high frequency intermittent noise

It's 15.

@james1969

99% chance the wire is #14awg. It is rated for 15 amps.
Just a guess the circuit is a convenience outlet branch circuit that feeds several other wall outlets in the room. Maybe even some ceiling lights. Have you ever checked what all is connected to the same circuit when you shut off the breaker to change out the outlet?

When you changed out the outlet for your audio system was there only the two wires inside the box that connected directly to the duplex receptacle?
Do you remember what the 2 wires looked like? was the insulation on the wires made of PVC/plastic one black, maybe red, and the other white? Do you remember how the plastic insulation looked? Was the white wire discolored kind of yellowish at the end that terminated, connected, to the receptacle. Was the insulation of either wire discolored, possibly caused by heat over the years.? Did the insulation look or seem to be hard or brittle?

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Or did the 2 wires appear to have a cloth covering over what appeared to be rubber? One wire was black and the other was white or appeared to be white? What condition would you say the insulation was in?

I realize I am off subject with this post. I just finally got around to looking at your system on your system page. That’s a really nice system to be fed from a 15 amp convenience outlet circuit.

Jim

@jea48

Yes, this is a dedicated circuit, I have tested for this.

When I changed out the outlet, there were 2 wires connected to the old receptacle: white and red. There is another black wire not being used. I didn’t want to touch that wire, since I don’t really know what I am doing, I just copied the previous installation, using only the red and white wires previously used. The insulation seems to be fair, it’s PVC/plastic and the white looks white and did not appear brittle.

I would say the insulation is in good condition.

I will have someone come in and take a look at the circuit, maybe it can be switched out for a 20 amp circuit. So far though, I’ve never tripped the circuit breaker, and my amps are class A.  Thank you for the kind words.

LTE is an evolution of GSM. It uses a combination of TDMA and FDMA. The various high speed pulses are the individual data packets broadcast in the data windows. Their intensity is the product of the frequency their transmitted on and how well tuned the antenna is to them. 
To be honest I'm surprised an antenna across a street can do this. Another possibility is that somebody very near by has a picocell or a femtocell installation in their unit. That's common in larger cities. I wouldn't be surprised if unshielded tubes picked this up. Something somewhere needs more shielding and I'd be focusing on that as much as possible. I'd be tempted to build a Faraday cage and put gear inside it to see what happens. 

Thanks kosst_amojan for the info.

@james1969
Got any of these things around or one of your close neighbors?
http://hetnet.com/what-are-small-cells-a-basic-guide-to-femtocells-picocells-and-microcells/