IRT Communications RWT-3085 User manual

Brand: IRT Communications

Model: RWT-3085

Type: User manual

IRT Communications RWT-3085 is a wide band RF fiber optic link designed to transmit broadband RF signals from 20 MHz to 200 MHz along a single-mode optical fiber. It consists of two Eurocard modules: the RWT-3085 laser transmitter module and the RWR-3085 photo-diode receiver module. The system offers high carrier-to-noise ratio, low group delay, and supports optical signal levels up to -7 dBm. It features front panel indicators for power, low RF signal, and low optical power alarms, and provides external alarm connections for integration with monitoring systems.

3085-rwt & 3085-rwr.ib.doc Page 1 of 10 18-07-02

EUROCARD

WIDE BAND RF FIBRE OPTIC LINK

Type RWT-3085 / RWR-3085

Designed and manufactured in Australia

IRT can be found on the Internet at:

http://www.irtelectronics.com

Designed and manufactured in Australia

IRT can be found on the Internet at:

http://www.irtelectronics.com

Designed and manufactured in Australia

IRT can be found on the Internet at:

http://www.irtelectronics.com

I R T Electronics Pty Ltd A.B.N. 35 000 832 575

26 Hotham Parade, ARTARMON N.S.W. 2064 AUSTRALIA

National: Phone: (02) 9439 3744 Fax: (02) 9439 7439

International: +61 2 9439 3744 +61 2 9439 7439

Email: sales@irtelectronics.com

Web: www.irtelectronics.com

DANGER

Avoid direct exposure to beam

Peak power 1 mW

Wavelength 1300 nm

Invisible LASER radiation-

Class 1 LASER Product

IRT Communications

www.irtcommunications.com

3085-rwt & 3085-rwr.ib.doc Page 2 of 10 18-07-02

RWT-3085/RWR-3085

WIDE BAND

RF FIBRE OPTIC LINK

Instruction Manual

Table of Contents

Item Page

Operational Safety 2

Description 3

Specifications 4

Installation 5

RWT-3085 Laser transmitter module 5

RWR-3085 photo-diode receiver module 6

RWT-3085 Pre-set adjustments 6

RWR-3085 Pre-set adjustments 6

Front and rear layouts 7

ZWR-3085RH Change-over Rear Panel 8

Warranty & service 9

Equipment return 9

Drawing index 10

Operational Safety:

WARNING

Operation of electronic equipment involves the use of voltages and currents that may

be dangerous to human life. Note that under certain conditions dangerous potentials

may exist in some circuits when power controls are in the OFF position.

Maintenance personnel should observe all safety regulations.

Do not make any adjustments inside equipment with power ON unless proper

precautions are observed. All internal adjustments should only be made by suitably

qualified personnel. All operational adjustments are available externally without the

need for removing covers or use of extender cards.

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3085-rwt & 3085-rwr.ib.doc Page 3 of 10 18-07-02

Description

The IRT RWT-3085 / RWR-3085 wide band RF fibre optic link is a modular system for transmitting a broadband

RF signal ranging from 20 MHz to 200 MHz along a single mode optical fibre. A system consists of two IRT

Eurocard modules, the RWT-3085 LASER transmitter module and the RWR-3085 photo-diode receiver module.

RWT-3085 Laser transmitter.

As shown on diagram 803950 the RWT-3085 Laser Transmitter module consists of a 1300 nm wide bandwidth laser

diode, whose operating current is set by a driver circuit controlled by feedback from the monitoring diode in the laser

package. Wide band amplifiers are used to drive the laser with the RF signal applied to the module input.

The monitoring diode output is also connected to comparator circuits which are used to provide optical power

alarms. The low power alarm drives a LED indicator on the front panel, and after passing through a relay, is also

available as an external connection. The adjustment and connection data for this circuit is given in the installation

section of the manual.

The power supply comprises two bridge rectifiers whose rectified outputs are paralleled (positive and negative

respectively) to provide redundancy. The input to these rectifiers are two independent feeds of 28 Vac (centre tap

grounded). The rectified DC outputs are regulated by three-terminal regulators. The DC indicator LED on the front

panel is wired in series with a zener diode and a resistor between +12 and -12 Volts. The zener is to ensure that the

LED extinguishes if either of the power supplies fails.

