Eclipse CD8445E Owner's Manual download pdf (Page 113)

113

How to operate the tuner

VIII

FM reception characteristics

In general, FM has much better tonal quality than AM. However, FM and FM

stereo reception encounter several characteristic problems not encountered

with AM. FM is more difficult to receive than AM in a moving vehicle. The

following are explanatory notes on what to expect from FM reception and on

how to get satisfactory performance.

FM reception differs from AM

A characteristic of transmitted signals is that lower frequencies

travel further. FM frequencies are much higher than AM's (similar to

a ray of light): they won’t bend but they will reflect. Often, they will

be interrupted by tall buildings, mountains, etc., taking direct and

indirect paths to your vehicle’s antenna. The distance at which FM

stations can be received satisfactorily is usually not nearly as far as

that which AM stations can be received.

Fading out

In weak signal or "fringe" reception areas, FM stations may fade out

completely, or fade in and out. When driving in weak signal areas,

such as near hills, through valleys or tunnels, among tall buildings,

etc., you may encounter unusual noise interference. THIS IS NOT A

TUNER PROBLEM. In this case, you can only wait until you are in a

better reception area, tune to a stronger station, or reduce the treble

level.

Ionosphere Ionosphere

AM Radio Waves FM Radio Waves

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Eclipse CD8445E Owner's Manual Page 113