The main problem affecting telephones is audio rectification. Do you sometimes feel like you’re not alone on your telephone line? Do you hear unwanted voices or sounds?
This disruption can affect the telephone or various other electronic instruments in the home. Sometimes, when a piece of equipment is surrounded by an intense radio signal, it can act as a radio receiver. This phenomenon, known as audio rectification, is caused by the telephone, and such equipment must be modified or repaired.
If your telephone is picking up radio signals, check to see if there is a broadcast or two-way radio station transmitter antenna in the area. Inform the station operator about the problem. He/she will likely cooperate to help you eliminate the interference.
NOTE: A more expensive telephone is not necessarily anymore effective. A telephone with several options, such ashands-free mode, memory, call display and a built-inanswering machine, has many electronic componentsthat can make it more susceptible to interference. If the telephone setis rented, the telephone company should help you to eliminate theinterference.
This procedure can help you find the potential source of interference.
A. Disconnect all telephone equipment or all accessories connected to the telephone, such as answering machines, modems or fax machines. Proceeding by elimination, reconnect one telephone or accessory at a time and check whether the interference is still present. If you have only one telephone, borrow another one. Telephone companies also have telephone sets that are protected from radio frequency interference. If the interference persists on this type of equipment, the line is likely the cause. The telephone company should then be notified. Go to step D. If, however, the interference affects only one set, that set is the problem. Go to step B.
B. The interference may affect components in the telephone, primarily the telephone cord, the handset cord, or the telephone case.
You can also try a telephone set with better protection against interference. However, the interference may also be produced by telephone accessories. So before rushing out to buy these filters, go to step C.
NOTE: If filters remain the only solution, it may beless expensive to replace the set than to add filters.Consult a technician or a supplier.
C. If the interference is coming from a telephone accessory, the process of elimination must again be used. The cords and connections on various accessories may be faulty. If the problem persists after all these checks, go to step D.
D. There is a good chance the problem is in the telephone line outside your home. Find out if your neighbours are experiencing the same problem. If so, consult with your telephone company which may install filters or shielding as the ultimate solution.
Cordless telephones, which continue to grow in popularity, are actually radio transmitters/receivers that are subject to interference. In addition to picking up unwanted radio signals, the cordless telephone may also pick up transmissions from other cordless telephones, baby monitors or portable intercoms using the same frequency.
For more information on filters, read the article Various solutions to interference.
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