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-rw-r--r--host/lib/usrp/dboard/db_dbsrx.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/host/lib/usrp/dboard/db_dbsrx.cpp b/host/lib/usrp/dboard/db_dbsrx.cpp
index 0b8b4db83..aecd7249d 100644
--- a/host/lib/usrp/dboard/db_dbsrx.cpp
+++ b/host/lib/usrp/dboard/db_dbsrx.cpp
@@ -236,8 +236,10 @@ void dbsrx::set_lo_freq(double target_freq){
bool update_filter_settings = false;
//choose refclock
std::vector<double> clock_rates = this->get_iface()->get_clock_rates(dboard_iface::UNIT_RX);
+ const double max_clock_rate = std::sorted(clock_rates).back();
BOOST_FOREACH(ref_clock, std::reversed(std::sorted(clock_rates))){
if (ref_clock > 27.0e6) continue;
+ if (size_t(max_clock_rate/ref_clock)%2 == 1) continue; //reject asymmetric clocks (odd divisors)
//choose m_divider such that filter tuning constraint is met
m = 31;