Optimal P25 Audio Setting Astro Radios

[snapple4th]

All,

Please read https://www.p25.ca/archive/index.php/t-75.html

What do you think? Anyone have a great template that works for law enforcement related applications in regard to the digital audio settings especially with a shoulder mic?

I have done some tweaking with mine but now the audio seems too low.

What are some setting that you think would work best?

Thanks.

 

[Mars_P25]

You haven't specified which radio or platform you're attempting to tweak. If you're using the ASTRO Saber/XTS3000, I recommend DISABLING analog AGC, if you're finding the audio is too low. This advice is for ANALOG ONLY. Leave AGC enabled for digital.

For whatever the reason, the AGC recovery time on analog is too long. When you say a loud P, T or B (blowing into mic) it will knock the audio down, and it takes about 3 seconds to come back up.

Feel free to sign up on P25.ca and continue the conversation over there. Even Lindsay is a member

 

[snapple4th]

No problem, Its P25 XTL2500 and XTS1500. So digital audio on the astro platform. I will also post this at the othersite.

 

[Mars_P25]

OK. The ASTRO25 family is different, in terms of the optimization. Disregard what I said about disabling analog AGC, as that advice only applies to the ASTRO portable line. (ASTRO Saber and XTS3000).

For ASTRO25, continue using AGC, but tweak the OUTPUT gain until you get the amplitude you're satisfied with. This setting processes audio after it leaves the DSP. It does not affect input gain on the mic.

For TOTAL gain, use a minimum of +3dB. You may wish to go higher, but that will also increase background noise. (This is the input gain on the mic).

As noted above, complete discussion of the ASTRO25 family AGC is here: https://www.p25.ca/threads/75-Motorola-ASTRO25-Optimize-your-audio-settings

I recommend customizing the audio gain to each specific environment. i.e. don't program radios that'll be used for frieground operation, with the same AGC settings as the EMS or PD radios. Same deal with aeronautical portables (if any in-use).