Noise reduction on receive audio from Allstar

App_rpt-users
1

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG

2

Is it possible you are getting discriminator audio from your radio, but telling asterisk that it is “flat” audio?

That would make everything high pitched and noisy

Ken

···

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34 PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise reduction on receive audio from Allstar

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG

3

If I’m not mistaken, I think he’s
speaking about RF users with weak signals into the node itself. I hear it all
the time, since its digitally processed it sounds less like static and sort of
funky though most times I think it’s more pleasant to listen to than pure
static.

Jeff K0JSC

···

From: Ken
[mailto:ke2n@cs.com]
Sent: Tuesday, May 08, 2012 6:21
PM
To: ‘Eric Guth’
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Noise
reduction on receive audio from Allstar

Is it possible you are getting
discriminator audio from your radio, but telling asterisk that it is
“flat” audio?

That would make everything high pitched
and noisy

Ken

From:
app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34
PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise
reduction on receive audio from Allstar

Folks,

I
notice that when hams are noisy into their Allstar node or the repeater
connected to the Allstar node, the noise on their signal seems to be higher
pitch and accentuated. Some folks are always noisy and therefore
difficult to copy. Does anyone else have this problem, and has anyone
reduced the noise with either software running on the server or some hardware
inserted in between the audio from the URI or CM108 dongle to the transmitter?
I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric
4Z5UG

4

I know I’ve seen this before but I can’t locate
it after searching for nearly an hour. The question; which android sip
client is “best” with app_rpt and can anyone advise on the setup
required on the allstar server? Again, I apologize but I can’t seem
to locate the original post anywhere.

73 de K0JSC

5

Not at all. Noise from an Allstar node sounds completely normal. I suspect, as the other poster stated, the URI is connected to discriminator audio and you’re not doing deemphasis.

···

–
Tim
:wq

On May 8, 2012, at 2:34 PM, Eric Guth wrote:

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter?

6

Is it possible you are getting discriminator audio from your radio, but telling asterisk that it is “flat” audio?

That would make everything high pitched and noisy

Ken

···

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34 PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise reduction on receive audio from Allstar

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG

7

This might be caused by where you’re
injecting your audio into the TX radio. Whats the model/make of the TX radio
you’re using?

···

From: Eric Guth
[mailto:eric@efratnetworks.com]
Sent: Tuesday, May 08, 2012 10:13
PM
To: Ken
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Noise
reduction on receive audio from Allstar

I
am referring to audio coming from the link and transmitted to me on my
node.

73,

Eric.
4Z5UG

On May 9, 2012, at 3:21 AM, “Ken” ke2n@cs.com wrote:

Is it possible you are getting
discriminator audio from your radio, but telling asterisk that it is “flat”
audio?

That would make everything high pitched
and noisy

Ken

From: app_rpt-users-bounces@ohnosec.org
[mailto:app_rpt-users-bounces@ohnosec.org] On
Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34
PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise
reduction on receive audio from Allstar

Folks,

I
notice that when hams are noisy into their Allstar node or the repeater
connected to the Allstar node, the noise on their signal seems to be higher
pitch and accentuated. Some folks are always noisy and therefore
difficult to copy. Does anyone else have this problem, and has anyone
reduced the noise with either software running on the server or some hardware
inserted in between the audio from the URI or CM108 dongle to the transmitter? I
was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric
4Z5UG

8 
Ok,



I’ve found the post (copied below) I was looking for but I’m still messing with this and I don’t seem to be making any progress.  I may have something amiss in either sip.conf or extensions.conf?  Is there a good tutorial for asterisk/centos challenged users like myself?







in your Asterisk Dialplan, you need to invoke Rpt like this:



exten => Something,1,rpt,1234|P   (for Phone with function controlled PTT)



-or-



exten => Something,1,rpt,1234|Pv (for Voice-controlled PTT)



(examples given for node number 1234)



JIM WB6NIL



> * Date: Sat, 14 Jan 2012 13:16:33 -0500*

> * From: [wolthui3 at msu.edu](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)*

> * To: [app_rpt-users at ohnosec.org](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)*

> * Subject: Re: [App_rpt-users] Softphone to the repeater Ports...*

>

> * I would like to do this also.  Is there a document somewhere that shows*

> * how to set it up for private LAN or for direct connection from a SIP*

> * trunk?  I would like to tie my local Asterisk phone system into my*

> * repeater, but not sure on the setup for the Allstar side.*

>

> * Mike*

> * kb8zgl*

>

> * _______________________________________________*

> * App_rpt-users mailing list*

> * [App_rpt-users at ohnosec.org](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)*

> * [http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)*



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···

From:
app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Jeffrey S. Carrier
Sent: Tuesday, May 08, 2012 6:40
PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] SIP smart
phone client

I know I’ve seen this before but I can’t locate
it after searching for nearly an hour. The question; which android sip
client is “best” with app_rpt and can anyone advise on the setup
required on the allstar server? Again, I apologize but I can’t seem
to locate the original post anywhere.

73 de K0JSC

9

I have a Santec FM-240 VHF transceiver. Also known as a Kentec. I am injecting the audio from the URI into the microphone input. I tried injecting into the PL board input with poor results.