RWR-3085 Photo-diode receiver.

As shown on diagram 803955 the RWR-3085 Photo-diode Receiver module consists of a 1300 nm optical detector

diode circuit with integral pre- amplifier followed by an attenuator circuit and signal output amplifier. An optical

input level indicator circuit is provided to indicate the loss of input signal to the module.

The optical detector circuit consists of a photo-diode, biased from a +6V supply, followed by an internal amplifier

operating from -5V. The output of the amplifier is connected to a FET amplifier whose gain is controlled by its bias

which is set by a front panel control. A further amplifier is used to bring the output level up to the level applied to the

input of the RWT-3085 Laser Transmitter.

The bias current to the photo-diode is a measure of the optical signal level received and this current is monitored by

a comparator circuit which provides an alarm when the signal drops below a preset threshold. The low signal alarm

circuit drives a LED indicator on the front panel, and after passing through a relay, is also available as an external

connection. The adjustment and connection data for this circuit is given in the installation section of the manual.

The power supply comprises two bridge rectifiers whose rectified outputs are paralleled (positive and negative

respectively) to provide redundancy. The input to these rectifiers are two independent feeds of 28 Vac (centre tap

grounded). The rectified DC outputs are regulated by three-terminal regulators. The DC indicator LED on the front

panel is wired in series with a zener diode and a resistor between +12 and –5.2 Volts. The zener is to ensure that the

LED extinguishes if either of the power supplies fails.

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3085-rwt & 3085-rwr.ib.doc Page 4 of 10 18-07-02

Specifications

RF signal level +5 dBm maximum

RF circuit input / output impedance 75 Ω

RF circuit input / output return loss >-20 dB 50 MHz to 200 MHz.

RF signal connections BNC on rear panel.

System frequency response ± 1.0 dB 30 MHz - 200 MHz

System group delay ± 2 ns 30 MHz - 200 MHz

System carrier to noise >100 dBc/Hz for 0 dBm RF signal 2 dB optical

path loss and better then 40 dB fibre return loss.

Optical signal 1300 nm, -7 dBm ±2 dB

Optical signal connections SC on module rear.

Maximum system optical loss 8 ±1 dB maximum.

Power requirement per unit 14V-0-14 Vac 4.5 VA

Operating temperature range 0 - 50° C ambient

Mechanical 6 HP x 3 U x 220 mm IRT Eurocard

Suitable for mounting in IRT 19" rack chassis types

FR-700 & FR-722 with fibre & RF connections on

the front panel and alarms on rear.

Finish: Front panel Grey powder coat, silk screened black lettering &

red IRT logo

Rear assembly Detachable silk screened PCB with direct mount

connectors to Eurocard and external signals

Standard accessories Matching control connectors are supplied with each

module

Operation manual

Optional accessories TME-6 module extender card

NOTE: All the parameters specified are only applicable when using single mode (9/125µm) fibre cable.

Due to our policy of continuing development these specifications are subject to change without notice.

IRT Communications

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3085-rwt & 3085-rwr.ib.doc Page 5 of 10 18-07-02

Installation

Pre-installation:

Handling:

This equipment may contain or be connected to static sensitive devices and proper static free handling precautions

should be observed.

Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures

should be followed when inserting or removing cards from these bags.

Power:

AC mains supply: Ensure that operating voltage of unit and local supply voltage match and that correct rating fuse

is installed for local supply.

DC supply: Ensure that the correct polarity is observed and that DC supply voltage is maintained within the

operating range specified.

Earthing:

The earth path is dependent on the type of frame selected. In every case particular care should be taken to ensure that

the frame is connected to earth for safety reasons. See frame manual for details.

Signal earth: For safety reasons a connection is made between signal earth and chassis earth. No attempt should be

made to break this connection.

Installation in frame or chassis:

See details in separate manual for selected frame type.

RWT-3085 LASER transmitter module

The RWT-3085 is factory aligned for an optical output level of -9 dBm to -7 dBm and an optimum RF input level of

0 dBm into 75 Ohms.

Installation requires the unit to be plugged into the front of the mounting frame and the rear assembly to be secured

to the rear panel of the mounting frame, to install a module in the frame please see instructions under selected frame

type in the relevant manual describing the frames.

