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
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
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
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
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
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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
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
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<mailto: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> [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<mailto: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
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
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]<mailto:[mailto:eric@efratnetworks.com]> Sent: Tuesday, May 08, 2012 10:13 PM To: Ken Cc: app_rpt-users@ohnosec.org<mailto: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<mailto: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> [mailto:app_rpt-users-bounces@ohnosec.org]<mailto:[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<mailto: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
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
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]<mailto:[mailto:eric@efratnetworks.com]> Sent: Wednesday, May 09, 2012 12:13 AM To: Ken Cc: app_rpt-users@ohnosec.org<mailto: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<mailto: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> [mailto:app_rpt-users-bounces@ohnosec.org]<mailto:[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<mailto: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
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]<mailto:[mailto:eric@efratnetworks.com]> Sent: Wednesday, May 09, 2012 12:13 AM To: Ken Cc: app_rpt-users@ohnosec.org<mailto: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<mailto: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> [mailto:app_rpt-users-bounces@ohnosec.org]<mailto:[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<mailto: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
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.
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?
participants (5)
-
Eric Guth -
Jeffrey S. Carrier -
Ken -
Robert Poff -
Tim Sawyer