571041
15
Zoom out
Zoom in
Previous page
1/19
Next page
generated by a local oscillator. This mixer converts
the carrier frequency to the 10.7MHz intermediate
frequency. Careful attention to its thermal and
electrical characteristics has minimized drift, thus
obviating the necessity for AFC. The 10.7MHz
converted signal is then fed to a phaselinear
ceramic IF filter, followed by an IC limiter. It is
then, in turn, processedthrough an FM discrimina-
tor. The output of the FM discriminator is fed to a
buffer amplifier which then drives the demodula-
tor.
IF STAGES
The IF section consists of four transistors and six
ceramic filters. The characteristics of this filter are
ideal in that the 200KHz passband is phase-linear,
with sharp cut-off slopes. Its exceptional phase
linearity assuresthe elimination of a major source
of high-frequency distortion and a loss of stereo
separation. The sharp cut-off slopes provide im-
proved selectivity, permitting reception of closely
spacedchannels.
LIMITER
The Model 2230 utilizes multi-stages (transistor
plus limiterdiodes and IC) limiter amplifier with a
very small dynamic symmetrical aperture, elimi-
nating the need for AGC circuit which introduces
low frequency distortion. Undesirable Amplitude
Modulation (AM signals, AM noise, AM distortion)
are removed from the IF signal within the limiter.
FM STEREO DEMODULATOR
The composite audio signal from the buffer am-
plifier is fed into the multiplex stereo demodulator
circuit consisting of 11 transistors and 6 diodes.
The 19kHz pilot signal contained in the composite
audio signal is doubled into 38kHz after two-stage
amplification and then the 38kHz signal is further
ampl ified to the level necessary to drive the diode
switching circuit. The composite audio signal is
split into the right and left channels by the 38kHz
switching signal in the diode matrix circuit. The
right and left channel audio signals are processed in
the crosstalk cancelling circuit which utilizes com-
plementary configuration with NPN and PNP
transistors. The audio signals are then fed into the
selector switch and the TAPE OUT jacks from
the low pass filters for filtering undesired 19-and
38kHz components and emitter followers for
10vI/
impedance output.
The stereo demodulator circuit has been designed
with the de-emphasis netlNOrk to provide flat
frequency response up to 15kHz. One hundred
percent air-tight coils and filters are incorporated
in the stereo demodulator circuit for improved
stabil ity and reiiability with good stereo separation
and frequency response. '
The multiplex stereo demodulator circuit has been
provided with an automatic stereo/monaural
switching circuit. The circuit checks the input
signal intensity and activates the stereo demodula-
tor circtlit and the stereo indicator lamp auto-
matically only when the input signal is powerful
enough to provide good quality stereo reception.
When t~e input signal strength is below the
threshold level, the FM stereo broadcast is process-
ed as monaural signal and improved signal-to-noise
ratio is obtained in this mode of operation.
MUTING CIRCUIT
In the absence of an FM carrier, all FM receivers
produce a peculiar noise. The muting circuit
eliminates this noise, providing you with noise-free
tuning from station-to-station.
A muting circuit, consisting of a two-transistor
noise amplifier and a three-transistor (including
one FET) switching circuit, has been incorporated
in the Model 2230. The muting circuit perfectly
mutes out all the ir'lterstation noise and also
completely mutes out the side slope spurious
response of the unit. The circu it has been designed
to minimize annoying "pop" noise for velvet
smooth tu ne in and tu ne out.
AM TUNER
The AM tuner portion of the Model 2230 has been
provided with a tuned RF amplifier incorporating a
three-section variable capacitor for improved
spurious responseratio.
The ceramic filter utilized in the AM IF amplifier
comes with high.er selectivity and wider bandwidth
for interference-free hi-fi AM reception.
Following the AM IF amplifier, the AM detector
recovers the audio modulation and provides this
signal to the selector switch.
The AM tuner and IF amplifier are subjected to the
action of an effective automatic volume control
circuit which maintains constant the level of all
stations in the AM band.
SELECTOR SWITCH
Your Model 2230 has the capability to operate
from a variety of program sources, e.g., AM or FM
broadcasts, turntable (PHONO), tape recorders
(TAPE) or any other source capable of providing
100 millivolts output level (AUX). The selector
switch connects the inputs of the TONE amplifiers
12
15


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Marantz Model 2230 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Marantz Model 2230 in the language / languages: English as an attachment in your email.

The manual is 12,09 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info