grounding the dongle?
- Thread starter KF5EGM
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Are you having issues you can specifically attribute to it being ungrounded?
Heres a good link to peruse, short thread tho.
Is it the same interference you had in the other thread?
interference or ?????
This is a screenshot of a video from your wav file:
What antenna are you using and where is it located?
If the antenna coax is grounded, then the dongle is also probably grounded.
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It looks like a lot to me. I can't tell his RF gain setting from his wav file.
I wonder how much noise he would hear on a battery operated portable radio tuned to the AM Broadcast band.
Video from KF5EGM's wav file
I use VLC Media Player
Download and play now:
2021-10-10 13-04-03KF5EGMradioRef.mp4
Download now, play later:
https://www.dropbox.com/s/ebiz8bcinnn36nx/2021-10-10 13-04-03KF5EGMradioRef.mp4?dl=1
TomLine
Member
If you pull the antenna wire from the reciever is the noise still there? What's your gain set at in the pop-up control panel. What's your antenna setup.
Thank you for the image.
That looks pretty bad.
What antenna are you using?
Where is the antenna located?
The source of RFI can be difficult to locate. Sometimes it is necessary to turn off all the power in your house to determine if the source is in your house or not.
Sorry, Colby; I wasn't sure.
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Sorry, my mistake. I'm obviously confused.
What antenna are you using and where is it located?
Using your phone with the dongle is a good idea if it means everything is battery powered.
Also, a laptop can operate on battery with the dongle to hunt for the source of interference. If you don't have one, maybe you can borrow one.
Is the coax for your antenna grounded to the house electrical system?
Interference can be conducted over the power lines or through the air, or both.
If you aren't able to listen to the broadcast band or listen to short wave, the interference must be pretty bad.
What dongle are you using, the RTL-SDR.COM V3 with a down converter for the AM Broadcast band and shortwave?
Can you receive the FM Band with the dongle and SDRSharp?
you have the rtl-sdr blog v3? have you tried it without the up-converter ,sampling mode Direct sampling (Q branch)?
With as much noise as is showing in that one image, how close are you to other residences? You could be getting noise from their wall warts, plasma displays, etc.
TomLine
Member
Did some antenna maintenace and afterwards had a ton of noise; noise floor looked like a roller coaster especiallly at meters. Checked everything, connectors, grounds for days without success.
Then it rained. The noise reduced significantly.
Then it rained. The noise reduced significantly.
Okay so update here, I CAN hear fm stations just fine when i remove the fm notch filter. I CAN hear some shortwave like RHC, Brother Stair, and a few others occasionally. Nothing interesting though, just the religious nuts mostly. The gain is up pretty high, that could be turned down. I live in a city with lots of old homes, wiring could be an issue. Wall warts are likely an issue from both my house and the neighbors. I've put chokes on a lot of my stuff and have more to add, I've been putting them on both ends of my cables. It's helped significantly but there is still a lot of noise. I also live very close to a LOT of broadcast towers. My location is honestly utter crap. That's why I just bought my first scanner, a radioshack Pro 433. I figure if I can't enjoy the lower bands then I can at least enjoy the upper ones.
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