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"'i"d1
75·ohm
coaxial cable
without
"F" connector
Figure 2. AM/FM Antenna Connection
signals available at this pair of jacks are not
affected by the BALANCE, VOLUME, TREBLE,
BASS, HI FILTER, LOUDNESS, and MONO
pushswitches on the front panel.
AUX INPUTS
The AUX INPUT jacks are for miscellaneous high
level signal sources such as additional tuners
and/or receivers, tape players, phonographs that
provide RIAA equalized high level output, TV
sound outputs and other external components.
FM ANTENNA
The best FM reception is obtained with a Log-
Periodic type antenna mounted on a good quality
rotor system. For fringe areas, Marantz recom-
mends a Log-Periodic antenna with six or more
elements designed expressly for FM reception.
To minimize local noise and multipath picked up
by the lead-in wires, use a balanced and shielded
300 ohm cable or a coaxial 75 ohm cable with a
300 to 75 ohm matching transformer at the
antenna. Unshielded lead-in acts as an omni-
directional antenna, and can cancel the direc-
tional benefits of your antenna. Low-loss 300
ohm shielded cable consists of two inner conduc-
tors plus an outer shield and insulating jacket.
This type of shielded cable effectively prevents
the lead-in from contributing multipath distor-
tion.
For rural areas, it is recommended that a local
dealer be consulted about antenna installation
and lightning arrestor protection. Master antenna
systems are not recommended for use with your.
Figure 3. AM Ferrite-rod Antenna
Model 2252; such systems are usually designed
expressly for television reception and frequently
suppress FM signals before distribution. In addi-
tion, master antenna systems often severely re-
duce the quality of the FM signal. Where outdoor
antennas are prohibited or inconvenient, place the
antenna in vacant attic space or use a simple 300
ohm TV "rabbit ear" antenna or the ribbon-type
folded dipole antenna supplied with the Model
2252. Both are practical and will give satisfactory
results in primary signal areas.
Figure 2 shows connection methods for various
antennas. If 75-ohm cable is desired, we recom-
mend using the type with an "F"-type connector
terminal attached to the cable. This is the easiest
type of cable to connect and disconnect.
AM ANTENNA
Your Tuner is equipped with an AM ferrite-rod
antenna. BEFORE USING THE MODEL 2252,
SWING THE ANTENNA OUT AS SHOWN IN
FIGURE 3.
The ferrite-rod antenna will give you satisfactory
results in primary signal areas. However, an out-
door antenna will provide better reception in
weaker signal areas.Three single wires are required
to make an AM outdoor antenna. First, connect
one end of a single wire to the AM ANTENNA
terminal on the rear panel, and the other end to a
very high horizontal antenna wire of 25 to 75 feet
in length suspended between insulators in an out-
door location (the higher the better). Next, con-
nect the third single wire between the
"G"
terminal of your Model 2252 and an authenti-
cated earth ground (such as a metal water pipe).
2
6


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