RF signal connection is made to the BNC connector on the rear panel of the RWT-3085.

Optical signal connection is made to the optical connector on the rear of the RWT-3085. Extreme care must be

taken to ensure the cleanliness and consequently the best return loss of the optical connections.

The RF input signal sensitivity is set by a 75 Ohm to 50 Ohm matching pad consisting of R 1, R 2 and R 3. The

attenuation of the pad is 15 dB. This pad can be changed to a minimum of 6 dB to increase the sensitivity of the RF

input circuit of the RWT-3085.

DANGER

Avoid direct exposure to beam

Peak power 1 mW

Wavelength 1300 nm

Invisible LASER radiation-

Class 1 LASER Product

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3085-rwt & 3085-rwr.ib.doc Page 6 of 10 18-07-02

NOTE: This means that increased signal level at the input may overload the system, great care must be taken if the

input sensitivity of the RWT-3085 is changed. Only contemplate changing the system operating levels if the noise

floor becomes a problem when operating at low RF levels.

The optical output power is monitored by comparator circuits which are adjusted to change state if the output power

falls by 6 dB.

The external connections for the alarm circuit is available on pins 3 and 4 of SK 1 on the rear panel. Pin 3 is the

ground connection and pin 4 is the active connection from the alarm circuit. The alarm circuit output is a relay

contact set which is linked to provide a contact closure or a contact open when a fault occurs. To select the

contact closure on fault set the link near RL 1 in the NC position.

RWR-3085 photo-diode receiver module

The RWR-3085 is factory preset to give unity gain in the RF signal path with 3 dB attenuation in the optical path.

Installation requires the unit to be plugged into the front of the mounting frame and the rear assembly to be secured

to the rear panel of the mounting frame, to install a module in the frame please see instructions under selected frame

type in the relevant sections describing the frames.

RF signal connection is made to the BNC connector on the rear panel of the RWR-3085.

Optical signal connection is made to the optical connector on the rear of the RWR-3085. Extreme care must be

taken to ensure the cleanliness and consequently the best return loss of the optical connections.

The external connections for the alarm circuit is available on pins 1 and 2 of SK 1 on the rear panel. Pin 1 is the

ground connection and pin 2 is the active connection from the alarm circuit. The alarm circuit output is a relay

contact set which is linked to provide a contact closure or a contact open when a fault occurs. To select the

contact closure on fault set LK 8 near RL 1 in the NC position, i.e. 1-2.

To compensate for the optical path loss the RF signal level can be set using the gain control (RV 1). RV 1 is a

multiturn potentiometer accessible through a hole on the front panel, positioned above the BNC RF output

connector.

The optical input level is monitored by a comparator circuit which is adjusted to change state if the optical input

level falls below -15 dBm.

This alarm circuit is connected to pins 1 and 2 of SK 1 on the rear panel. Pin 1 is the ground connection and pin 2 is

the active connection from the alarm circuit. The alarm circuit output is a relay contact set which is linked to

provide a contact closure or a contact open when a fault occurs. To select the contact closure on fault set LK 8

near RL 1 in the NC position, i.e. 1-2.

RWT-3085 Preset adjustments.

RV 2 sets the bias current to the laser diode and thus the optical output from the RWT-3085. Adjustment of

RV 2 without monitoring the optical output power and the laser operating linearity will cause misalignment of

the RWT-3085 and may cause the system to fail. RV 2 has been factory set for correct operation and should

not be adjusted without consulting the manufacturer.

RV 3 is sets an output on indication.

RV 4 sets the output LOW indicator circuit as shown by LD 2 on the front panel and the state of the alarm

circuit. U 5.

RWR-3085 Preset adjustments.

RV 5 sets the output LOW indicator circuit as shown by LD 1 on the front panel, and the state of the alarm

circuit.

Diagrams are provided giving details of the power supply and alarm circuits of the RWT-3085 and the RWR-3085.

The optical and RF signal sections are housed in sealed shielded sections containing no user serviceable parts.

Should service be required on these circuits, please return the unit to the supplier for repair and alignment.

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3085-rwt & 3085-rwr.ib.doc Page 7 of 10 18-07-02

Front & rear panel connector diagrams

The following front panel and rear assembly drawings are not to scale and are intended to show connection order and

approximate layout only.

