BCD996T P25 Threshold Level Tuning

[county]

Good Morning-

I haven't found the detail I'm seeking when doing forum searches.. so thought I'd pose my questions here.

I'm running the latest firmware (03.01) Here are my questions:

1. Can someone further explain the P25 Threshold Level tuning options for the 996T? I'm having a hard-time interpreting the instructions in the manual. Is there just one parameter being adjusted (P25 Level, 1-20)?

2. In the "Adjust P25 Level" option, what do the 3 voltage levels on the bottom line indicate, and how does that help with the tuning? Is it just the ERR value on the 2nd line from the bottom that assists with the tuning? Despite adjusting the P25 level in this mode, it still dynamically changes during subsequent transmissions (guess that's the "auto" feature working), but I see no way to confirm what the optimized start-point is.

3. It looks like you can't change P25 Threshold Level on a per-site basis through the embedded menus, is there a workaround (aside from using the software of course)?

Next, I plan to play with REF GAIN, and RES TIME, we'll see how that goes.

THANKS in advance for your input!

 

[cws]

Go to the P25 Optimizing link on this page
http://marksscanners.com/330_396/330_396.html
and follow links on it, too.

 

[trunker]

Or go to the 996T page...

http://marksscanners.com/996/996.html#optomizing

 

[UPMan]

In version 3.01, the P25 AUTO setting does nothing. MAN will still set a fixed decode level.

The other settings you mention are for AGC and have nothing to do with P25 decoding...(I mention this because I often see people suggest to mess with these settings in order to iimprove P25 performance; the primary way to improve P25 performance is to improve reception.)

 

[davidmc36]

the primary way to improve P25 performance is to improve reception.)

Quite true. I played around for quite a few days with my own antenna designs till I hit on one that gave better reception and hence better digital decoding. I can get quite a ways from the sites now and still have good audio.