Ameco R-5 Manual do Proprietário - Página 5

Procurar online ou descarregar pdf Manual do Proprietário para Recetor Ameco R-5. Ameco R-5 17 páginas.

LISTENING TO THE FM BAND

Certain bands of the frequencies in the 30 – 50 MHz range are allocated by the U.S. Government to

what is known as the Public Service Channels. This includes police, fire departments, forestry and

conservation, and special emergency service. Frequency modulation is used by these services because

of its ability to overcome much of the effect of ignition noises.

In order to enter this exciting world of emergency communications, it will be necessary to use more

rigorous standards in the selection of an antenna. It is recommended that the beginner refer to some

standard book on the subject, such as the ARRL Antenna Handbook by the AMERICAN RADIO

RELAY LEAGUE.

AVERAGE GAIN MEASUREMENTS AT 455 kHz

Figure 1: Printed Circuit Board Outline