Simrad AC12 Manual de usuario descargar pdf (Pagina 4)

P874E

The bandwidths correspond to the two different

transmitter TVG-switch S501 should

be in positionIY"--=J

navigation.

pulse lengths (0.

3 and 1.

3 ms) and are 3 and 1 kHz

, respect-

Detector 1 also has an input from 0704

, a circuit suppress-

ively. The I F-signalis applied to amplifier 0604-

605 and

ing the transmitter pulse. The suppression period is

deter-

brought out to pinP701-

6 at the BOTTOM DETECTO

R pcb.! mined by the duration of the pulse obtained from the

The IF-signal is returned to

amplifier 0606-

607 through

! TRANSMITTER PULSE SUPPRESSOR

MUL

TIVIBRATOR

the gain control R 101

, and appl ied to the R

ECO R D E R

! 0717-718. The pulse duration is adjusted to 1.

0 ms for the

DRIVER 0610. This

stage has three other inputs

, control

I shallow range and will be approx. 3 ms for the deep

range.

signal for contourline via.pin P601-

6, an INHIBIT signal

, The output of the TRANSMITTER

PULSE SUPPRESSOR

from 0613-

614 that will. block the DR I VE R STAG E when

fVlY appl ied to

pin P601-

11 of the I F-filter pcb

, causes the

terminal E1 01-

17 is grounded, and finally a marker

signal

marker oscillator to produce transmitter pulse marks of 1.

from the MARKER OSCILLATOR 0611-

612. The latter is

ms and 4 ms duration respectively. The same output also

controlled from the

BOTTOM DETECTOR pcb via pin

controls the signal gate 0601-

602 so that no

signals are let

P601-

11. The marker oscillator produces a pulse to compen-

through this gate during the same

periods.

sate for the transmitter pulse that was blocked by the

signal

gate 0601~

602. Thus an even transmitter-

pulse mark with

constant width is obtained on the recording paper. The

MARKER OSCI LLATOR may also be controlled manually

by marker push button switch S103 for producing a black

line across the entire recording paper when events of interest

are to be distinguished. Also external equipment may control

the MARKER OSCILLATOR when connected to terminal

E101-

, denoted MARKER.

When the NORMAL/CONTOURLINE switch S702 is placed

in positionDnormal

, the echo signal passes through the

I F- FI L TER

pcb unaffected by the BOTTOM DETECTOR

pcb. However

, when placed in positionDcontour-

line, the

CONTOUR MV 0707-

709 will cause all signals received

after the seabed echoes to be completely blocked in the

receiver

, thus Qbtaining a distinct bottom

contour recording

on the echogram.

The FUNCTION SWITCH S701

, which in the Navigation

Sounder is placed in position I

, routes the bottom echo pulse

to the CONTOUR LI NE TRIGGER

0715 whichtriggers

the CONTOURLINE MV 0707-

709 mentioned above.

2.4 BOTTOM DETECTOR printed-circuit board 514-

187

This board has two bottom

detector circuits of which only

The output of the TVG MUL TIVIBRATOR 0512-

513 on

DETECTOR

1 (0703, 705-

706) is utilized in the EN Echo

the TVG RECEIVER pcb is applied to the contour-

line trig-

Sounder.

ger 0715 via pin P7O1-

, blocking 0715 during a short

per-

Detector 1

receives its input from the first amplifier stage

iod immediately,

after the transmitter pulse

(approx. 7 ms

0604-

605 of the IF-

FILTER pcb via P601-

, P701-

6 and

equivalent to a depth of 5 m). Working

as a bistable multi-

amplifier stage 0701-

702 of the BOTTOM DETECTOR pcb. vibrator

, the contour-

line MV is also triggered by the

This signal is not affected by the gain

control R1 01. The

TRANSMITTER MV. AMPL. 0716 at the start of the

trans-

outputof

DETECTOR

1 is a bottom pulse independent of

mitter pulse. 0716

isolates the bottom-

detecting circuits

the setting of the gain control which may be used as

a bottom from the transmitter multivibrator 0409-410

on the

signal for external analog or digital depth indicator

, connec-

TRANSMITTER pcb. It also triggers the TVG multivibrator

ted to terminal E101-

18 denoted BOTTOM PULSE

1. The 0512-

513 of the TVG RECEIVER pcb

via pin P501-

TRANSMITTER PCB 514-

168

TERMINAL STRIP E101

IF-

FILTER PCB 514-

186

TVG RECEIVER PCB 514-

171

BOTTOM DETECTOR PCB 514-

187

Cabinet

Brackets for cover

Electronic unit chassis

Figure

Electronic unit identification

1 2 3 4 5 6 7 8 9 ... 43 44

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