MFJ MFJ-8100, Инструкция по эксплуатации, Страница: 14 / 27

MFJ-8100
World Band Receiver
14
SETTING UP A USEFUL SHORTWAVE ANTENNA
The reason why we provided a "universal binding post''
antenna connector (plus separate ground connector) is to make
it as easy and economical for you as possible to try out
different antenna setups. By "universal,'' we mean that you
can insert a "banana''-style plug OR make various styles of
connection with a simple bare wire.
Your receiver is so sensitive that even a few feet of wire
strung indoors will provide reception of stronger signals,
particularly at night. 20 to 30 feet of wire is much better.
Therefore, you can count on good reception even if you are
limited to keeping the antenna indoors as might be required
in apartment complexes, condos, etc.
Stringing all or part of your antenna outdoors is always
better. An ideal antenna for this receiver would consist of
25 to 100 feet of wire outdoors, as high as is safely
possible. Such antennas are called "random long wires'' and
also work fine in most attics. (Foil-backed insulation or
metal roofing will reduce the usefulness of an attic as
antenna space.)
Your antenna can be horizontal, vertical or a combination of
both. It can be tubing or pipe as well as wire. The wire can
be bare or insulated. It could be something not intended to
be an antenna such as a gutter, fence, flagpole or metal
roof. In fact, radio hams and serious SWL's have
experimented with thousands of imaginative antenna ideas.
VERY IMPORTANT: Use care and common sense when putting up
outdoor antennas. Be certain that your wires or your ladder
cannot come into contact with electrical power lines. You
can be KILLED by accidental contact with power lines.
YOUR RECEIVER'S AUDIO CIRCUIT: MANY WAYS TO LISTEN IN!
The LM386 audio amplifier IC circuit is designed to provide
ample volume to not one but TWO headphone jacks. We used
stereo jacks because today's economical personal music
headphones are as inexpensive as were the bulky "basic
headphones'' of yesteryear. Your receiver provides two
headphone jacks to make it very easy for two people to listen
together.