Bedienungsanleitung Marantz Model 2230 (Seite 7 von 19) (Englisch)

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shielded 300-ohm cable. (An unshielded lead-in

wire can act as an omnidirectional antenna, and

can cancel the directional benefits of your

antenna.) Low-loss 300-ohm shielded cable consists

of two inner conductors plus an outer shield and

insulating jacket. This type of shielded cable

effectively prevents the lead-in from contributing

multipath distortion.

For rural areas, it is recommended that a local

dealer be consulted about antenna installation and

lightning arrestor protection. Master antenna

system are not recommended for use with your

Model 2230; such systems are usually designed

expressly for television reception and frequently

suppress FM signals before distribution. In

addition, master antenna systems often severely

limit good quality FM reception.

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FM ANTENNA

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FM ANTENNA

SINGLE WIRE

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AM ANTENNA

Where outdoor antennas are proh ibited or

inconvenient, use a simple form of 300-ohm, TV

"rabbit ear" antenna or the simple ribbon-type

folded dipole antenna supplied with the Model

2230. Both are practical and will give satisfactory

results in primary signal areas. Your Model 2230

Receiver will accept either a 75-ohm or 300-ohm

antenna. (See diagram Figure 3.) The 30().ohm

antenna cable should be connected to the two

terminals marked FM on the ANTENNA terminal.

When using 75-ohm coaxial antenna cable, connect

its shield to the "G" (GROUND) terminal, and its

inner or center conductor to either of the FM

terminals.

(Note: Close inspection of standard zipcord will

reveal some form of coding on the insulation, e.g.,

ridge or groove on one edge, one of the wires may

be "silver" while the other is bare copper.) Coded

wires help insure identical connections for each

channel.

For each channel, the coded wire can be connected

between the "common" terminal of your

loudspeaker and the GROUND terminal of the

amplifier channel. The remaining uncoded wire is

then connected between the remaining loudspeaker

and amplifier terminals. This insures correct

polarity or phasing of identical loudspeakers.

If there is any doubt about phasing of loudspeaker

pairs, or if they are not identical loudspeakers, a

simple listening test can verify correct phasing.

With program signals fed to both channels, and

with the MONO pushswitch depressed, the sound

should appear to originate at a point midway

between the loudspeakers, with the balance control

centered. As the balance control is turned away

from the center position, the sound source should

appear to move toward one of the loudspeakers.

Room acoustics can sometimes make this test

ambiguous or confusing. If so, temporarily move

the loudspeakers asclose together aspossible. Then

set the controls for balanced MONO operation and

listen to program material with strong bass pass-

ages. Reverse the wires to one of the loudspeakers

and Iisten to the same passageagain. If there is

noticeably less bass with this reversed connection,

change the connections back to the original ar-

rangement. If there is noticeably more bass, leave

the wires connected in reverse.

These phasing procedures should be used with each

stereo pair of loudspeakers, whether MAIN or

REMOTE. If both pairs of loudspeakers are used in

the same listening area, ensure that the MAIN

pair is also "in phase" with the REMOTE pair.

CAUTION:

NEVER DIRECTLY CONNECT THE lOUD-

SPEAKER TERMINALS OF ONE CHANNEL

IN PARAllEL WITH THOSE OF ANY

OTHER. ANY RESULTING DAMAGE IS

NOT COVERED UNDER WARRANTY.

Figure 3. FM/AM Antenna Connection

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

recommends a Log-Periodic antenna with six or

more elements designed expressly for FM

reception. For minimum local noise and multipath

pickup by the lead-in wires, use a balanced and

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