[RFI] Line noise vs Frequency
Stephanie WX3K
wx3k at ptd.net
Sun Aug 8 09:10:30 EDT 2021
Please share a clip of the audio. Would love to hear it
Stephanie WX3K
> On Aug 8, 2021, at 9:07 AM, Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:
>
> Hi Stephanie - I know that. I've been chasing line noise (and other noises) for 30 years or more, and have never encountered this inverse frequency dependence before, which is why I asked.
>
> I have both HF and VHF DF equipment. It's broadband noise so shows up on a spectrum display only as an elevated noise level, but the audio signature, especially on AM, is unmistakable.
>
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at <http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
>
>> On 8/8/2021 8:50 AM, Stephanie WX3K wrote:
>> Hard to really say what the exact root cause without further information
>>
>> The character of the noise will you what the source may be. Share an audio clip of it. Do you have a real time pandapter in your rig ? A picture would help to. Most likely need to share these using a cloud link from dropbox or something similar
>>
>> DFing aroung the area to track the exact physical would be needed here. The source could be a powerline issue(arcing insulator, resistive connection) but it could be a source conducted onto the line from possibly a switching power supply.
>>
>> Stephanie WX3K
>>
>>
>>>> On Aug 8, 2021, at 8:24 AM, Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:
>>>
>>> A (probably) dumb question: I have a severe line noise to my west. For some reason it is manageable on 20, much worse on 15 and crippling on 10. These subjective descriptions are confirmed on my S-meter. Why would this be happening, and does it offer any helpful clues to finding the source?
>>>
>>> --
>>> 73, Pete N4ZR
>>> Check out the new Reverse Beacon Network
>>> web server at <http://beta.reversebeacon.net>.
>>> For spots, please use your favorite
>>> "retail" DX cluster.
>>>
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