Motorola GM1200E 설치 매뉴얼 - 페이지 36

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Motorola GM1200E에 대해서도 마찬가지입니다: 사용자 설명서 (22 페이지), 설치 매뉴얼 (8 페이지)

페이지 인쇄

Noise Reduction Techniques

5.10

Extender Radios

Impulse noise (principally ignition noise) is heard as annoying "pops" along with a received

message. Each noise impulse excites the highly selective receiver tuned circuits which "ring" after

the noise impulse disappears. This "ringing" effectively extends the duration of the noise impulse as

it passes through the receiver. Motorola radios with the "Extender" feature have additional circuitry

which "blanks" the receiver for the duration of the undesired noise pulse so that annoying "pops" are

not heard. The "Extender" receiver effectively chops out the small portion of the message which

contains "pops". This type of receiver is effective in areas where other noisy vehicle ignition systems

interfere with received messages. However, even "Extender" receivers cannot cope with extremely

noisy environments because too much chopping can also destroy message intelligibility.

2-12

Reducing Noise Interference in Mobile Two-Way Radio Installations