From 1d2a0f39ac1b3503915a60b9d0adafae866156d8 Mon Sep 17 00:00:00 2001
From: Steven Franke <s.j.franke@icloud.com>
Date: Sun, 3 May 2020 08:51:55 -0500
Subject: [PATCH] Tweak SNR calibration for better tracking at low SNR.

---
 lib/ft8/ft8b.f90 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ft8/ft8b.f90 b/lib/ft8/ft8b.f90
index 89d2e448c..68b06a645 100644
--- a/lib/ft8/ft8b.f90
+++ b/lib/ft8/ft8b.f90
@@ -445,7 +445,7 @@ subroutine ft8b(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,nzhsym,lapon,     &
      xsnr2=0.001
      arg=xsig/xnoi-1.0 
      if(arg.gt.0.1) xsnr=arg
-     arg=xsig/xbase/2.6e6-1.0
+     arg=xsig/xbase/3.0e6-1.0
      if(arg.gt.0.1) xsnr2=arg
      xsnr=10.0*log10(xsnr)-27.0
      xsnr2=10.0*log10(xsnr2)-27.0