Fix for BUG #527: N200: 50 Msps results in two tones

- Adjusted check to enable first half-band filter only if the rate is decimated enough between the CIC and other half-band filter

1 files changed, 2 insertions, 1 deletions

diff --git a/host/lib/usrp/cores/rx_dsp_core_200.cpp b/host/lib/usrp/cores/rx_dsp_core_200.cpp
index 2fdc220b5..2e5ca8e7a 100644
--- a/host/lib/usrp/cores/rx_dsp_core_200.cpp
+++ b/host/lib/usrp/cores/rx_dsp_core_200.cpp
@@ -176,7 +176,8 @@ public:
 
         //determine which half-band filters are activated
         int hb0 = 0, hb1 = 0;
-        if (decim % 2 == 0){
+        // hb0 can only be enabled if the rate will be decimated by at least 2 between the CIC and hb1
+        if (decim >= 4 && decim % 2 == 0){
             hb0 = 1;
             decim /= 2;
         }