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Joined: Jul 2010
Posts: 185
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Joined: Jul 2010
Posts: 185 |
What have you done to stop AM radio noise? im curious. ive tried chokes, mike sandman stuff, even putting in an earth ground.
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Joined: Jun 2006
Posts: 8,735 Likes: 12
Moderator-Nortel, Computers, General
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Moderator-Nortel, Computers, General
Joined: Jun 2006
Posts: 8,735 Likes: 12 |
Best results I've had was getting the telco to switch pairs, because the pair your line is on is "out of balance". Be forewarned that you'll most likely get the "Deer-eyes Look" if he's not an old-timer....
Scientists say that the universe is made up of Protons, Neutron & Electrons. They forgot "Morons".
Dave. (CTUB) Canadian Techs Use Bix!
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Joined: Sep 2006
Posts: 3,290
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Joined: Sep 2006
Posts: 3,290 |
Have you tested the line at the NID to determine which way the interference is coming from? Is the interference coming from the telco side or the subscriber side? Have you checked the line for metallic faults? Can you tell us what types of telephones are receiving the unwanted AM transmission? Generally, an unbalanced line will not be the source of this problem. It is generally caused by the receiver or (more often) the carbon transmitter acting as an RF detector. The BSP solution for conventional (500 series) telephones is to place a 0.02mFd capacitor at one of various places on the network. Try between one of the receiver wires or one of the transmitter wires and either side of the incoming T&R. Or try other combinations of terminals on the network. There is also an RF reducing induction coil that resembles a 44A block. I believe that they are MD by AT&T, but Suttle might still make them. The WE model part number was 1542A. Google for "Suttle 1542A" and you will find several results. https://www.telephonywarehouse.com/Suttle-1542AM-48-p/1542am-48-tw.htm
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: Jul 2010
Posts: 185
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Joined: Jul 2010
Posts: 185 |
They are telematrix phones.
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Joined: Sep 2006
Posts: 3,290
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Member
Joined: Sep 2006
Posts: 3,290 |
Here is the BSP that describes the problem and the process: 500-150-100
Do a Google search for "500-150-100 BSP" and you will get results.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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