[arm-allstar] Better audio?

[Doug Crompton]

Chris,

 Your remark about pre and deempahsis making little or no change does not make sense. You should definitely notice a difference in changing that.

What code are you using. Earlier versions of the code did not have pre-emphasis. 

Also you have to make sure you uncomment - take the semicolon off and set them to yes and restart Allstar - astres.sh - when you make the change.

The mods are in the howto (hardware) section at hamvoip.org. It involves breaking the lines between the RX and TX internally. It also talks about how to set simpleusb.conf

RX/TX PL is handled by the repeater and ID is turned off in the repeater and supplied by Allstar. 

I recommend the 1.02 (or 1.01) RPi2 code or 1.2.2 BBB code for use with the DR1.
73 Doug
WA3DSP
http://www.crompton.com/hamradio


To: arm-allstar at hamvoip.org
Date: Wed, 20 Apr 2016 09:08:09 -0500
Subject: Re: [arm-allstar] Better audio?
From: arm-allstar at hamvoip.org
CC: wb9rsq at me.com

Better audio?I did play with the de and pre settings but noticed little change.Not sure which mods you are referencing, we did build up the URI interface and as indicated activated the onboard amp.Currently the repeater is completely in remote mode with only the BBB doing the lifting.The audio sounds muddy and dull.No high-end at all. Low-end rolled-off well above 300HZ.I need sighted help so any re-wiring or changes on the DR1X screens depends on when I can get it.  From: arm-allstar [mailto:arm-allstar-bounces at hamvoip.org] On Behalf Of Doug Crompton via arm-allstar
Sent: Wednesday, April 20, 2016 8:46 AM
To: ARM Allstar <arm-allstar at hamvoip.org>
Cc: Doug Crompton <doug at crompton.com>
Subject: Re: [arm-allstar] Better audio? Chris,

  I am very surprised that you are not getting good audio with the DR1X. We have several repeaters in my area using Allstar with that repeater with excellent audio. I assume you are using only analog FM on the repeater? Did you follow the mods I published on hamvoip.org?

simpleusb has very good audio and most problems can be attributed to the radio or settings. I believe the DR1 repeaters need both deemphasis and pre-emphasis set to on. Make sure both are uncommented and set to yes. 
Exactly what is not right with the audio. Too many lows, highs, distorted?

73 Doug
WA3DSP
http://www.crompton.com/hamradioTo: arm-allstar at hamvoip.org
Date: Wed, 20 Apr 2016 08:08:37 -0500
Subject: [arm-allstar] Better audio?
From: arm-allstar at hamvoip.org
CC: wb9rsq at gmail.comSorry about the length ahead of time.I just moved my simplex node to a DR1X repeater and have started to reconfigure much of my node.Since I was using an older radio for the simplex operation I didn’t pay much attention to the audio quality.However now as a repeater system under full allstar control I am quite unhappy with the audio.Some things I don’t understand:The differences and impact of the rx and tx parameters between the simpleusb.conf and the simple_tune_usb.conf don’t seem to be apparent.I toggled the preemphasis parameter in simpleusb.conf but it didn’t seem to matter much.We added the amp power to the URI and at least that increased the levels enough to make the system usable but it also seemed to increase the background noise level going to the TX while keyed even with no audio.Is there a way to add some sort of eq?What parameters would increase the input so that output could be dialed back?I’m including as input items for increase not only OTA audio but tones and local audio and of course allstar audio from external connections.I am running the DR1X with squelch open and the node is ignoring ctcss and carrier detect. Can the allstar control get either of these signals from the DR1X when allstar is the controller?At the moment I’ve got quite a squelch tail!I realize that I could go to the DR1X control mode or add some sort of other external controller but I really wanted to have allstar be the only controller in the mix.Any help would be appreciated.
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