There’s this (although I don’t understand “beamforming” in this context”:

 

Multiple-Input Multiple-Output (MIMO) Capabilities with Beamforming The 
HomePlug AV2 specification also incorporates Multiple-Input Multiple-Output 
(MIMO) capabilities with beamforming, which offers the benefit of improved 
coverage throughout the home; particularly for previously hard to reach 
outlets. MIMO enables HomePlug AV2 devices to transmit on any two wire pairs 
within three-wire configurations. Whereas HomePlug AV always transmits on the 
Line-Neutral pair, HomePlug AV2 can transmit on any two pairs formed by the 
Line, Neutral or Ground wires (i.e., Line-Neutral, Line-Ground or Neutral 
Ground). This allows for significantly improved peak data rates and 
performance. MIMO uses two independent transmitters and up to four receivers, 
with beamforming required to maximize the performance on the independent 
streams. Some regions and some homes do not have the third wire required to 
implement MIMO however HomePlug AV2 automatically switches to standard SISO 
operation whenever the third wire is not available.

 

From:  
https://content.codico.com/fileadmin/media/download/datasheets/powerline-communication/homeplug-av-av2/homeplug-av2-whitepaper.pdf

 

From: AF <[email protected]> On Behalf Of [email protected]
Sent: Friday, November 21, 2025 2:44 PM
To: 'AnimalFarm Microwave Users Group' <[email protected]>
Subject: Re: [AFMUG] FTTH and outbuildings

 

Good point.  It was probably 20 years ago when doing the experiments.  I was 
thinking I had to install a capacitor across the legs of a box to get the 
signal to cross over but it turned out that the hot wire was not needed for the 
signal.

 

 

From: AF <[email protected] <mailto:[email protected]> > On Behalf 
Of Bill Prince
Sent: Friday, November 21, 2025 1:37 PM
To: [email protected] <mailto:[email protected]> 
Subject: Re: [AFMUG] FTTH and outbuildings

 

That's a neat trick. Signalling without power.

bp
<part15sbs{at}gmail{dot}com>

On 11/21/2025 12:33 PM, [email protected] <mailto:[email protected]>  wrote:

No idea.  I do know they can signal through a circuit with the breaker turned 
off.  

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