Simrad AC12 Bedienungsanleitung PDF herunterladen (Seite 3)

Co nstructio n

The SIMRAD EN Navigation Sounder comprises as follows:

- splash-

proof cabinet which houses the transmitter-receiver

, 2.2 TVG RECEIVER printed circuit board 514-

171

the power unit and the dry-

paper recorder unit

The signals from the

in/outtranstormer are

applied to the

transducer in steeltank

TRANSMITTER PULSE SUPPRESSOR 0501

, a field-effect

watertight junction box for transducer cable extension

transistor (FET) which

suppr~sses the receiver signals arriv-

and

, "

ing after the transmitter

pulse. A total suppression of the

if required, selector for the combinations one cabinet/two

transmitter pulse itself is not

possible but signals following

transducers

, two cabinets/two transducers or two cabinets/immediately after are suppressed

, such as ringing signals and

one transducer.

reverberation. Thus a distinctive transmitter-

pulse mark is

obtained on the recording paper

, allowing bottom registrat-

ion at shallow waters.

SUPPR ESSO R 0501

is controlled by

0511

, a gate controlled by the

BOTTOM DETECTOR via

pin P501-

3. The signals are amplified in receiver preamplifier

(I NPUT AMPL.) 0502-

504 and applied to the timevariable

gain amplifier (TVG-AMPL.) 0505-

508. The amplification

is governed by a control voitage supplied to the VDR

resis-

tors by theTVG-VOL TAGE GENERATOR 0514-

516.

P874E,

1. INTRODUCTION

General

This publication is intended for the

service engineers and

contains a circuit description

, service instruction, list of

electrical parts

detaiJed circuit diagrams and mechanical

parts drawings; With the equipment is included-one copy

each of the Operator

s Manual:P872E and the Installation

ManualP873E.

Technical'

Data

Refer to the Operator

s Manual and/or the Installation

Manual. "

Two types of transducers are recommended:

- 20x20o(10x10cm radiating

face) type65H or

- 20x

100 (1 Ox20 cm radiating face)

type 65J

If connected to the SIMRAD IC Depth Indicator, the

20x 1 00

transducer is util ized.

SI M RADEN is delivered with scale in metres

(O~50/o.500)

or in fathoms (0.30/0 -

300).

For details regarding 110/220V ac mains wiring, refer to the

nstallation Manual.

2. BLOCK DIAGRAl'vl AI"JAL

YSIS

equivalent to that of the transmitter pulse. This output is

applied to terminal P701-

3 of the BOTTOM DETECTO

pcb and to terminal E 101-

11 'of the terminal board (denoted

TRIGGER OUT). The output'

at terminal E101-

9 may be

, employed

fortrigging: an external transmitter.

When no such

external equipment

is' used, the output is returned to the

transmitter pcb via a

: strap ana applied to the

various trans-

mitter stages: oscillator gate: (0408),

oscillator (0407), driver

(0403-

406) and output amplifier '

(0401-

402). Final output

signals for the transducer

are obtained from the in/out trans-

formerT401 through terminals E101-

, - , -

4. Returning

echo signals are brought to

the receiver terminals E101-

and E1 01-

8. The strap across these terminals must be remo-

ved when external transmitter is

used (connected to terminal

E101-

8).

The voltage generator is controlled by the TVG

MUL TIVI-

BRATOR 0512-

513, which is triggered from the BOTTOM

DETECTOR via pinP501'-7. Switch S501 selects between

a TVG function suitable for navigation purposes

, and another

intended for fishfinding. SIM

RAD EN uses the navigation

function

I :-

-:::J

, which is unaffected by the TVG control

R562. The TVG amplified

signals are brought out to pin

P501-

6 and applied to the I F-

FI L TER

pcb. The LOCAL

OSCILLATOR is also located on the TVG RECEIVER pcb.

Its signal is appl ied to

the I

F- F I L TE R

pcb through pi

n P501-

1 TRANSMITTER printed circuit board 514-

168

The TRANSMITTER MUL TIVIBRATOR (comprising tran-

sistors 0409-410) has two trigger inputs. If it is desirable

, 2.

3IF-FIL TER printed circuit board 514-

186

to control the transmitter by external equipment,

trigger

The TVG-AMPLIFIER signals are applied to the SIGNAL

input E101-19 (denoted TRIGGER IN) of the terminal strip

GATE 0601":602 via pin 601-

2, the function of which is to

may be used. Trigger signals from the reed

contacts of the

prevent the transmitter

pulse from reaching the BANDPASS

recorder are applied to the multivibrator through pin P401-

circuit, so as to ensure ,

a distinctive transmitter pulse mark

on the transmitter pcb. The pulse duration of the multivibra- i

on the recording paper. The SIGNAL GATE is controlled

tor is

governed by a voltage

appliedto pin P401-

, which is

the TRANSMITTER PULSE

SUPPRESSOR 0717-

718 of

supplied either from the RANGE

SELECTOR or from the

' BOTTOMDETECTOR pcb. Signals passing

through the

external equipment connected to terminaLE101-20. Thus

gate are m

ixed with the 102 kHz LOCAL OSCILLATOR

it is possible to control

the transmitter'

externally.

signal in the MIXER stage06Q3

, the IF-signal obtained

having a frequency of 64kHz (the

difference between the

The TRANSMITTER MUL TIVIBRATOR has two' outputs,

receiver/transmitter frequency and that of the

LOCAL

one of which is applied to the preceeding transmitter circuits

OSCI LLA TOR). The bandwidth of

the I F-

filter is deter-

(0401-

408) via terminals E101-9 and E101-

10 on the term i- mined by an LC circuit comprising L601

, T601 and C603-

nal strip. The other 0utput is

a positive pulse with a duration

- and is controlled by the RANGE SELECTOR S105.

1 2 3 4 5 6 7 8 ... 43 44

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