ATS-20+ SSB mode noise issue

[cmacia-mn]

I received an ATS-20+ this week and upgraded its firmware to SI473X_ALL_IN_ONE_OLED_RDS_CHINESE_V8. Thank you very much Ricardo. Fantastic job!!!

The radio is working great in all modes and the buttons behaving as documented in the User Manual. However, I noticed the following minor issue when the radio is in SSB mode.

If AGC is enabled, the radio has a faint white noise even when muted. If I change AGC to any 'Atxx' value (At20 for example) the white noise disappears immediately. However, as soon as I change the frequency (from 14250 to 14251, for example) the white noise returns but it disappears again as soon as I change the attenuation to another value such as At21, but the noise reappears when the frequency is changed again and so on.

I would also point out that if the setting is AGC, the white noise is always there. The only way to get rid of it is by setting it to an Atxx value with the caveat explained above.

I don't see this problem or hear this noise at all in the AM, MW, LW or FM modes.

Has anybody else noticed this issue?