LASER ON

LOW

RWT-3085

N140

CAUTION

Direct

connections

to module

INPUT

LOW

GAIN

RWR-3085

N140

CAUTION

Direct

connections

to module

R-3085

SK1

OUT

OPTICAL

T-3085

SK1

OPTICAL

OUT

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3085-rwt & 3085-rwr.ib.doc Page 8 of 10 18-07-02

ZWR-3085RH Change-over Rear Panel

Two RWR-3085 receivers can be operated in a Main/Standby change-over situation for failure of a path using the

change-over rear assembly, ZWR-3085RH. This is a double width rear assembly, which takes two RWR-3085

receiver modules side by side. One acts as the Main receiver and the other as the Standby receiver. Should the Main

receiver circuit lose its input signal, a relay on the ZWR-3085RH board swaps the output connection with the

Standby receiver module.

For operation of two receivers in the Main/Standby mode the following connections must be made:

(Refer drawings 803955 and 804298)

1. In the RWR-3085 modules, LK6 must be placed in position 1-2. This will provide a closure to ground at SK4 on

the ZWR-3085RH rear connector when signal is present.

2. In the RWR-3085 modules LK1 must be closed. This will provide the +ve voltage for the relay on the rear

assembly.

3. The relay on the rear assembly connects the output of the Main module to the O/P 1 connector, SK1, in the

energised condition. At the same time the output of the Standby receiver will be connected to the O/P 2

connector, SK 2. On change-over these signal connections will swap. Wiring SK3 PIN 2 to SK4 PIN 3 will

complete the circuit so that O/P 1 is the main output and on failure the relay will release and switch to the output

from the Standby module.

4. An alarm can only be obtained from the RWR-3085 when LK2 is in the "AGC" position, pin 2 - pin 3. Thus an

RWR-3085 will give an alarm on loss of "RF Signal" at the receiver and the required "RF Signal Level" must be

set by RV2. The factory preset is for an "RF Signal Level" at the output of -10 dBm when the RWR-3086 is

operated in the "AGC" mode.

O/P 1

R-

-3

O/P 2

SK2

SK1

SK4

SK3

RL1

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3085-rwt & 3085-rwr.ib.doc Page 9 of 10 18-07-02

Maintenance & storage

Maintenance:

No regular maintenance is required.

Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind.

This is especially important in fibre optic equipment where cleanliness of optical connections is critical to

performance.

Storage:

If the equipment is not to be used for an extended period, it is recommended the whole unit be placed in a sealed

plastic bag to prevent dust contamination. In areas of high humidity a suitably sized bag of silica gel should be

included to deter corrosion.

Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures

should be followed when inserting or removing cards from these bags.

Warranty & service

Equipment is covered by a limited warranty period of three years from date of first delivery unless contrary

conditions apply under a particular contract of supply. For situations when “No Fault Found” for repairs, a

minimum charge of $A100.00 will apply, whether the equipment is within the warranty period or not.

Equipment warranty is limited to faults attributable to defects in original design or manufacture. Warranty on

components shall be extended by IRT only to the extent obtainable from the component supplier.

Equipment return:

Before arranging service ensure that the fault is in the unit to be serviced and not in associated equipment. If

possible, confirm this by substitution.

Before returning equipment contact should be made with IRT or your local agent to determine whether the

equipment can be serviced in the field or should be returned for repair.

The equipment should be properly packed for return observing antistatic procedures.

The following information should accompany the unit to be returned:

1. A fault report should be included indicating the nature of the fault

2. The operating conditions under which the fault initially occurred.

3. Any additional information which may be of assistance in fault location and remedy.

4. A contact name and telephone and fax numbers.

5. Details of payment method for items not covered by warranty.

6. Full return address.

7. For situations when “No Fault Found” for repairs, a minimum charge of $A100.00 will apply, whether

the equipment is within the warranty period or not.

Please note that all freight charges are the responsibility of the customer.

The equipment should be returned to the agent who originally supplied the equipment or, where this is not

possible, to IRT direct as follows.

