UPB filter parts LC values

I'm planning my UPB system and plan on using filters inside the extra deep boxes in several locations, such as my server room and AV room. The only device I see on the market is the ZNF10A-W. Its a single inductor and capacitor and costs about $20 for the pair. My problem is I will need at least 10 of these things, so I'd prefer to buy a boat load of similar discrete parts from DigiKey or Mouser. I'd like to find out what the part values are for these two parts.

It appears you only need one inductor in series on the hot leg and then the capacitor in shunt across the load side (between the hot and neutral). Is there any benefit to adding an inductor on the neutral side too? Obviously there would be additional filtering due to twice the inductance (and extra voltage drop), but are there any sneak path scenarios where using one on each leg is beneficial?

So does anyone know the UPB filter L & C values or know of a source for a much less expensive kit?

Thanks.

So I decided to buy one of the ZNF10A-W filters and examine it. Here is what I found for those who may be interested.

UPB is a pulse position modulation scheme. In the frequency domain this becomes similar to a frequency spread modulation from 4kHz to 40kHz. So for filtering and providing a relatively high impedance to prevent loading/shunting this is the frequency range to consider.

The Simply Automated ZNF10A-W filter product
The capacitor is rated for 180VAC, with a capacitance of 15uF and is designed for AC motor starting applications. I found it stocked at Digikey as a Panasonic JS181156-AA for $5.58 each.

The inductor is rated for 10Amps, has a DCR of about 10milliohms, and an inductance of about 220uH at a measurement frequency of 10kHz. My Hewlett Packard LCR meter only goes down to 10kHz. I searched all over the internet and could not find this exact inductor anywhere, so it might be custom. Not sure.

Recommendations
The shunt capacitor seems fine to me. But the 220uH inductor only provides about 5 ohms of series impedance at 4kHz. This does not seem like much of a shunt load isolation improvement. I figure you need at least 1millihenry (1millihenry=1mH=1000uH) to do much good.

After some searching I found what seems like a great part, if you feel like spending some money. The Hammond Manufacturing 195C20 is 1mH, 11mohms, and rated for 20Amps. Just what I need for my server room (UPS!) or any high reliability application looking for high current and high performance. The part has tabs for soldering or using a screw/nut to clamp down on a hooked wire. It's carried by DigiKey ($45.71) and Mouser ($49). But they don't stock it, they special order it per your web order. Size is a bit large; about 3"x3"x2.5" and weighs about 3lbs.

A lower current alternative is the Schaffner RB6122-16-1M0. This 1mH, 4.8mohms, 16Amp inductor is great for most applications. Its much smaller. But its designed for surface mounting applications so you will need to solder wires to it. Its carried and stocked by DigiKey ($11.28) and Mouser ($10). A great part for 90% of the applications out there.

My applications
My server room will have an UPS and several other switching power supplies. A very noisy environment for UPB. I'm going with the 195C20 series inductor and the JS181156-AA shunt capacitor mounted in it's own single gang box at the point of entry into the server room. From there it will branch out to several duplex receptacles to connect to my equipment. The UPB PIM will be connected before this filter.

The AV/TV room will use the same parts.

The master bedroom AV equipment is much less of a load. For this area I'll use the Schaffner RB6122-16-1M0 and the Panasonic JS181156-AA.

And there you have it. I know this is probably considered overkill by many people, but I'm looking for NO PROBLEMS and high WAF. If necessary I can repeat this filter arrangement where ever else it may be needed as noise sources may be found.

This is way over my head, but I'm very interested in the results. I'd love to see pictures and if at all humanly possible, readings on noise/communication before and after you install it.

The market is sorely lacking in good filters for high amperage circuits.

I'd also love to see a way to clean the powerline as a whole before it enters the house. I thought X10 had some, but I haven't looked in a long time.

If your looking for high amperage filtering then Hammond Manufacturing is your source for powerline inductors. They make some really big stuff. Digikey & Mouser seem to carry most of it.

For example a 100Amp 1mH inductor costs about $300 and you would need two or three of them (one in series on each line and possibly one on the neutral). Ain't cheap (or small).

http://www.hammondmfg.com/195.htm

I don't really expect any "results". I'm going to implement this if I have comms problems or not. Like I said, I want no problems so I'm taking preemptive steps to avoid them. It might be overkill, but so be it.

Mr Spock said:

The UPB PIM will be connected before this filter.

Click to expand...

So the filter will be between the PIM and the receiving devices? I assume at point of use.

http://www.ebay.com/itm/2pcs-Common-Mode-line-filter-25mmx15mmx13mm-Inductor-1mH-16A-/160860952540?pt=LH_DefaultDomain_0&hash=item25740f57dc

Why not just buy of the existing filters on the market?

az1324 said:

http://www.ebay.com/...=item25740f57dc

Click to expand...

This is a common mode inductor. I think you can use this part, but should only use one side of it, leaving the other side unconnected and insulated (no bare ends). You will need to solder wires to it and put it in a box. Very nice price! It no longer seems available, but there are others on eBay.

Frederick C. Wilt said:

Why not just buy of the existing filters on the market?

Click to expand...

The existing filter on the market (ZNF10A-W) uses an inductor that is only rated at 10A and the inductance value (~0.22mH) seems too low to me. For most applications a 10A rating would be sufficient, but for my server room it is not.

Mr Spock said:

The existing filter on the market (ZNF10A-W) uses an inductor that is only rated at 10A and the inductance value (~0.22mH) seems too low to me. For most applications a 10A rating would be sufficient, but for my server room it is not.

Click to expand...

When I went looking I found 4 or 5 filters - off the top of my head I don't remember the numbers. I know that one of them was rated at 20A as I used them in my server room. Now I included X10 filters in my search because I read in more then one location that they would work for UPB. Now I didn't open the case and look at the parts but I know they did they job and that's all I cared about.