···

From: Jeffrey S. Carrier [mailto:jeff.carrier@rmsmsecurity.com]
Sent: Wednesday, May 09, 2012 7:16 AM
To: Eric Guth; Ken
Cc: app_rpt-users@ohnosec.org
Subject: RE: [App_rpt-users] Noise reduction on receive audio from Allstar

This might be caused by where you’re injecting your audio into the TX radio. Whats the model/make of the TX radio you’re using?

From: Eric Guth [mailto:eric@efratnetworks.com]
Sent: Tuesday, May 08, 2012 10:13 PM
To: Ken
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Noise reduction on receive audio from Allstar

I am referring to audio coming from the link and transmitted to me on my node.

73,

Eric. 4Z5UG

On May 9, 2012, at 3:21 AM, “Ken” ke2n@cs.com wrote:

Is it possible you are getting discriminator audio from your radio, but telling asterisk that it is “flat” audio?

That would make everything high pitched and noisy

Ken

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34 PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise reduction on receive audio from Allstar

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG

10

OK – well - you could have an analogous situation there, where you have selected pre-emphasized transmit audio and your rig only needs flat, “microphone’ audio.

Ken

···

From: Eric Guth [mailto:eric@efratnetworks.com]
Sent: Wednesday, May 09, 2012 12:13 AM
To: Ken
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Noise reduction on receive audio from Allstar

I am referring to audio coming from the link and transmitted to me on my node.

73,

Eric. 4Z5UG

On May 9, 2012, at 3:21 AM, “Ken” ke2n@cs.com wrote:

Is it possible you are getting discriminator audio from your radio, but telling asterisk that it is “flat” audio?

That would make everything high pitched and noisy

Ken

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34 PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise reduction on receive audio from Allstar

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG

11

Thanks, Ken. I will check out my config files.

···

From: Ken [mailto:ke2n@cs.com]
Sent: Wednesday, May 09, 2012 11:53 AM
To: Eric Guth
Cc: app_rpt-users@ohnosec.org
Subject: RE: [App_rpt-users] Noise reduction on receive audio from Allstar

OK – well - you could have an analogous situation there, where you have selected pre-emphasized transmit audio and your rig only needs flat, “microphone’ audio.

Ken

From: Eric Guth [mailto:eric@efratnetworks.com]
Sent: Wednesday, May 09, 2012 12:13 AM
To: Ken
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Noise reduction on receive audio from Allstar

I am referring to audio coming from the link and transmitted to me on my node.

73,

Eric. 4Z5UG

On May 9, 2012, at 3:21 AM, “Ken” ke2n@cs.com wrote:

Is it possible you are getting discriminator audio from your radio, but telling asterisk that it is “flat” audio?

That would make everything high pitched and noisy

Ken

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34 PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise reduction on receive audio from Allstar

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG

12

For set up take a look here : http://www.allstarnode.com/viewtopic.php?f=5&t=67
For some reason, I had to make the stanza box contain my user name though.
[zzzzzzzz] ; Change to your title for this type of connection EX: [my-phone]

And I’m using IaxAgent on my Droid X.

···

–
Robert A. Poff
Loganville, PA
WB3AWJ - Allstar 27784
Powered by Linux

13

So multiple transmitters have the bad audio or just one? Your first post implied you had bad audio from the one receiver.

If you want to connect to our hub (node 2530) I’d be happy to give you a signal report.

···

–
Tim
:wq

On May 8, 2012, at 9:13 PM, Eric Guth wrote:

I am referring to audio coming from the link and transmitted to me on my node.

14

This is what I was looking for! Thank
you! I thought I saw one for a sip client somewhere but I’m sure if I did they
work about the same anyway. Its working just fine now. Thanks again.

73 de K0JSC

15

Problem solved.

Ken was right. Thanks Ken. Changing the configuration on the usbradio.conf to flat audio, and not pre-emphasized audio solved the problem and made listening on Allstar much more comfortable. Thanks to all who answered me.

Now - has anybody actually deployed a node with the Dingotel USB Fob? I picked up two units some time back and want to experiment with them.

73,

Eric 4Z5UG

···

From: Ken [mailto:ke2n@cs.com]
Sent: Wednesday, May 09, 2012 11:53 AM
To: Eric Guth
Cc: app_rpt-users@ohnosec.org
Subject: RE: [App_rpt-users] Noise reduction on receive audio from Allstar

OK – well - you could have an analogous situation there, where you have selected pre-emphasized transmit audio and your rig only needs flat, “microphone’ audio.

Ken

From: Eric Guth [mailto:eric@efratnetworks.com]
Sent: Wednesday, May 09, 2012 12:13 AM
To: Ken
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] Noise reduction on receive audio from Allstar

I am referring to audio coming from the link and transmitted to me on my node.

73,

Eric. 4Z5UG

On May 9, 2012, at 3:21 AM, “Ken” ke2n@cs.com wrote:

Is it possible you are getting discriminator audio from your radio, but telling asterisk that it is “flat” audio?

That would make everything high pitched and noisy

Ken

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Eric Guth
Sent: Tuesday, May 08, 2012 5:34 PM
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Noise reduction on receive audio from Allstar

Folks,

I notice that when hams are noisy into their Allstar node or the repeater connected to the Allstar node, the noise on their signal seems to be higher pitch and accentuated. Some folks are always noisy and therefore difficult to copy. Does anyone else have this problem, and has anyone reduced the noise with either software running on the server or some hardware inserted in between the audio from the URI or CM108 dongle to the transmitter? I was thinking a DSP audio filter (more expensive than my whole node).

73,

Eric 4Z5UG