Pioneer TX-9800 User manual

AM/FM STEREO TUNER
OPERATING INSTRUCTIONS
X=938s00
Walnut grained! viny! top and side panes are used in the
Before. operating your TX-9800 AM/FM STEREO
TUNER, please read these Operating Instructions
‘through and then you will know how fo connect the
stereo tuner properly and operate rectly
This will ensure that you enjoy the stores performance
to the full
After reading these instructions, keep them in a safe
place together with the warranty card, Then you will
know exactly where it isin ease you wish to reler to It
CONTENTS
Features ...0.. 00. a
Connection Diagram a
Installation Precautions. 8
Gonnections . 4
Antenna and Ground Conne 4
Front Panel Facilities 6
Listening to Broadeasts. : 7
Accessory Functions... 8
FM-Dolby Reception 8
Installing the FM Antenna 9
FM Multipath Distortion . . 10
Specifications u
Conditions Frequently Mistaken
for Malfunctions .......ssseeseseeee 12
Schematie 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 vecure atea. This
1s for your security
WARNING: TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.
1

FEATURES
RF
Amplifier
2-stage
FM
Front
End
with
S-gang
Variable
Capacitor
The
RF
amplifier
2-tage
Irant
end
incorporates
«
5gang
variable
capacitor
and
three
dualgate
MOS
FETs.
A
capaci
tance-coupled
double
tuned
circuit
is
inserted
between
the
RF
amplifier
stages.
Those
features
produce
impressive
tharacteristies.
Such
ay
an
IMP
sensitivity
of
8.8dBK,
a
spurious
response
of
aver
T10UB
andl
an
image
interference
atio
of
over
1204.
oscillation
variable
capacitor,
ancl
yery
fine
and
accurate
racking
adjustments
are
performed
in
order
to
greatly
Improve
the
seale
accuracy.
Quartz
Sampling
Locked
FM-APC
Circuit
for
Optimum
Tuning
Point
‘An
automatic
phase
contecl
(APC)
circuit
is
adopted
so
as
40
safeguard
against
drift
In.
the
Local
oscillation
frequency
caused
by
fluctuations
in
the
temperature
and
humigity.
The
frequency
of
the
output
signal
from
the
hignly
accurate
quartz
crystal
oscillator
is
demultiplied
down
to
100kHz
and
used
as
the
reference:
signal.
Thi
enables
the
frequency
signal
of
the
broadcasting
station
to
bbe
locked
properly,
and
allows
the
ner
co
maintain
the
optimum
tuning
point
when
receiving
signals
over
pro
longed
pariads
af
time
or
when
recording
programs
on
the
Touch Sensor FM Tuning Lock System
This tuner features a touch ning system, Its quartz
sampling
locked
APC
circult,
which
locks
te
optimum
tuning
point,
swings
into
action
as
soan
as
you
remave
your
hand
from
the
tuning
knob
after
you
have
tuned
in
a
station,
When
the
tuning
knob
is
rotated
and
the
signals
from
the
brosécasting
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
sensar
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 boing maintained.
Selectable Bandwidth FM-AM IF Amplifier
According to tne signal conditions, the FM-AM IF
amplifier can be selected for wide band (high fidelity) and
riarrow band (high selectivity) medes in order to improve
bbath the sound quality and the reception performances.
‘A dual-clement linear phase ceramic filter which pos
sesies an excellent group delay response is used for the FM
wide-band meds, This helps to reduce distortion and
improve separation and the overall performance, and also
provide high-fidelity FM reception with a good linearity
‘A LDvelement linear phase ceramic filter is used for the
narrow-band mode to obtain a usable selectivity of 8548.
In addition, interferencectree reception becomes possible
even in locations where a strong, Interference signal ts
adjacent to the station whose signals you are tuning in,
The same type of configuration is featured for the AM
section, A 3ipole, T-element LC bandpass Filter
the AM wide-band mode, and 2 na
added to above filter is employed for the narrow band
mode. As a result, interference and eat are suppressed
and the signals which are received always yield the opti
‘mum
sound
quality.
MPX Circuitry Adopting PLL IC with Bi
Automatic Pilot Signal Cancelling Circuil
‘The FM demodulator employs a negative feedback PLL
MPX.IC with a builtin automatic pilot signal cancelling
circuit, This enables the pilot signal to be cancelled 0
automatically without compromising the high-range fre
‘ow band ceramic filter
High-performance AM Tuner with IC
The AM tener inccxporates a linear frequency 3-gang
ned type of RF amplifier circuit and a
highly sensitive, low distortion IC. These features increase
the image interference and IF interference rejection capa
hilites of the tuner. An optimum AGC voltage is supplied
fo each section, providing stable reception with low
spurious interference and discortion ever in Tocalites with
strong Field sirength areas,
variable capacitor
High-accuracy Design for Sure-fire Reliability
The cial 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
ake up the overall design which virwally radiates with
quality and sophistication

