Amateur Radio Shortwave Bands (M=Meters) - Eton E5 Mode D'emploi

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Table des Matières

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INTRODUCTION TO SHORTWAVE

GETTING CLOSE TO A WINDOW

Getting close to a window may substantially improve reception.

Shortwave signals penetrate single-level wood frame buildings easiest,

while concrete and brick buildings, multi-story and metal roofed struc-

tures often block signals. In such situations, position the radio as close

to a window as possible. Holding it may also help. Use an external

antenna if necessary.

SHORTWAVE ANTENNAS

An external shortwave antenna, especially when mounted outside,

can greatly enhance shortwave reception. Some radios are equipped

with special antenna sockets. Eton Corporation does not manufacture

or sell shortwave antennas, however, there are many excellent models

available. A web search such as 'shortwave antennas' will result in

many sources for such products.

INTRODUCTION TO SINGLE SIDEBAND (SSB)

Many higher-end shortwave radios have special circuitry enabling

SSB, a highly efficient way of electronically processing transmitted

and received signals for two-way communication. Examples of this

are amateur radio (hams), maritime and aeronautical communication.

Either upper side band (USB) or lower side band (LSB) can be used.

Non-voice methods of communication can also be heard, including

CW (Morse code) and RTTY (radio teletype).

Receiving SSB signals is not always easy. Since this is two-way

communications, transmissions are often very short and sporadic.

Also, most two-way communication uses relatively low power, 50 to

continued

INTRODUCTION TO SHORTWAVE

1000 watts. The amateur radio operators are easiest to find, Best

results are experienced when using an outdoor shortwave antenna

such as a dipole.

Follow your radio's instructions on how to engage its SSB feature.

Shown next are some selected frequency ranges on which SSB com-

munications can be found. All frequencies are shown in kilohertz.