RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Computer Aided Monitoring and Programming > Streaming / Broadcasting / Audio Recording


Streaming / Broadcasting / Audio Recording - Interested in putting your scanner online for others to hear? Want to listen to other radios on the internet. This forum is here for you to discuss these topics related to streaming scanners online.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 08-21-2018, 7:12 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default Interference

My feed is setting a lot of buzzing and humming while Rxing, are you able to assist me?
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 08-21-2018, 7:15 AM
jonwienke's Avatar
Member
   
Join Date: Jul 2014
Location: PA
Posts: 8,884
Default

What scanner? If a Uniden, you need a ground loop isolator between the scanner and computer, or you will have all kinds of issues, up to and including burning out the amplifier.
__________________
Gone camping.
Reply With Quote
  #3 (permalink)  
Old 08-21-2018, 7:22 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Yeah, a got ground loop isolator and the Scanner is plugged into a Raspberry Pi. Should I look that into the Pi does the direction of group loop need to be plugged into?
Reply With Quote
  #4 (permalink)  
Old 08-21-2018, 7:22 AM
baj76's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Feb 2007
Location: Columbus,Ohio
Posts: 195
Default

in my opinion every scanner needs a ground loop isolator between the scanner and computer,
Reply With Quote
  #5 (permalink)  
Old 08-21-2018, 7:25 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Quote:
Originally Posted by baj76 View Post
in my opinion every scanner needs a ground loop isolator between the scanner and computer,
In my case the raspberry pi right?

Sent from my SM-N950F using Tapatalk
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 08-21-2018, 7:26 AM
baj76's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Feb 2007
Location: Columbus,Ohio
Posts: 195
Default

yes
Reply With Quote
  #7 (permalink)  
Old 08-21-2018, 7:28 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Does it matter what direction it goes in?

Sent from my SM-N950F using Tapatalk
Reply With Quote
  #8 (permalink)  
Old 08-21-2018, 7:36 AM
jonwienke's Avatar
Member
   
Join Date: Jul 2014
Location: PA
Posts: 8,884
Default

It shouldn't if the isolator is a 1:1 transformer with no connection between the windings. Does the isolator have mono or stereo plugs?
__________________
Gone camping.
Reply With Quote
  #9 (permalink)  
Old 08-21-2018, 7:38 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Quote:
Originally Posted by jonwienke View Post
It shouldn't if the isolator is a 1:1 transformer with no connection between the windings. Does the isolator have mono or stereo plugs?
This what I'm using.
https://www.jaycar.co.nz/ground-loop...3-5mm/p/AA3086

Sent from my SM-N950F using Tapatalk
Reply With Quote
  #10 (permalink)  
Old 08-21-2018, 5:02 PM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Still buzzing after installing the isolator. But to be honest it maybe because I accidentally have the volume up to loud.

Sent from my SM-N950F using Tapatalk
Reply With Quote
  #11 (permalink)  
Old 08-21-2018, 9:57 PM
RFI-EMI-GUY's Avatar
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2013
Posts: 2,449
Default

Quote:
Originally Posted by baj76 View Post
in my opinion every scanner needs a ground loop isolator between the scanner and computer,
Absolutely true. and should be a transformer type, not cheap capacitor types like sold on Amazon. You want the radio speaker output to see a transformer winding that is magnetically coupled to another winding. There should be no DC leakage between the two. The reasons are many, but primarily the new receivers have a DC coupled output that if shorted to ground or DC positive, will blow the output amp. And if it doesn't you will have lots of noise and distortion. The other benefit is that you will avoid a ground loop (HUM), and you won't damage your sound card.

If you buy a proper isolator made for stereo, you can run two receivers through it.

I don't know why this isn't stressed in the radio manuals. They just gloss over it.
__________________
"Have Spectrum Analyzer, - Will travel" "Standby for Traffic, Now Going Red"
Reply With Quote
  #12 (permalink)  
Old 08-22-2018, 5:03 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Still, need some assistance please guys.
Reply With Quote
  #13 (permalink)  
Old 08-22-2018, 5:28 AM
kma371's Avatar
Global DB Admin
  RadioReference Database Admininstrator
Database Admin
 
Join Date: Feb 2001
Location: Central Valley, CA
Posts: 5,959
Default

.....
Reply With Quote
  #14 (permalink)  
Old 08-22-2018, 7:37 AM
ProScan's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jul 2006
Location: Ontario, Calif.
Posts: 2,836
Default

Quote:
Originally Posted by Dark_Hunter View Post
Still, need some assistance please guys.
Can you post a link to your feed so we can hear what kind of buzzing if it's 60 cycles.