CONNECTION DIAGRAM
TOUGH SENSOR
_| BAIN enieeh
INSTALLATION PRECAUTIONS
Vo ensure a long and reliable performance, avoid installing this model in any of the following locations:

CONNECTIONS
Connection Precautions
© The tuner's output jacks as welll as the con-
necting jacks on the stereo amplifier, one being
for the left (L) channel and the other for the
right (R) channel. Make sure that you connect L,
to Land R to R correctly.
© Plug the connecting corcs firmly into the jacks;
loose connections can generate noise.
* Do not bundle the input and output cords with
‘the power and speaker cords. Also avoid using
cords which are longer than required and bunch-
ing them, These practices can result in noise,
impaired sound quality, and possible operating
difficulties
CONNECTIONS TO A STEREO AMPLIFIER
Use the accessory pin play connecting cords to
connect the TUNER or AUX jacks of the stereo
amplifier with the output jacks (VARIABLE) of
the tuner,
I
| °
Stoae ampli
3 Gam Romooreco |
eve
atu jake
Leman
VARIABLE ces Reborn
AAccesory connecting core
ANTENNA AND GROUND CONNECTIONS
FM ANTENNAS
‘There are two methods you can use when connect=
ing the PM antenna to the antenna input terminals:
you can use a 800-ohm twinlead feeder or a 75
ohm coaxial cable.
Pioneer recommends the 75-ohm coaxial cable
(RG5OU, ote.) if you want your tuner to display
its capabilities to the full. The coaxial cable is more
effective than the twinlead feeder in safeguarding
against external interference noise from impairing
the sound quality. In other words, twinlesd feeders
are liable to pick up external noise, and this is why
they are not recommended
CONNECTIONS USING A 75-OHM COAXIAL
CABLE
Refer to Fig. 2 and follow the procedure. Prepare
the tip of the coaxial cable and connect it to the
anienna input terminal (752-UNBAL}
1580 coswial cable
750. UNBAL
(rowed
Fig. 2

In cases where it is only possible to use a twinlead
feeder with « community receiving system antenna,
refer to Fig. 3 and follow the procedure. Prepare
the ends of the twinlead feeder and attach them to
the 3009-BAL antenna input terminals. ‘Then
make the twinlead feeder as short as possible but
do not hurdle the wires or run them loose on the
floor.
ACCESSORY T-TYPE ANTENNA.
This antenna is designed to allow you to receive
FM programs in areas where strong signals are
beamed by broadcasting stations until you install
your FM antenna. As shown in Fig. 3, attach the
antenna to the 800@-BAL antenna Input termi-
nals and then tune into an PM station, following
the instructions listed under “LISTENING TO
BROADCASTS” on page 7. Extend both ends of
the antenna horizontally, loeste the optimum re
ceiving location by moving the antenna to the left
or right, or up or down, and then secure it to the
ceiling or wall
AM ANTENNAS:
While listening to AM stations (see AM Reception
‘on page 7), move the rear panel ferrite bar antenna
and position it for bost reception.
‘© Seloct the desired AM station, and move the bar
antenna around in every direction and then set it,
at the position where the best reception is
obtained.
@ In cases when the bar antenna is insufficient for
adequate reception, an indoor AM antenna can
be made from a length (5 to 6 meters) of vinyl
insulated wire. As shown in Fig. 5, connect one
end of the wire to the AM antenna terminal and
suspend the free end from a wall or ceiling at as
high a location as possible.
© If reception is still difficult with an indoor
antenna, use vinyl insulated wire to erect an
outdoor AM antenna between two supports at
shown in Fig. 8,
GROUNDING
From the viewpoint of both safety and reduced
noise, Pioneer recommends that you employ a
ground as shown in Fig. 5. Connect the ground lead
to the GND terminal of the tuner. Never connect
it to a gas pipe or other dangerous location,
PIONEER
FM ouidoor antonne
Tas
Fig. 3
Nove bor anterns
{vinyl insutated viral
oo ee)

