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Author Topic: DIY filter for REIN and RF noise  (Read 1766 times)

neil

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DIY filter for REIN and RF noise
« on: August 07, 2020, 07:46:37 PM »

Can someone please help me build filter for REIN and RF noise?
or identify components used here for REIN and RF filtering in this vdsl faceplate?
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neil

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Re: DIY filter for REIN and RF noise
« Reply #1 on: August 07, 2020, 07:47:23 PM »

if possible pleas post link from ali epxress of the components
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neil

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Re: DIY filter for REIN and RF noise
« Reply #2 on: August 07, 2020, 08:31:44 PM »

ferrite core or toroidal ring is used for RF filtering?
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Alex Atkin UK

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Re: DIY filter for REIN and RF noise
« Reply #3 on: August 07, 2020, 10:03:36 PM »

Wouldn't filtering one end of the line create an imbalance?  The interference will still exist but your end might not see it, while its still corrupting the DSL signal at the other end?
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neil

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Re: DIY filter for REIN and RF noise
« Reply #4 on: August 07, 2020, 11:44:39 PM »

Wouldn't filtering one end of the line create an imbalance?  The interference will still exist but your end might not see it, while its still corrupting the DSL signal at the other end?
hmm i dont know thats why i am asking here
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Alex Atkin UK

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Re: DIY filter for REIN and RF noise
« Reply #5 on: August 08, 2020, 03:11:20 AM »

hmm i dont know thats why i am asking here

Fair enough.  But several regulars (I believe even the site owner) suffers REIN, so if it was THAT easy, someone would have done it.  ;)
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mrk26

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Re: DIY filter for REIN and RF noise
« Reply #6 on: August 09, 2020, 11:31:46 AM »

Can someone please help me build filter for REIN and RF noise?
or identify components used here for REIN and RF filtering in this vdsl faceplate?
Did you tried this https://www.bcedirect.co.uk/products/broadband-stabiliser-and-line-conditioner-faster-more-reliable-broadband-increase-broadband-speed-lower-broadband-dropouts looks like it's something you try to build?
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Alex Atkin UK

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Re: DIY filter for REIN and RF noise
« Reply #7 on: August 09, 2020, 10:01:47 PM »

Did you tried this https://www.bcedirect.co.uk/products/broadband-stabiliser-and-line-conditioner-faster-more-reliable-broadband-increase-broadband-speed-lower-broadband-dropouts looks like it's something you try to build?

Seems to be a capacitor and an inductor.  Despite what they say I'm pretty sure there is nothing here that isn't already in a good line filter, its just the filter has additional electronics to isolate the voice frequencies too.
« Last Edit: August 09, 2020, 10:04:57 PM by Alex Atkin UK »
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neil

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Re: DIY filter for REIN and RF noise
« Reply #8 on: November 25, 2020, 09:16:17 PM »

according to this video
https://youtu.be/jD67a-ZC7VY?t=450

@ 7:30

presumably this toroid core is the rein filter
now only if we knew the specs  ???

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neil

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Re: DIY filter for REIN and RF noise
« Reply #9 on: November 25, 2020, 10:13:32 PM »

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Weaver

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Re: DIY filter for REIN and RF noise
« Reply #10 on: November 26, 2020, 05:58:29 AM »

Good micro filters / SSFPs have complex electronics to handle the on/off hook condition too.
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burakkucat

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Re: DIY filter for REIN and RF noise
« Reply #11 on: November 26, 2020, 04:51:16 PM »

presumably this toroid core is the rein filter

It is a common-mode filter.

An xDSL service exists between two analogue transceiver units, the xTU-C and the xTU-R, connected together by a radio frequency transmission line consisting of a pair of twisted wires carried within one or more sequentially connected cables. The analogue transceivers operate in differential mode. Think of one moment in time (if you like, consider the circuit "to be frozen" in time) and we look at the state of the circuit. The circuit consists of two wires, one twisted pair (with wires labelled A & B), and at that "frozen" moment in time let's say that the the electrons in the wire labelled A are "pushing" from the xTU-C to the xTU-R whilst the electrons in the wire labelled B are "pushing" from the xTU-C to the xTU-R. That is differential mode operation. Now consider the cable carrying the twisted pair of wires linking the xTU-C to the xTU-R. In a real world situation that cable has significant length and can pass through regions where there are (legitimate) high strength RF signals, pulsed electromagnetic-fields, switched high-current inductive loads (to name three possible sources of interference to the xDSL service.) As the xDSL service is carried over a twisted pair, whatever interference that is coupled into the A-wire of the pair is also coupled into the B-wire of the pair. The interference, therefore, appears in common-mode on the pair. Hence the usage of that common-mode filter. It rejects any common-mode signal on the pair whilst allowing the differential-mode signal on the pair to pass unhindered.
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burakkucat

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Re: DIY filter for REIN and RF noise
« Reply #12 on: November 26, 2020, 04:53:19 PM »

https://www.youtube.com/watch?v=J6ZKPT67JA0

where is the full video  :no:

Openreach have removed numerous videos from its YouTube channel and, I presume, that video was one so removed.  :(
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neil

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Re: DIY filter for REIN and RF noise
« Reply #13 on: November 26, 2020, 07:49:24 PM »

It is a common-mode filter.

An xDSL service exists between two analogue transceiver units, the xTU-C and the xTU-R, connected together by a radio frequency transmission line consisting of a pair of twisted wires carried within one or more sequentially connected cables. The analogue transceivers operate in differential mode. Think of one moment in time (if you like, consider the circuit "to be frozen" in time) and we look at the state of the circuit. The circuit consists of two wires, one twisted pair (with wires labelled A & B), and at that "frozen" moment in time let's say that the the electrons in the wire labelled A are "pushing" from the xTU-C to the xTU-R whilst the electrons in the wire labelled B are "pushing" from the xTU-C to the xTU-R. That is differential mode operation. Now consider the cable carrying the twisted pair of wires linking the xTU-C to the xTU-R. In a real world situation that cable has significant length and can pass through regions where there are (legitimate) high strength RF signals, pulsed electromagnetic-fields, switched high-current inductive loads (to name three possible sources of interference to the xDSL service.) As the xDSL service is carried over a twisted pair, whatever interference that is coupled into the A-wire of the pair is also coupled into the B-wire of the pair. The interference, therefore, appears in common-mode on the pair. Hence the usage of that common-mode filter. It rejects any common-mode signal on the pair whilst allowing the differential-mode signal on the pair to pass unhindered.

and how's the graph or plot looks like with and without this common mode filter?
noise level etc
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4candles

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Re: DIY filter for REIN and RF noise
« Reply #14 on: November 26, 2020, 08:03:02 PM »

An excellent exposition from burakkucat.   :graduate:
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