Fold out the photographs on the inside of the back
cover. They will assist you in connecting the MR 7083
to your system. The numbers on the photographs refer
to the paragraphs that follow.
The back panel of the MR 7083 has connectors
labeled AUDIO OUTPUT, REMOTE CONTROL, AM
antenna, 75 OHM FM antenna, SCOPE OUT, and AC
power used to interconnect with associated
equipment and the AC power line. Use shielded
cables to connect the output signal to a preamplifier
or power amplifier. To minimize the possibility of
hum, the shielded cables should be of parallel
construction or loosely twisted together and located
away from the speaker connecting cables and AC
power cords. Be certain to use good quality shielded
cables for all interconnections. Your dealer can
advise you on the kind and length of cables that will
best suit your installation.
1. AUDIO OUTPUT
Use the FIXED AUDIO OUTPUT jacks on the
rear panel to feed program to equipment which
has its own volume control. The output level is a
nominal 1.2 volt for 100% FM modulation. The
low output impedance permits long audio cables
to be used without a loss of high frequencies due
to cable capacity.
2. VARIABLE OUTPUT
The VARIABLE OUTPUT jacks are used when you
wish to adjust the tuner output level to match
other program sources. The low output
impedance permits long audio cables to be used
without a loss of high frequencies due to cable
capacity. The output level is easily adjusted by
turning the output level screw with a screwdriver.
3. REMOTE CONTROL
The REMOTE CONTROL connector is designed
for use with the Mclntosh infrared remote control
systems. With these systems, you can, from a
hand-held remote control, turn on the tuner and
the system, select from eight preprogrammed
stations on either FM or AM, search sequentially
the programmed stations on FM or AM and scan
the entire FM or AM band.
4. AM ANTenna
Adjust the AM loopstick for best AM reception.
Do not leave it positioned against the back panel.
To do so will reduce the signal reception.
In noisy AM locations, we recommend that an
external shielded loop antenna be used. A
shielded loop antenna is made from a length of
single conductor shielded wire; microphone cable,
coaxial cable, etc., arranged in a single turn loop.
For best reception, orient the loop vertically. It
may be attached around the frame of a window
behind a curtain, on the back of the equipment
cabinet, or in some similar way. Signal strength is
proportional to the size of the loop; the larger the
loop, the greater the received signal.
To prepare the antenna from the shielded
cable, strip ¾ of an inch of outer insulation from
each of the cable ends. From one end, completely
remove the exposed ¾" of shielding. Then
remove 3/8 of an inch of insulation from the
center conductor.
Insert the exposed center conductor into the
AM ANT push connector. Make sure the cut off
shield does not come in contact with anything.
On the other end, leave the shield intact and
strip % of an inch of insulation from the center
conductor. On this end only, twist the exposed
center conductor and the shield together.
Insert the twisted shield and center conductor
into the ground (GND) push connector.
5. FM ANTenna
The antenna input impedance is 75 ohms
designed to be fed by coaxial antenna cable. The
input connector is a "Type F" which mates with
cable company feed lines and coaxial cable.
Interference rejection and low signal loss are
among the benefits of coaxial cable.
Any one of four different FM antenna systems
can be used with your MR 7083. 1) an outdoor FM
antenna, 2) an all-channel (UHF-VHF-FM) antenna,
3) a cable input from your local cable company,
or 4) the indoor dipole supplied.
A 75-ohm outdoor antenna designed for FM
reception is recommended for optimum
performance in all areas. In fringe areas, best
6 HOW TO CONNECT