FRONT PANEL FACILITIES
POWER SWITCH
Set 10 ON position to turn on power, Pilot lamp will light
SIGNAL METER:
This meter indicates the antenna input level of the AM.
and FM broadcasting waves. The higher the input leet,
the more the meter deflacts toward right, When salecting
the desired-station, find the pesition of the tuning knob
which effects the maximum deflection of the meter
pointer. When selecting an FM station, also observe the
{uning meter to determine the optimum tuning point
MEMORY MARKERS
Convenient for designating most often tuned in stations.
Slide markers with fingertip to desired positions,
;—TUNING METER
This meter indicates the optimum tuning point inrespecs
tive of the field swengih when selecting an FM station,
With no signal, the pointer remains at the center as 3
signal i tuned in, it deflects to the right or lefe; when the
signal is tuned in accurately, the pointer will corvectly
move to the center of the seale. If the tuning knob is ad
justed further, the pointer dellects to the right or left;as
the signal moves off completaly, the pointer roturns to the
center postion again
[-FM-STEREO INDICATOR
“This incicator lights up when the tuner is receiving &
stereo program if the FM MUTING/MODE swi:eh is ser to
AUTO,
FM.TUNE INDICATOR
‘This indicator lights up when the optimum suning point is
obtain
FM/AM INDICATORS
“Those indicators light up during an FM or AM reception,
respectively
Pilot tame:
OUTPUT LEVEL KNOB
This knob isused to adjust the output leva of the variable
output jacks. When itis rotated in the direction of MAX,
the output level is increased. For further details, refer to
‘OUTPUT LEVEL KNOB" on page 8,
TUNING KNOB——————_——
This knob is used for solecting stations, When selecting an
|AM station, observe the signal meter, and when selecting
{An FM station, observe bot the signal meter and the
tuning meter
FUNCTION SWITCH.
This switch fs used to select the type of broadcasting
FM... .. For reception of FM broadeasting
AM... For seception of AM broadcasting,
FN-AM IF BAND SWITCH
FM and AM IF (intermediate frequency) passband can be
set to For wide or marrow.
This switch is used to salect between NARROW (narow
band) and WIDE (wide hand). tn this way, «1s possible
to chinge over the pass bandwidth of the intermediate
Frequency signals
NARROW... When tuning in the desired station, and it
adjacent station interference Is «problem
AL the WIDE setting, set lich 10 this
postion
WIDE Set the switch to this position after the
Uesired station was received without ad
jacent station interference,
For further dotails, refer to “FM-AN IF BAND SWITCH"
fon Page 8)

FM-LOCKED INDICATOR
With the funetion switch set to FM and che FM muting
mode switch set Lo ON, this Indicator lighs up when you
lake your hand off the wning knob at the optimum
Luning point, This light indicates that the guarte locking
ciceuit has been activated by th
tector circuie and the frequency af the circuit fs locked to
he frequency of the station,
FM MUTING/MODE SWITCH
When this switch i sot to ON, unpleasant interstation
noise is eliminated, which makes selection of stations
builtin touch sensor de
casier, However, if the muting switch is ot 10 ON in areas
the field strength is extremely weak, the station be
ing received may also disappoar. In such areas, therefore,
the muting switch should be turned OFF, When this
switch is sot 10 OFF, monaural reception will be obtained
leven though the station is broadeasting a stereo prog
FMPX NOISE FILTER SWITCH
If comparatively high frequency noise is noticed during
recaption of a stereo program, this switch is set to ON.
Stereo separation will thereby semewhar deteriorate
This switch should normally be kept OF
wh
LISTENING TO
BROADCASTS
ot ot
|
Fig.
6
EM RECEPTION
1, Set the power switch to ON.
2, Set the funetion switch to FM.
3, Set the FM muting switeh to ON.
4. Set the FM-AM IF band switch to NARROW. If,
the desired station can be received Clearly with-
ub adjacent siation interference, set this switch
to WIDE after completing the selection. Por fure
ther details regarding this operation, refer to
“EN-AM IF band switeh” on page 8.
PIONEER
5. Tum the timing knob to select the desired sta.
tion. Operate the tuning knob so that the signal
moter pointer deflects toward the fay right and
also the tuning meter will indicate the eenter of
the scale, with the FM-tune indicator light up as
shown in Figs. 6,7.
When a stereo program is being received, the
stereo indicator comes on; if a monaural
program is being received, this indicator will
remain off.
6. Take your hand eff the tuning knob; then, the
PM locked indicator will light, indicating that
the tuner frequency has been locked to the FM
station transmitting frequency.
Nore:
When touching the tuning knob, do not touch the froat
panel or tuner body with your other hand. If you touch
tke front panel or tener body with your other hand, the
touch tune lock system may malfunction.
© If a comparatively high frequency noise is
noticed during the reception of stereo program,
depress the MPX noise filter switch setting it-to
the ON position.
© If accurate tuning cannot be obtained even
‘though the signal meter is deflecting, set the FM
muting/mode switch to OFF, and begin the
tuning process again.
AM RECEPTION
1. Set the power swiich to ON.
Sel the function switch to AM.
3, Set the PM-AM LF band switeh at NARROW. If,
the desired station can he received clearly with
‘out adjacent channel interference, set thie switch
to WIDE after selection.
Por further details regarding this operation, rofer
to “PM-AM IF band switch” on page 8.
4, Select the desired station by adjusting the tuning
knob.
‘The signal meter pointer will strongly deflect to-
ward the right when securate tuning is obtained
as shown in Fig. 8

