If it helps at all the exact tune request I’m using is as follows:
```
uhd::tune_request_t tmp;
tmp.dsp_freq_policy = uhd::tune_request_t::POLICY_MANUAL;
tmp.rf_freq_policy = uhd::tune_request_t::POLICY_MANUAL;
tmp.rf_freq = rf_freq;
tmp.target_freq = min_freq;
tmp.dsp_freq = sign * (tmp.target_freq - tmp.rf_freq);
```
I ensure that rf_freq is equal to what my radio is already tuned to, and that
target_freq is an integer multiple of the master clock offset from rf_freq, but
still within my 160 MHz bandwidth. Sign is either 1 or -1 depending on whether
I’m making a TX or RX retune request.
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