65_sync.f90
+++ b/lib/q65_sync.f90
@@ -142,7 +142,7 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol,    &
         ijpk=maxloc(ccf)
         ipk=ijpk(1)-ia-1
         jpk=ijpk(2)-53-1     
-        f0=nfqso + ipk*df
+        f0=nfqso + (ipk-1)*df
         xdt=jpk*dtstep
         imsg_best=imsg
      endif