SQL support

[max-arnold]

Add SQL based on RSSI (likely per-band and/or per-mode). Not sure how practical that would be.

[G8PTN]

Hi Max,
For information, it would probably be better to base the squelch control on SNR rather than RSSI.
I think the SI4732 seek is based mainly on SNR thresholds (see AN332), as is the squelch on most modern receivers/transceivers.
73, Dave

[denka977]

This firmware (https://github.com/konstcranky/ATS_MINI) implements SQL tied to the signal level. This is very useful for listening to truckers on CB frequencies! Please also implement this feature in your firmware, because this is a useful functionality that should be distributed.

[denka977]

Since your firmware has become the main one, with the greatest prospects in development for the devices of many people, I ask you to add support for SQL settings with the ability to select the level. In the citizen band (CB) range, this would allow using the device while driving in a car.
It is necessary to make the citizen band (CB) more useful, thank you!

[max-arnold]

The current plan is to add a sliding window buffer (12 samples or so) to push the SNR (and RSSI in another buffer) measurements every 100mS. The display indicators could use the most recent value from the buffer and will be updated every 12th sample (and only if it is different from the oldest value in the buffer). Squelch could do some averaging over the last X values (less than 12).

Also SQL should be explicitly unmuted before going to the CPU Sleep mode, otherwise there won't be any sound.

When the sound is muted by SQL, the Volume value in the sidebar will be highlighted accordingly.

A remaining question is whether to store the SQL level in EEPROM at all, store it once, per-mode or per-band...

[G8PTN]

Hi Max,
For information, on radios like the UV-K5, the squelch for AM/FM (Transceiver chip BK4819) is normally set at various levels, with associated parameters for each level. Example below.

Normally squelch is done on a global basis.
The behaviour may depend on the AGC settings.
You will probably need to experiment to see how quickly the squelch reacts.
Fast polling of the SI4732 may cause some interference.

73, Dave

[max-arnold]

The feature was released in 2.22. Uses rssi under the hood because snr is always zero in ssb

[EmEiBee]

Thanks for the squelch! Long awaited and gladly received.
It's still a bit harsh and too fast for my taste, but otherwise works great.