Threshold auto mode

[vocoder]

When the digital threshold mode is set to auto, how often does the x36 adjust the level?
What triggers the adjusting?

Thanks
73, john

 

[woodpecker]

When the digital threshold mode is set to auto, how often does the x36 adjust the level?
What triggers the adjusting?

Thanks
73, john

I'm not sure it does adjust it, it just selects the auto value which is pre-defined in the firmware.

 

[kruser]

When the digital threshold mode is set to auto, how often does the x36 adjust the level?
What triggers the adjusting?

Thanks
73, john

It is constantly trying to adjust the threshold but it does not work very well for simulcast sites or weaker signal levels. In these cases, it seems to hunt around and often makes things worse.
This can be seen on the prior models, the x96XT series which do not have a true manual mode.
The older x96T models as well as the x36HP models all have true Manual mode settings which should be tried if you are experiencing broken audio.
I'm able to use manual mode here for a couple simulcast sites and that was all it took to clean up decoding and give me clean audio. auto mode just kept trying to adjust but never got it right until the chatter was about done.
For my 996XT models, I simply cannot use them on these sites even after trying to tame down the auto mode adjustment range which is available from a hidden menu. It helps some but not near as well as the true manual mode does that is offered in the other models mentioned above.

I'm not certain what triggers it to adjust but I'd guess it watches the same Decode Error info you can see on the screen while a transmission is being received. If it sees errors, auto mode should try and adjust for zero errors but it seems to overshoot and miss the proper value. In my case, when auto mode is used and the radio is seeing errors. it seems to adjust in the wrong direction starting at 8. I need a value of 6 or 7 but auto mode goes up and tries higher values which just makes things worse. By the time it may try a value below 8, the transmission is usually over.
5 seems to be the lowest possible setting. This is with P25 sites here,

 

[kruser]

I'm not sure it does adjust it, it just selects the auto value which is pre-defined in the firmware.

Wrong, Auto is always hunting for the correct value.
Manual will always use the value you select. Auto mode will often start its search at a value of 8 and then hunt from there. It usually hunts up higher which is not the value I need. I need 7 or 6 which Auto mode seems to rarely try. This is with P25 systems. DMR and NXDN may need values around 9 plus they often seem to work halfway okay in Auto mode. It's the P25 sites here that auto mode does not work worth a darn with.
Probably because it is rare here to see a simulcast NXDN or DMR site.

 

[vocoder]

So thinking about this on the x36, if auto threshold is selected and a level of 7 selected, the auto should start out at 7.

Maybe upman could shed some light on this too?

Thanks for any and all replies on this.
73, john

 

[kruser]

So thinking about this on the x36, if auto threshold is selected and a level of 7 selected, the auto should start out at 7.

Maybe upman could shed some light on this too?

Thanks for any and all replies on this.
73, john

That I'm not sure of.
I know you could try and force the threshold to start at a certain value in the XT series but it never seemed to like values below 8 for some reason.
The hidden menu would allow you to enter a value below 8 plus tighten up the auto range so it did not swing near as wide in the values it tried but I had a heck of a time getting it to use 6 for example.

So I have no idea if setting a decode level other then 8 but leaving the x36HP in Auto really makes a change or not. It would be good to know.
I wonder if one can see this by simply watching the decode screen and see if the threshold does try and start at a different range when you leave it in Auto but change the level.