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Joined: Nov 2010
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TheNunz Offline OP
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I think you are correct in that it is probably just an old protector. I have a side view and can see one of the terminals.

I could bypass it by disconnecting that line and running a new line to the kitchen. My current problem is that when I disconnect that line, I'm back to the hum caused by mj on the rest of the house (garage and alarm).

Regardless of whether the 2-line is connected or not, I am getting a hum on the kitchen phone. Connecting the 2-line phone with or without mj makes no difference.

Is it possible that the protector and mj are both causing interference that are canceling each other out on all phones except the kitchen (closet phone to the protector)?

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I doubt very much if one trouble would cancel another.

Your two line phone. Does it have a line 1/2 line 1 line 2 or is it line 1/2 line 2? Two jacks vs 3. If it just has two I'm sure one of the jacks will be for two lines ie 1/2. If so make sure your base cord is NOT a 4 wire cord as that could be a source of trouble, same with the cord to the MJ. Just the center pins should have wires.

If you have access to a volt ohm meter you might want to disconnect at the NID and make sure your house wiring is clean also.


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TheNunz Offline OP
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The 2-line phone has 2 jacks; 1/2 and 2. I verified that I am using 2 wire base cords for both.

To check using an ohm meter, should I short the disconnected wires and check the resistance at each phone jack? If so, do I need to take the protector into account when I check the kitchen line? What would be the maximum resistance expected?

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Just look for any faults. Check tip to ring, tip to ground and ring to ground. Don't worry about the resistance of the loop as you're looking for something that causes a hum.

Another thing is go to the NID and plug in a plain ol' phone and make a call, see if you hear the hum from there.

I'm assuming this is just a low frequency low level steady hum. Correct?


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TheNunz Offline OP
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Yes, it is a low frequency low level steady hum.

So its a new day and no rain. Back to original situation, when mj is plugged in thers is hum on verizon line. When mj is not connected, everything works fine. I'm really confused about yesterday and why things kinda flip-flopped and there was always a hum on the kitchen phone. My wife is convinced it has to do with the rain. I don't think so. I did check a few things today.

Plugging a phone directly into the NID provides a good dial tone with 51.8vdc across the Ring and Tip. This NID (and I assume most of them), disconnects the house feed when you plug a phone into the NID.

I disconnected the junction box that connects the alarm to the office and kitchen lines. I verified that I have a good dial tone with 51.8vdc across the Ring and Tip from the alarm. I also measured Ring to ground at -51.4vdc and Tip to ground at 0 (I was on the 200v scale).

The kitchen line R->T was 1mv with the cordless phone connected and 0mv without.

The office line R-T was 2.9mv with the 2-line phone and mj connected, 2.7mv with mj disconnected, and 0mv with the 2-line phone disconnected.

I connected the alarm, kitchen and office back together and have an SLT plugged into mj. Next chance I get, I will buy a new 2-line phone.

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Tip should have no voltage. I've never used the DCA setting for shooting trouble so have no idea what your mv readings mean.

Just look for resistance to ground and across the pair, with the feed removed. There should be no resistance and no voltage.

I can see no reason for your MJ to cause a hum on your 1st line if you're only using single pair base cords to your 2 line phone. If the MJ were inducing noise than it should do the same with a SLT plugged into it.

I don't use MJ, but I know several board member do. I do have a NetTalk DUO into a system with no problems. So maybe our MJ users can let us know if they've ever had a hum on their MJ's.


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Quote
Originally posted by JPGolan:
Any chance your new Verizon line has DSL service on it?. The "data hum" could be inducted across the pairs of line 1 and line 2, you would need a DSL filter on both if that is the case.
Even if you don't have DSL or you already are filtered, if the MJ really is inducing noise a DSL filter between it and the phone may cure it. Can't hurt to try.


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My old boss used to say" go ahead and try it, you might accidently fix it"

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TheNunz Offline OP
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So I finally got around to buying another 2-line phone. It is the same exact model as the original phone. I hooked it up and it too has the same hum. So I have ruled out the phone being defective. I will buy a different phone and see how it goes.

I did notice an option the phone has.... "Set Line Mode". The manual only states "Do not change this setting unless instructed to by customer service." The option settings are Type-A, Type-B, Type-C, OFF.

Any thoughts on what Line Mode is and if that is something worth trying?

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I'm guessing 1 or more settings are for low voltage. Some PBXs and some SIP to loop start converters only have 24-30 volts on hook. The Panasonic 4-line cordless system has provision, and I believe some of the AT&T multiline sets have the same capability, as well.


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