Make DBSRX* set default bandwidth based on codec rate

2 files changed, 7 insertions, 2 deletions

diff --git a/host/lib/usrp/dboard/db_dbsrx.cpp b/host/lib/usrp/dboard/db_dbsrx.cpp
index ff4bce20d..846597f06 100644
--- a/host/lib/usrp/dboard/db_dbsrx.cpp
+++ b/host/lib/usrp/dboard/db_dbsrx.cpp
@@ -193,7 +193,8 @@ dbsrx::dbsrx(ctor_args_t args) : rx_dboard_base(args){
     this->send_reg(0x0, 0x5);
 
     //set defaults for LO, gains, and filter bandwidth
-    _bandwidth = 33e6;
+    double codec_rate = this->get_iface()->get_codec_rate(dboard_iface::UNIT_RX);
+    _bandwidth = 0.8*codec_rate/2.0; // default to anti-alias at different codec_rate
 
     ////////////////////////////////////////////////////////////////////
     // Register properties
diff --git a/host/lib/usrp/dboard/db_dbsrx2.cpp b/host/lib/usrp/dboard/db_dbsrx2.cpp
index 01eec133f..517b7b183 100644
--- a/host/lib/usrp/dboard/db_dbsrx2.cpp
+++ b/host/lib/usrp/dboard/db_dbsrx2.cpp
@@ -214,9 +214,13 @@ dbsrx2::dbsrx2(ctor_args_t args) : rx_dboard_base(args){
         .set(true); //always enabled
     this->get_rx_subtree()->create<bool>("use_lo_offset")
         .set(false);
+
+    double codec_rate = this->get_iface()->get_codec_rate(dboard_iface::UNIT_RX);
+
     this->get_rx_subtree()->create<double>("bandwidth/value")
         .coerce(boost::bind(&dbsrx2::set_bandwidth, this, _1))
-        .set(2.0*40.0e6); //bandwidth in lowpass, convert to complex bandpass
+        .set(2.0*(0.8*codec_rate/2.0)); //bandwidth in lowpass, convert to complex bandpass
+                                        //default to anti-alias at different codec_rate
     this->get_rx_subtree()->create<meta_range_t>("bandwidth/range")
         .set(dbsrx2_bandwidth_range);