Advertisement
FM ANTENNAS
Since FM broadcast signals travel along a straight.
direct-line path. they become rather weak behind hills and
buildings even in the vicinity of a broadcasting station. FM
signals also become weak in areas distant from a station
even though there may not be any obstruction to the
direct-line path of the signal. Therefore. a good FM antenna
should be installed in the most effective manner for best
possible FM reception.
Direct Wave and Reflected Wave
FM Outdoor Antenna
Consult with your dealer or service man about the best
method of selecting and erecting an outdoor FM antenna.
The choice of lead-in (feeder) wire is also important. The flat
ribbon-shaped twin lead performs well electrically, is
cheaper and is somewhat easier to handle in routing through
windows and around rooms.
expensiv e. does a much better job of minimizing inter
ference. is less _ p rone to the effects of weather and c lose-by
metal objects. and is nearly as good a signal conductor as
the ribbon type wire.
The latter is particularly true of
foam-type coaxial cables. Coaxial cable is somewhat more
difficult to install at the point where the cable enters the
building. If coaxial cable is selected. make sure the antenna
is designed to drive that type of cable. In many cases a
matching transformer (balun) must be used to connect the
antenna terminals to the coaxial cable.
Not e : ----------------------
Do not make connections to 300!1 and 75!1 antenna terminals
simultaneously.
•
To minimize auto-ignition noise. locate the antenna as far from heavy
traffic as possible.
•
Keep the feeder or coaxial cable as short as possible. Do not bundle or
roll up excess cable.
•
The antenna should be at least two meters (6.5 feet) from reinforced
concrete walls. or metal structures.
FM Outdoor Antenna Erection
KR-770 (K)
6
- � .
Weakened
Signal
Coaxial
cable is more
More than 4 meters
J
( 13 feet) above the
FM Indoor Antenna
Connect the T-shaped indoor antenna (supplied) to the
3000 FM ANTENNA terminals. Spread the two arms that
form the top of the "T" horizontally and hold them against
convenient wall surfaces.
results on your favorite stations. Tape the antenna in place
where the best compromise is found between listening
results and appearance.
AM ANTENNAS
AM Loop Antenna
Tune to your favorite AM station and position the loop
antenna for best reception. Try other stations and find the
position that gives best overall reception.
When this unit is mounted in a rack or placed on a
shelf with insufficient space behind. remove the loop
antenna and hang it from a wall in the direction which gives
best reception.
If the length of the lead wire is too short.
add a lead wire of an appropriate length.
Detachable
AM Loop Antenna Adjustment
AM Outdoor Antenna
In concrete buildings or at a great distance from the
transmitter. it may be necessary to install an outdoor wire
antenna. The end of this wire should be stripped of insula
tion and connected to the AM terminal.
At this time. keep the loop antenna connected.
Try several locations for best
Remove from the unit
and hang it from a wall.
Vary the direction of
the loop antenna
Advertisement
