The green AC power outlets are protected with a
one amp fuse. Any increase in the value of this fuse
will affect the protection of the sensing circuit and
may cause damage.
A VHF-TV antenna can be effective when it is
designed for both FM and TV reception. Connect the
two leads from the VHF-TV antenna to the ANTEN-
NA 300W FM push connectors.
CONNECTING PROGRAM SOURCE GROUNDS
A single GROUND post is provided to which
grounds for turntables, record changers, tape decks,
etc. are connected. To prevent hum pickup, the left
and right program cables and the ground wire from
that source should be wound or twisted together.
Make sure the ground wire does not make any con-
nection to the shields of the left and right program
cables between the source and the input of the MAC
4100.
FM PRESELECTOR SWITCH
FM receivers can be overloaded by very large
antenna input signals when the receiver is located
very near to a FM broadcasting station or when a
high gain directional antenna is used in a
metropolitan area.
The preselector may be switched into or out of the
FM RF circuit by a slide switch located on the MAC
4100 rear panel near the AM antenna.
We recommend that the FM Preselector switch be
used in the "out" position for all FM listening condi-
tions except where there is evidence of overload by
strong stations. In that case, the "in" position will
immunize against overload. For most stations there
will be no listening difference between the two
switch positions.
MAC 4100 receivers with serial numbers below
BY3000 do not have the FM preselector switch
described above.
CONNECTING AN FM ANTENNA
One of three antenna systems can be used: [1] an
outdoor FM antenna, or [2] a VHF-TV antenna, or [3]
the indoor dipole supplied.
An outdoor antenna is recommended for optimum
performance in all areas, In fringe [outlying] areas,
best results will be obtained with a highly direc-
tional FM antenna used in conjunction with a
rotator. If the antenna uses a 300 ohm lead, connect
it to the ANTENNA 3000 FM push connectors.
The coaxial cable of an unbalanced 75 ohm anten-
na connects to the rear panel ANTENNA 750 FM
type F coaxial connector.
An outside antenna system should not be located
in the vicinity of overhead power lines or other elec-
tric light or power circuits, or where it can fall into
such power lines or circuits. When installing an out-
side antenna system, extreme care should be taken
to keep from touching such power lines or circuits
as contact with them might be fatal.
CONNECTING AN INDOOR DIPOLE ANTENNA
The flexible folded dipole antenna [300 ohm] is for
use in urban or high strength signal areas. Connect
the two leads from the dipole to the ANTENNA 300W
FM push connector.
The flexibility of the twin flat wire assembly per-
mits it to be placed under a rug, tacked behind the
stereo ... or placed in any other convenient location.
In some cases, it may be necessary to "position" the
antenna for best signal reception. This should be
done before it is permanently located.
Avoid locating the antenna next to other wires or
metal objects. Any indoor antenna may be ineffec-
tive in houses having metal siding or metal foil in-
sulation.
AM ANTENNA
For local and most moderately distant AM recep-
tion the built-in ferrite loopstick antenna may be us-
ed. The AM loopstick antenna is on a swivel base
and must be adjusted away from the chassis for best
reception.
Distant reception can be improved with the use of
a copper antenna wire 50 to 150 feet in length. Sus-
pend the wire in a straight line as high as possible.
Attach the wire at each end with suitable glass or
ceramic insulators. Connect a lead-in wire at any
convenient point on the antenna. It is recommended
that a lightning arrester be used with an outdoor AM
antenna. The arrester should be well grounded to a
ground rod or cold water pipe.
CONNECTING A MAXIMUM
PERFORMANCE INDICATOR
The scope TP1 and TP2 jacks on the rear panel are
used to connect a Mclntosh maximum performance
indicator or an oscilloscope. Follow directions
outlined in the maximum performance indicator
owner's manual.
FUSES
A 4-amp SLO BLO fuse protects the receiver cir-
cuits. The fuse does not protect additional equip-
ment connected to the rear panel AC power outlets.
A one amp fuse protects the turntable auto on cir-
cuit. If this fuse opens, power to the green outlets
will be interrupted.
6
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