Dark_Hunter
Member
My feed is setting a lot of buzzing and humming while Rxing, are you able to assist me?
Interference
- Thread starter Dark_Hunter
- Start date
- Status
Dark_Hunter
Member
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?
Dark_Hunter
Member
Dark_Hunter
Member
Does it matter what direction it goes in?
Sent from my SM-N950F using Tapatalk
Sent from my SM-N950F using Tapatalk
Dark_Hunter
Member
This what I'm using.
https://www.jaycar.co.nz/ground-loop-noise-isolator-stereo-3-5mm/p/AA3086
Sent from my SM-N950F using Tapatalk
Dark_Hunter
Member
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
Sent from my SM-N950F using Tapatalk
RFI-EMI-GUY
Member
- Joined
- Dec 22, 2013
- Messages
- 6,868
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.
Dark_Hunter
Member
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.
Last edited:
Dark_Hunter
Member
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:
Dark_Hunter
Member
Ok humming and buzzing still there after running on batteries.
Sent from my SM-N950F using Tapatalk
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
Last edited:
Dark_Hunter
Member
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
Dark_Hunter
Member
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?
Dark_Hunter
Member
Turns out it is the power supply going into the scanner.
- Status
Similar threads