ACCESSORY FUNCTIONS
EM MUTING/MODE SWITCH
This switch is used to eliminate unpleasant intor
station noise which occurs during sclection of FM
broedeasting stations. The muting circuit sup-
prestes this noise, and makes FM selection easier.
© In the areas where the distance from the HM
station is comparatively small, set. this switch to
ON.
© In the areas where the field strength is very
weak, set this switch to OFF during selection.
A distant, weak station can be received even
‘though the noise becomes greater.
© If recording of a stereo FM program onto mo-
aural tape is desired, set this switch to MONO.
roa
FM/AM IF BAND SWITCH
‘The FM/AM IF band switch is used to switeh the
intermediate frequency signal pass band width of
FM and AM between NARROW (narrow band) and
WIDE (wide band). If there is a station close to the
desired station, set this switch to NARROW; the
selectivity will become sharp, and interference will
be avoided. On the other hand, if there is not a
station close nearby, act this switch to WIDE; the
sound quality of the received program will be
improved, Further, the behavior of the signal meter
pointer varies according to the switch position;
WIDE or NARROW. When set to WIDE, the width
of the tuning point is comparatively large, and the
pointer moves slowly. At NARROW position, the
pointer moves sharply as the width of the tuning,
point is very narrow.
OUTPUT LEVEL KNOB
‘The Tuner is provided with variable output jacks
whose output level ean be varied by adjusting the
output level knob on the front panel, and also
fixed output jacks whose output level is fixed,
Using the VARIABLE jacks
‘The output level can be adjusted using the output
level knob, thereby making it possible to bring the
output levels of the Tuner and of the other com:
ponents connected to the stereo amplifier in line
with each other.
Fig. 9
FM-DOLBY RECEPTION
Tuner Fw
enone witch
a
ele
\ ahsks
creo © ®
a
Go Osu
Stor spin
258
[Bioro0%000]] — Loerion
are
REG]
—TAPEPCAY
uineinmur] Live ourrur
300
te "
Dalby NA adenor
Fig. 10
The FM de-emphasis switch is provided to allow
reception of FM-Dolby broadcasts in locations
where these programs are being transmitted. A
separately sold adaptor must be connected to the
stereo amplifier in this ease, then proceed accord
Ing to the following steps:
LAs shown in Fig. 10, connect the Dolby NR.
adaptor lo the tape (record & play) jacks of the
stereo amplifier
2. Set the rear panel FM de-emphasis switeh to
2Bus.
3. Sot the tape monitor switch of the stereo ampli
fier to ON.
4, Set the function switch to the FM position
and use the tuning knob to tune in to an FNL
Dolby broadcast. Tuning is performed in the
same manner as described in “LISTENING TO
BROADCASTS.”
5. Operate the adaptor and set for reception,
Adjust the volume and tone with the controls of
the stereo amplifier,
NoTES:
Refer to the Dolby NR adaptor operating instructions
rewarding connection and operation,
+ When not listening to FM-Dolby broadest, be sure to
set the FM de-emphasis witeh to 75us

