Bedienungsanleitung Yaesu FT-897 (Seite 11 von 72) (Englisch)

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Page 9FT-897 OPERATING MANUAL

INSTALLATION

RF FIELD EXPOSURE

This transceiver is capable of power output in excess of 50

Watts, so customers in the United States may be required to

demonstrate compliance with Federal Communications

Commission (FCC) regulations concerning maximum per-

missible exposure to radio frequency energy. Compliance is

based on the actual power output used, feedline loss, an-

tenna type and height, and other factors which can only be

evaluated as a system.

Information regarding these regulations may be available

from your Dealer, your local radio club, from the FCC di-

rectly (press releases and other information can be found on

the FCC’s site on the World Wide Web at <http://

www.fcc.gov>), or from the American Radio Relay League,

Inc. (225 Main St., Newington CT 06111 or <http://

www.arrl.org>).

Although there is negligible radio frequency (RF) leakage

from the FT-897 transceiver itself, its antenna system should

be located as far away from humans and animals as practi-

cable, so as to avoid the possibility of shock due to acciden-

tal contact with the antenna or excessive long-term expo-

sure to RF energy. During mobile operation, do not transmit

if someone is standing adjacent to your antenna, and use the

lowest power possible.

Never stand in front of an antenna (during testing or opera-

tion) when RF power is applied, especially in the case of

430 MHz directional arrays. The 20 Watt power output sup-

plied by the FT-897, combined with the directivity of a beam

antenna, can cause immediate heating of human or animal

tissues, and may cause other undesirable medical effects.

ELECTROMAGNETIC COMPATIBILITY

If this transceiver is used with, or in the vicinity of, a com-

puter or computer-driven accessories, you may need to ex-

periment with grounding and/or Radio Frequency Interfer-

ence (RFI) suppression devices (such as ferrite cores) to

minimize interference to your communications caused by

energy from the computer. Computer-generated RFI is usu-

ally a result of inadequate shielding of the computer’s cabi-

net or I/O and peripheral connections. While computer equip-

ment may “comply” with RF emission standards, this does

not ensure that sensitive Amateur Radio receivers like the

FT-897 will not experience interference from the device!

Be certain to use only shielded cables for TNC-to-Trans-

ceiver connections. You may need to install AC line filters

on the power cord(s) of the suspected equipment, and

decoupling ferrite toroidal chokes may be required on inter-

connecting patch/data cables. As a last resort, you can try

installing additional shielding within the computer’s case,

using appropriate conductive mesh or conductive shielding

tape. Especially check “RF holes” where plastic is used for

cabinet front panels.

For further information, consult amateur radio reference

guides and publications relating to RFI suppression tech-

niques.

HEAT AND VENTILATION

To ensure long life of the components, be certain to provide

adequate ventilation around the cabinet of the FT-897. The

cooling system of the transceiver must be free to draw cool

air in from the side of the transceiver and expel warm air

from the rear of the transceiver.

Do not install the transceiver on top of another heat-gener-

ating device (such as a linear amplifier), and do not place

equipment, books, or papers on top of the transceiver. Place

the transceiver on a hard, flat, stable surface. Avoid heating

vents and window locations that could expose the transceiver

to excessive direct sunlight, especially in hot climates.

Heat Dust VentilationWater & Moisture

Note

Save the packing materials in case you need to trans-

port the set (on an airplane, etc.) and/or return the set

for service.

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