McIntosh MR 7083 Owner's Manual page 16

ANTENNA INPUTS
FM
The MR 7083 is provided with a 75 ohm coaxial
antenna input. It is a standard "F" connector that
mates with most common antenna and cable service
feedlines. This type of input combines low loss with
interference rejecting shielding.
A matched dipole antenna is provided for average
reception. However, optimum performance is
obtained with an outdoor highly directional beam
antenna and rotator.
Although a 75 ohm coaxial feedline offers the best
noise and multipath rejection, many antennas use
300 ohm twinlead. If this is the case, a matching
transformer (balum) can be used.
AM
The AM antenna input on the MR 7083 is unusual
in that it will accept almost any type of antenna. In a
location of moderate signal strength and little
interference (few fluorescent lights, motors, TV sets,
etc.), the new Low Impedance Loopstick will give
good performance. In a rural area, an outdoor
long-wire might be desirable. However, the best
over-all performance in a weak signal area can be
obtained by using a shielded loop antenna.
The shielded loop is a bi-directional antenna. Its
maximum signal pickup occurs when the station lies
in the same plane as the loop. Minimum signal is
perpendicular to the loop. This characteristic can be
used to advantage by arranging the loop so that an
unwanted signal, noise or interfering station, is in
the pickup null.
REMOTE CONTROL
A 15 pin subminiature D connector is provided on
the rear panel for interfacing the MR 7083 with
Mclntosh IR remote control systems.
14 TECHNICAL DESCRIPTION