As per the Yaesu FT-710 manual, the Digital Noise Reduction (DNR) system is designed to reduce the level of ambient noise found on the HF and 50 MHz bands. The (DNR) system is especially effective during SSB operation. Any of 15 different noise-reduction algorithms can be selected; each of these algorithms was created to deal with a different noise profile. You will want to experiment with the DNR system to find the best setting corresponding to the noise currently being experienced.
The DNR function can be operated individually for VFO-A band and VFO-B.
But have you ever tried this trick with the RF-Gain. Have a look at this video to see more:
Press the [DNR] key to enable the DNR operation. To disable DNR operation, press the [DNR] key once more. If you turn your RF gain back to 12 o’clock, it will sound super.
I would love to hear your views on this, and how you have used it. Please like or comment below.
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VK3TBS 
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