Sharp rg f 871 g service manual

Page 2

1. GENERAL DESCRIPTION OF RDS
AND ITS PURPOSE

. FIDS is an abbreviation otFladio. Data System. I .This system . ,, Below described are types of~linformation obtained

. is designed to fDacilitate tuning and supply with programme

- information using inaudible subcarriers (57 kHz) without
interfering with the existing stereophonic and monophonic
programmes within the frequency range from 87. 5 to 108.0
MHz. It covers the' ARI system adopted, at pre
Germany, etc.

.1

The information of the system consists of digital signals. These .
signals are D/A-converted, amplitude- modulated, and then FM--

modulated together with regular sighals after that the signals
are sent from the broadcasting station.

The data signals are carried on a subcarrier, which is added
to the stereo multiplex signal (or monophonic signal) at the
input of the VHF/FM Transmitter. The frequency chosen for
the subcarrier will- be 57 kHz j; 6 Hz - exactly three times the
19 kHz pilcttone in case of stereo phonic broadcasting, and
locked to it in phase (Fig. 2-1).

The receiver demodulates them to digital signals, and using
these signals, assists the listener to tune and supplies him
(her) with programme information. 7

Why was RDS developed? The reasons are as follows.

At present in Europe there are so many broadcasting stations
(transmitting stations) that the listener cannot find the desir-
able station or programme. Especially, the user of car-
mounted radioreceiver has to tune whenever the receiving area
changes. This causes troubles and danger to the drivers.

RDS can solve this problem. It has been developed to facilitate
tuning to any desired station (programme) so that he (she) can
listen to the programme as long as possible.

Accordingly, the receiver is provided with an auto- -tuning
function and a station name and programme indicating
function.

dBm .

+10- M SIGNALILaiR)

tin West ,I: as follows. 7:.

I

2. TYPES OF INFORMATION GIVEN
BY RDS

om
data signals of FIDS and features of the receiver using this
information.

Available are 14 types of FIDS information, PI, PS, AF, ON, CT,
TP, TA, PTY, DI M/S, PIN, RT TDC, and IH. Their details are

(1) Pl (Programme Identification code)

1-11 I This code identifies country, area coverage and ref. No.

of the broadcasting station.» To distinguish from other

5 r stations, one code is allocated to one station. If a tuned

programme cannot be received clearly, the receiver,
applying this information, searches automatically the
station having the same PI code, namely the station
sending the same programme with another frequency.

(2) PS (Programme Service name)
The network name of the received station is indicated on
the display. This code Is a text consisting of up to 8 digits.
Ex. BBC_ R1, R. _WALES, SRG_ BERN I'

(3) AF (Alternative Frequencies list) ' ' '
This is a list showing the frequencies of the stations which
send the same programmes although these frequencies
differ from the currently tuned frequency.
If this list is stored in the receiver memory, the receiver can
choose automaticallydthe best transmitter for the station in
question.

(4) ON (Other Network Information)
This information provides information on other networks
while a programme of a network is received. The infor-
mation of other networks whichcan be obtained is PI, TP,
TA, PTY, AF and PIN.
Referringfto this information, you can switch the station
o'rtunelyagain to another station sending traffic announce-
ment.

(5) CT (Clock Time and Date) ' . . : \ *I I
This code informs the receiver of the accurate time and
date. The Greenwich Mean Time is sent to; the receiver.

7. The receiver converts: it to_the local time and shows the

year, month, day, hour, minute, day, and week.

(6) TP (Traffic-Programme Identification code)
This code indicates that the tuned station is sending traffic
information. It functions as the SK signal of ARI system.
This code shows that the tuned station is sending traffic
information on the display or LED an t es to the station
sending the traffic inforrn 3 ' .

S SIGNAL( L-R)

FIN-QT. ., ,' 1

-50 _

10 19 28

Figure'2-1'

38

II-2:. 7

9

®

- Resistor:

®

- Widerstande:

®

- Resistance:

To differentiate the units of resistors, such symbol as K is
used: the symbol K means 1000 ohm and the resistor
without any symbol is ohm-type resistor.

- Capacitor:

To indicate the unit of capacitor, a symbol P is used:
this symbol P means micro-micro-farad and the unit of
the capacitor without such a symbol is microfarad. As to
electrolytic capacitor, the expression "capacitance/withstand
voltage is used.

(CH), (TH), (RH), (UJ): Temperature compensation

(ML): Mylar type

(P.P.): Polypropylene type

Um die Einheiten der Widerstande unter-scheiden zu
konnen, werden Symbole wie K benutzt. Das Symbol
K bedeutet 1000 Ohm Bei Widerstanden ohne Symbol
handelt es sich um ohmsche Widerstande.

- Kondensatoren:

Zum Bezeichnen der Kondensatoreinheit wird das Symbol
P benutzt; dieses Symbol P bedeutet Nanofard. Die Einheit
eines Kondensators ohne Symbol ist Mikrofarad. Fur
Elektrolytkondensatoren wird die Be-zeichnungz 'Kapazitat/ .
Stehspannung" b'enutzt

(CH), (TH) (RH), (UJ): Temperaturkompensation _. ' :;/
(ML): Mylarkondensator

(P.P): Polypropylentyp

Pour differencier les unites de resistances, on utilise des
symbole tels que K: le symbole K signifie 1000 ohms et la
resistance donnee sans symbole est une resistance de type
ohm.

- Condensateur:

Pour indiquer lunite de condensateur, on utilise le symbole
P; ce symbole P signifie micro-microfarad, et lunite de
condensateur donnee sans ce symbole est le microfarad.
En ce qui concerne Ie condensateur électrolytique, on
utilise Iexpression tension de regime/capacite

(CH), (TH), (RH), (UJ): Compensation de temperature

(ML): Condensateur Mylar

(P.P): Type Polypropylene

_59._.

RDS

NOTES ON SCHEMATIC DIAGRAM

- The indicated voltage in each section is the one measured by

Digital Multimeter between such a section and the chassis
with no signal given.

~ Schematic diagram and Wiring Side of P.W.Board for this

model are subject to change for improvement without prior
notice.

ANMERKUNGEN ZUM SCHEMATISCHEN SCHALTPLAN

- Die in den einzelnen Teilen angegebenen Spannungen

werden mit einem DigitalvielfachmeBgerat zwischen dem
betreffen den Teil und dem Chassis ohne Signalzuleitung
gemessen.

- Anderungen des schematischen Schaltplans und der

Verdrahtungsseite der Leiterplatte fLIr dieses Modell im
Sinne von Verbesserungen jederzeit vorbehalten.

REMAROUES CONCERNANT LE DIAGRAMME SCHEMATIOUE

La tension indiquée dans chaque section est celle mesurée

par un multimétre numerique entre la section an question
et Ie chassis, en labsence de tout signal.

- Le diagramme schematque et le cOte cablage de [a PMI

de ce modele sont sujets a modifications sans preavis pour
lamélioration de ce produit.