No difference if you engage the ground lift I assume?
Exactly, totally no difference
And this is with a short 1/4" cable going to XLR?
Actually no, my XLR cable which comes out from the DI BOX and goes into my audio interface is about 185cm(72,83 inches) long… You think I could try to use a shorter cable? In your opinion, what would be a length that could allow me to eliminate the interference and play comfortably? (I record in a small bedroom)
I think I could make a report to the municipal office of my city, although I don’t think they would pay much attention to the whole situation…
Hi there,
since I’m probably going to live with the problem, may I ask you some more advice about how to handle it after the recording?
Reading this answer of yours I understood I’ll have to use an EQ plugin and apply a “band-stop” filter to the frequencies where we located the beep (about 5300/5400Hz looking at the analytics) and simply drop down (i.e. 20dB down) the sound inside that frequencies band, narrowing the band as much as possible (high Q factor), is that right? Did I miss something?
Won’t this “frequencies removal” affect my sound? I mean, won’t I end up losing some characteristics and “colors” of my sound by removing some frequencies? Perhaps the loss would be so minimal that the listener wouldn’t perceive the change?
Hello, where I live, Madrid, right next door, there is a relatively large telephone link installation on the roof, although I cannot see the antennas directly, because they are covered by the structure of the building from mine, they are not more than 50 meters from my apartment, and we have never had interference of any kind, in addition there is another building opposite with another smaller telephone link installation 120 meters away, and it does not cause any problems either.
Apart from that I have 2 hospitals (which have their own communication systems) no more than 1km away, in addition to the antennas of 5 skyscrapers at 1200 meters, I also have a communication antenna of the city’s water company at 700 meters.
All the antennas mentioned include combined telephone and data systems, at different frequency bands and powers, and none of them generate interference problems.
I am not a telecommunications engineer so I cannot explain what specific systems all these antennas are using, but I do know that sometimes there can be problems due to poor adjustment or operation of the transmitting devices causing spurious signals at multiples (or the opposite) of the transmission frequency.
Also if the electrical installations of the building/house have any problem, they can receive radio signals through poorly installed or damaged cables.
It is perfectly possible that an antenna installation has problems like the one described at the beginning of this thread, but not It is common, you should ask the neighbors of the building or the street and ask in the building where the antenna is to find out which company manages that installation and contact them to explain the problem, in case there is something in the installation that does not work as it should.
Regards
Sorry just noticed I never replied to you, a few things:
XLR Cable length isn’t really an issue in general, it is the length of the 1/4" cable that can be an issue, as that is unbalanced coming out of your guitar.
You got the gist of it.
Yes it will, but by how much is debateable. One, if utilizing a notch filter or a parametric with a high Q, you will want to ensure it doesn’t add resonant frequencies to the mix, this is a difference you will get between different qualities of filters. Ideally you only notch when the beep is present, but depending on how strong a notch you need you may find it more desireable to keep it in so you don’t have changes in sound drawing attention to it.
End result though if done well I doubt it will be noticed.
It varies. But usually this is only an issue if other issues exist…
Any decently designed professional audio equipment this should not be an issue on. Sadly there is a fair amount with what is referred to as a ‘Pin 1 Problem’ referring to improper grounding of the shield conductor on input ports that can result in similar issues yes, but that is why the DI box and the ground lift above to test with.
It is potentially possible for it to be induced inside the audio interface, I have had some over the years with odd issues but in general they should be properly shielded for this purpose, but again see my point about pin-1 issues before.
Seablade
Hi seablade, I agree with what you say. In my youth as a live sound technician I had to deal with poorly shielded cables or connections in poor condition and in those cases noises would appear out of nowhere, even radio signals sometimes…
Nowadays, at least in my audio system (the typical “studio” at home), the problems usually come from cables or poorly made connections, but above all from the USB used in many modern sound devices, synths, midi controllers, external sound cards, etc.
The problem of high frequency noises due to USB is quite common but they are different noises than those described in this thread.
In my case I have 2 old synths, YAMAHA TG55 and KAWAI SPECTRA KC10, and a more modern one, the Waldorf Blofeld, all of them go through a Pyle PHE400 hum eliminator before entering the mixer, which has, apart from several analog outputs, a 2-channel connection of which I only use the output with pipewire (for general use of the PC audio), because if you use its input, the USB noise appears.
My system is a bit Frankenstein, but it doesn’t have noise (apart from the background noise of the equipment itself of course), the only thing that has always given me problems has been the existence of USB connections on different devices in my sound system.
greetings
Hi guys,
@dave_odl I’ll try to learn something more about the company managing the antenna, maybe contact them could help us to figure out the interference…
@seablade Thanks for the clarification, if everything else fails I’ll just fix it with a notch filter in post 
Thanks again guys, your help is so appreciated
That works better the more consistent the frequency of the interference remains. From the earlier sample provided it sounds like the interference is sliding between different frequencies, so you will just have to experiment so see how effective a notch filter will be in this case.
A general guideline is that the ear is more sensitive to a narrow boost than to a narrow cut, and the more narrow (in frequency) the cut, the less likely to be heard as objectionable.
Let your ear be your guide, but that is a good starting point.