Isolations transformers will fix the buzzing if caused by a ground loop condition. A power supply filtering problem can cause humming conditions too and can not be fixed by an isolation transformer. If you have a portable scanner, run it on batteries for a test to see if the buzzing goes away.

Also if you have a multimeter, check between the primary and secondary side don't have any resistance due to a short or miswire.

{edit} Also it's possible you are overdriving the sound input on your device. turn down the scanner audio level to see if the buzzing goes away.
__________________
Most Popular & Feature-Rich Scanner Software For The Uniden's
ProScan - RadioFeed Home Page
bob@proscan.org

Last edited by ProScan; 08-22-2018 at 8:03 AM..
Reply With Quote
  #15 (permalink)  
Old 08-22-2018, 2:39 PM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Quote:
Originally Posted by ProScan View Post
Can you post a link to your feed so we can hear what kind of buzzing if it's 60 cycles.

Isolations transformers will fix the buzzing if caused by a ground loop condition. A power supply filtering problem can cause humming conditions too and can not be fixed by an isolation transformer. If you have a portable scanner, run it on batteries for a test to see if the buzzing goes away.

Also if you have a multimeter, check between the primary and secondary side don't have any resistance due to a short or miswire.

{edit} Also it's possible you are overdriving the sound input on your device. turn down the scanner audio level to see if the buzzing goes away.
https://www.broadcastify.com/listen/feed/28617


Humming went down when on batteries, I need to get a better power supply I guess?

Last edited by Dark_Hunter; 08-22-2018 at 3:19 PM.. Reason: Added Text
Reply With Quote
  #16 (permalink)  
Old 08-22-2018, 3:24 PM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Ok humming and buzzing still there after running on batteries.

Sent from my SM-N950F using Tapatalk
Reply With Quote
  #17 (permalink)  
Old 08-22-2018, 6:52 PM
ProScan's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Jul 2006
Location: Ontario, Calif.
Posts: 2,836
Default

Quote:
Originally Posted by Dark_Hunter View Post
Ok humming and buzzing still there after running on batteries.

Sent from my SM-N950F using Tapatalk
OK, If the AC cable is disconnected from the scanner then you can eliminate a ground loop and power supply filtering problem. The only thing left is the audio cable. Make sure it's shielded and not running parallel to any AC wires.

{edit} I meant the scanner power supply. It still could be the raspberry pi power supply causing the hum
__________________
Most Popular & Feature-Rich Scanner Software For The Uniden's
ProScan - RadioFeed Home Page
bob@proscan.org

Last edited by ProScan; 08-22-2018 at 6:57 PM..
Reply With Quote
  #18 (permalink)  
Old 08-22-2018, 8:38 PM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Quote:
Originally Posted by ProScan View Post
OK, If the AC cable is disconnected from the scanner then you can eliminate a ground loop and power supply filtering problem. The only thing left is the audio cable. Make sure it's shielded and not running parallel to any AC wires.

{edit} I meant the scanner power supply. It still could be the raspberry pi power supply causing the hum
Ok so the Raspberry Pi AC adapter is the official one from them, how would I isolate that?

What kinda of shielding can I get? Does it come in tape form?

Sent from my SM-N950F using Tapatalk
Reply With Quote
  #19 (permalink)  
Old 08-25-2018, 6:49 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Quote:
Originally Posted by ProScan View Post
OK, If the AC cable is disconnected from the scanner then you can eliminate a ground loop and power supply filtering problem. The only thing left is the audio cable. Make sure it's shielded and not running parallel to any AC wires.

{edit} I meant the scanner power supply. It still could be the raspberry pi power supply causing the hum
For some reason the audio is excellent when I use the USB sound card and scanner plugged into my computer, there is a bit of hum and buzzing but not much. But when it's on the Pi its another story, what could be the issue?
Reply With Quote
  #20 (permalink)  
Old 09-01-2018, 12:40 AM
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jun 2018
Location: Auckland, New Zealand
Posts: 47
Default

Quote:
Originally Posted by ProScan View Post
OK, If the AC cable is disconnected from the scanner then you can eliminate a ground loop and power supply filtering problem. The only thing left is the audio cable. Make sure it's shielded and not running parallel to any AC wires.

{edit} I meant the scanner power supply. It still could be the raspberry pi power supply causing the hum
Turns out it is the power supply going into the scanner.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 2:30 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions