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This is the 3-Station/3-Channel FM Wireless Intercom, previously known as the Radioshack FM Wireless Intercom, 2-channel, and now known as Advanced 3-Station/3-Channel FM Wireless Intercom - what makes it "advanced" is not clear. RadioShack Model: 43-3105 | Catalog #: 43-3105 The unit replaces the model 43-219 and remains 100% compatible. There have been similar models prior to 43-219 that are older and also compatible. It is a type of [[FM Wireless Power Line Intercom]] that places RF modulation on the AC electrical system of the building. *Gray; Built-in Speaker, Microphone; 3 per pack *Attached 6.5', 3 Sprong AC Power Cord *Control Volume and Power; Lockable talk button to monitor another room with confidence; FM circuitry provides clear, reliable *reception and transmission; Call button signals other stations *3 Channels( A-200KHz, B-270KHz, C-230KHZ); Transmission Range - 300 feet [[File:radioshack43-3105_01.jpg]] == Review == Radio Shack no. 43-3105 wireless intercom works well if all units are connected to outlets that are on the same AC electrical phase. In some homes individuals report that they are clear and work well. In other homes owners report static and interference. The manufacturer warns that the intercom system might cause TV or radio interference even when it operating properly. This is because the units work by intentionally putting noise in your home electrical system. At the frequency these operate, the noise generally goes unnoticed, however, it is still signal in the electrical system other than the 60Hz AC. == Electronic Info == The model uses three AC-Cap Suppresion,0.022uF 275V X2 Polypropylene Film Capacitors which are interference suppressors for across the line applications. The "bridge" between the AC current and the onboard circuitry begins with these three capacitors. The board itself operates on 10.6V DC. The RF modulation is injected in the power cord from two poles into Black and Green on one and white (common) on the other. The hot and ground are bridged opposite two separate capacitors (2 of the 3 Suppression AC-Caps.) {{:Template:Sparse Entry}} [[Category:Electronics]] [[Category:Intercom Systems]]

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