A Transciever is a very sensitive piece of equipment, able to pick up small noise signals and amplify them - particularly if the source of the signal is within a few feet of the transciever.

Any noise heard on your transciever almost certainly originates from outside the radio itself, common belief that the FM Mode creates much of the noise heard is false and misleading.

There are some simple, quick remedies for many of the most common problems with regard to the eradication of noise from your transciever reception, which will provide a much more pleasant means of operation.

A very common source of noise when a transciever is used for MOBILE Operation is: The IGNITION SYSTEM - check this by ensuring that the Transciever is connected to the Accessory portion of the Main power system, such as the Cigarette lighter, switch the Ingnition to the ACC position, if the noise disappears then you do have an Ignition noise problem.

The Interference is normally divided in to 2 categories, more commonly both are at fault, (vehicles are not normally designed with transcievers in mind,)

• Alternator-Brush Sparking : - This causes a "Whine" which alters with engine speed,
  • What You Do! Take off the Alternator (seek help if this is NOT your field!!)
  • CAUSE Dirty commutator
  • CURE Clean with fine-grade emery cloth and clean the commutator grooves with a small tool (screwdriver?)
• Voltage Regulators - this will cause an excessive "HASHY" sound and may drown out weak to medium strength signals.
  • What You Do! Fit suppressors to main systems
  • CAUSE The relay contacts "JITTER" open and Closed when the Battery is charged.
  • CURE Fit coaxial feed-through capacitor at the Battery (Positive terminal) to the Chassis (Ground), also at the Armature Terminals on the Regulator box.