It is necessary to choose the installation location
for the FM antenna prudently so that you will be
able to receive WM stereo broadcasts with both
optimum stability and sound quality.
Bear in mind the items below, and then find the
best location (height and direction),
1. The ideal place for the antenna is somewhere
where it will pick up the signals directly from
the transmitting antenna of the FM broadcasting
station.
If
you
install
the
antenna
between
high-
rise
blocks
or
on
the
other
side
of
buildings
or
similar obstacles where it will not be able to pick
up
the
signals
directly,
you
will
find
that
multi-
path
distortion
is
caused
by
the
effects
of
the
reflected
radio
waves
bouncing
off
those
obsta
eles.
This
means
that
the
channel
separation
is
sometimes impaired.
Refer to the sections on page 10 on “EM
MULTIPATH DISTORTION” and choose a
height and direction for the antenna where the
effects of multipath distortion are minimal,
2. Install your antenna as far away as possible from
roads
and
highways
so”
the
ignition
noise
of
automobiles will not interfere with reception,
Also,
set
your
antenna
at
a
distance
from
high
tension power transmission lines and neon signs.
3.
Install
the
antenna
at
a
distance
of
not
less
than
2
meters
from
a
metal
roof,
concrete
buildings,
and
TV
antennas.
INSTALLING
THE
FM
ANTENNA
PIONEER
FM MULTIPATH DISTORTION
Multipath distortion occurs when FM signals are
reflected by mountains, buildings and other obs-
tacles lying in the path of the signals and enter
the antenna from various directions, as shown in
the accompanying figure. Due to the different
distances travelled by the reflected signals, the
slight time difference with which they strike the
antenna causes mutual interference. ‘This resulis in
phase
distortion,
distortion
of
the
received
sound,
reduced channel separation, and a downgraded
signal-to-noise ratio. The tuner is liable to be
affected by this phenomenon when the radio waves
are weak
a3 (RL eaten
mn
WS
rin
Pig. 11
;
USING
THE
TOUCH
SENSOR
SENSITIVITY
SELECTOR
FOR FM TUNING
‘The touch tuning sensor used with this model
works
with
the
induetive
hum
from
the
body,
Depending on the ambient conditions during
operation, however, the touch sensitivity may
undergo great change
‘To compensate for this, the rear panel of the
model is equipped with @ touch sensor sensi-
tivity selector switeh, Whea the model is shipp-
ced, this switeh is set to the LOW position for use
under nonmel conditions, However, if for some
reason, the inductive hum from the body is at a
low
level,
the
PM-tune
indicator
may
not
come
on and the PMdocked indicator will light up
ireetly even when a program is being received
In casos like thia, sot the selector switch to the
HIGH position,
aaa
Touch sonsar sensitivity selector

FM MULTIPATH DISTORTION
Just
like
when
ezecting
an
FM
antenna,
it
is
very
difficult
to
choose
the
right
direction
for
optimum
reception
by
yourself,
Get
somebody
to
give
you
hand
and
perform
the
following
adjustments.
Adjustments when using a stereo amplifier
1. As shown, in Fig. 12, connect “H” (Horizontal)
multipath output jack of the tuner to the AUX
input L (left) channel jack of the stereo ampli-
fior, and “V" (Vertical) multipath output jack
to the AUX input R (right) channel jack
2.Set the funetion switch to AUX of the stereo
‘amplifier.
Turn down the volume of both stereo amplifier
channels and tune into an FM station, Next,
increase the volume a little at a time. Through
the left channel will be heard the sound of
signals with an accentuated treble, while through
the right channel will bo heard the multipath
distortion noise (AM components formed by the
reflected redio waves).
4. Tum down the sound of the left channel using
the stereo amplifier’s balance control, and adjust
the direction of the antenna so that the multi-
path distortion is reduced to the minimum, all
the while listening to the sound through the
right channel
Adjustments when using an oscilloscope
1, As shown in Fig. 18, connect the Hi (horiz)
‘multipath ouput jack al the rear of the tuner to
the horiz axis input jack on the oscilloscope and
the V (vert) multipath output jack to the vert
axis input jack with good quality shielded wires.
2.'Tune
into
an
FM
station
so
that
the
tuner
i
perfectly tuned.
8. Adjust the oscilloscope controls and observe the
‘wave-forms,
4.The multipath waveforms appoar in a number
of differing patierns in accordance with the
height and direction of the antenna and with the
strength of the radio waves. In addition, they are
undergoing variations al) the time due to the
strength of the audio signals, The wave-forms
illustrated in Photo A of Fig. 14 are an example
of what you can expect (o observe when the
multipath distortion is relatively high. In order
i reduce the multipath distortion, adjust the
height and direction of the antenna so that the
patterns become linear (sco Photo B of Fig, 14).
MULTIPATH ourpus jacks AUX wputjecis
siere0
en ‘Gam.
thenanetand spesker
The malpeth ditortion an be Nead throug
Fig. 12
=. Om
y Verte
gap
MOCTIBATH octpot le
|
Fig. 18
Photo A: « high levolof maith divtontion
Phote 8: no suhipath distortion