Pioneer tx 9800 owners manual

Page 1

AM/FM STEREO TUNER

X-QBDD

OPERATING INSTRliCTIONS KU

l l l
r 1
Before operating your TX-9800 AMIFM STEREO
TUNER, please read these Operating Instructions Mg
through and then you will know how to connect the
, , stereo tuner properly and operate the tuner correctly.
This will ensure that you enjoy the stereo performance
ll _, to the full.
Walnut gralned vinyl top and side panels are used in the An reading the}? instructions, keep them m d safe
comwcmn of mi, cabin, place together With the warranty card. Then you Will
know exactly where it is in case you wish to refer to it. ~~~~~
_ i .-
Features ........................... 2
i Connection Diagram .................. 3
m P _ T A W Installation Precautions ................ 3 i
i Connections ........................ 4
Antenna and Ground Connections ....... 4
Front Panel Facilities ................. 6 _
Listening to Broadcasts ................ 7
Accessory Functions .................. 8 -
FM~Dolby Reception ................. 8
Installing the FM Antenna ............. 9
PM Multipath Distortion .............. 10
Specifications ....................... 1 1
Conditions Frequently Mistaken
for Malfunctions ................... 12
Schematic Diagram .............. Insertion
IMPORTANT NOTICE
__ The serial number for this equipment is located on the

rear panel. Please write this serial number on your
enclosed warranty card and keep in a secure area. This w ,-
is for your security.

WARNING: TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THS

GDPIONEER APPLIANCE TO RAIN OR MOISTURE.

. : llllll

Page 2

FEATURES

RF Amplifier 2-stage FM Front End with
S-gang Variable Capacitor

The RF amplilier 2-stage front end incorporates a Segang
variable capacitor and three dual-gate MOS FETs. A capaci-
tance-coupled double tuned circuit is inserted between the
RF amplifier stages. Those features produce impressive
characteristic's such as an lHF sensitivity of 8.8dBf, a
spurious response of over llOdB and an image interference
ratio of over l20d8.
oscillation variable capacitor, and very fine and accurate
tracking adjustments are performed in order to greatly
improve the scale accuracy.

Quartz Sampling Locked FM-APC Circuit for
Optimum Tuning Point

An automatic phase control (APC) circuit is adopted so
as to safeguard against drift in the local oscillation
lrcquency caused by fluctuations in the temperature and
humidity. The frequency of the output signal from the
highly accurate quartz crystal oscillator is demultiplied
down to lOOkl-lz and used as the reference signal. This
enables the frequency signal of the broadcasting station to
be locked properly, and allows the tuner to maintain the
optimum tuning point when receiving signals over pro-
longed periods of time or when recording programs on the
air.

Touch Sensor FM Tuning Lock System

This tuner features a touch tuning system. Its quartz
sampling locked APC circuit, which locks the optimum
tuning point, swings into action as soon as you remove your
hand from the tuning knob after you have tuned in a
station. When the tuning knob is rotated and the signals
from the broadcasting station are picked up, the TUNE
indicator comes on as soon as you arrive at the optimum
tuning point, and when you remove your hand from the
tuning knob, the touch sensor enables or allows the APC
circuit to be activated and the signals to be locked to the
optimum tuning point. At the same time, the LOCKED
indicator comes on to indicate that the stable reception
mode is being maintained.

Selectable Bandwidth FM-AM lF Amplifier

According to the signal conditions, the FM-AM IF
amplifier can be selected for wide band [high fidelity} and
narrow band (high selectivity) modes in order to improve
both the sound quality and the reception performance.

A dual-element linear phase ceramic filter which pos-
sesses an excellent group delay response is used for the FM
wide-band mode. This helps to reduce distortion and
improve separation and the overall performance, and also
provide high-fidelity FM reception with a good linearity.

A lO-elcmcnt linearphase ceramic filter is used for the
narrow-band mode to obtain a usable selectivity of 85dB.
In addition, interference-free reception becomes possible
even in locations where a strong interference signal is
adiacent to the station whose signals you are tuning in.

The same type of configuration is featured for the AM
section. A 3-pole, 7elcment LC bandpass filter is used for
the AM wide-band mode, and a narrow-band ceramic filter
added to above filter is employed for the narrow band
mode. As a result, interference and beat are suppressed
and the signals which are received always yield the opti-
mum sound quality.

MPX Circuitry Adopting PLL lC with Built-in
Automatic Pilot Signal Cancelling Circuit

The FM demodulator employs a negative feedback PLL
MPX IC with a built-in automatic pilot signal cancelling
circuit. This enables the pilot signal to be cancelled out
automatically without compromising the high-range fre-
quencics.

High-performance AM Tuner with IC

The AM tuner incorporates a linear frequency 3-gang
variable capacitor tuned type of RF amplifier circuit and a
highly sensitive, low distortion lC. These features increase
the image interference and IF interference reicction capa-
bilities of the tuner. An optimum AGC voltage is supplied
to each section, providing stable reception with low
spurious interference and distortion even in localities with
strong field strength areas.

High~accuracy Design for Sure-fire Reliability

The dial scale features a solid diamond~cut finish, proof
enough of the very high accuracy it can guarantee.
Moreover, the large-sized meters for easy read-out and the
lever switches crafted for the best in handling ease help
make up the overall design which virtually radiates with
quality and sophistication.