Equipment Service

IRT Electronics Pty Ltd

26 Hotham Parade

ARTARMON

N.S.W. 2064

AUSTRALIA

Phone: 61 2 9439 3744 Fax: 61 2 9439 7439

Email: serv[email protected]

IRT Communications

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3085-rwt & 3085-rwr.ib.doc Page 10 of 10 18-07-02

Drawing Index

Drawing # Sheet # Description

803950 1 RWT-3085 / RWR-3085 optical link block diagram

803950 2 RWT-3085 optical transmitter schematic diagram

803955 1 RWR-3085 optical receiver schematic diagram

803955 2 RWR-3085 optical receiver schematic diagram

804298 1 ZWR-3085/6RH C/O Rear Panel for RWR3085/6

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TITLE

SCALE

SIZE

SHEET

DRAWN

CHECKED

ENG. APP.

CONTRACT No.

DO NOT COPY NOR

DISCLOSE TO ANY

THIRD PARTY

WITHOUT WRITTEN

CONSENT

OF14

IRT Electronics Pty. Ltd.

DRAWING No.

ARTARMON NSW AUSTRALIA 2064

A3 OPTICAL LINK

PSU

LASER

CURRENT

AMP LASER

POWER

ALARM

K.N.

803950

RF IN

ATTEN AMP

DETECTOR

GAIN SET

RF OUT

LEVEL

ALARM

OPTICAL

PSU

AC 14V

AC CT

AC 14V

ALARM

AC 14V

AC CT

AC 14V

-7V -8V-12V +12V -5V +8V-12V +12V

C.N.

70 & 140 MHz IF

RWT/RWR-3085

2 12/01/99

1 16/12/96

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CHECKED

ENG. APP.

CONTRACT No.

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CONSENT

OF2

IRT Electronics Pty. Ltd.

DRAWING No.

ARTARMON NSW AUSTRALIA 2064

+12V

-12V -7V

19b

-12v

18a,b

K.N. PCB ASSEMBLY

21a,b

22a,b

23a,b

24a,b

25a,b

26a,b

+12V

-12V

+12V

-12V

+12V

-12V

+12V

28b

29a,b

30a,b

+12V

803950

WB LASER MODULE

RWT-3085

9a,b

NOTE: UNLESS OTHERWISE MARKED DIODES ARE BAS32

+12V

SET LK6 AS REQUIRED

27a,b

31a,b

32a,b

(P1-J1/RA)

20a,b

7a,b

1a,b

6a,b

NOT ENERGISED = ALARM)

(AS SHOWN RELAY

PCB 804219

28a

1 16/12/96

2 12/01/99

RF THRO

REAR ASSY

R11

100K

TIP-32

RV2

500

R13

330

C12

10u

C18

100nF

C16

1uF

C17 1uF

RV4

500

Adj

LM317T

Adj

LM337T

R12

1K5

R25

27K

RV3

500

4R7

10nF

66R5

10n

4u7

1uF

10nF

C10

10nF

C11

10nF

C13

10nF

C19

10uF

R20

100

R21

R22

82R

C22

10nF

R19

4K7

R18

4K7

LM311M

C47

10nF

D1-4

1N4004

D5-8

1N4004

C39

1uF

R38

240

R37

2K05

R40

240

R39

2K05

D11

BZX84

C8V2

C14

10uF R15

1K8

R14

330

U3B

LM358M

8 4

U3A

LM358M

BC846

C24

10nF

C25

10uF

R23

180

C26

1uF

R24

Adj 4

LM337LM

C27

10uF

C30

10nF

R26

27K

R33

2K2

R32

2K2

C34

10nF

C33

10nF

LD1

GRN

RL1

FBR22

C36

10nF

2 1

D19

BAS32

4u7

C46

10uF

JP1

0R0

LD3

GRN

R36

C9 10n

C31

10nF

C35

10uF

C32

10nF

1 3

BZX84

C15

C44

1uF

1 3

D10

BAT54

JP2

0R0

C20

100nF

C23

10nF

R34

R35

R17

4K7

R16

4K7

LD2

RED

R10

10K

3 2

BC856

R31

10K

C40

1uF

C41

1uF

C42

1uF

LASER

FLD3C5LK

C29

10nF

R30

10nF

C28

10nF

R29

FL1

FL2

FL3

FL4

SK1/RA

J2/RA

C48

10nF

4u7

LK1

FL5

L1/RA

RF IN

RL1/1

C15

10nF

SK2

C45

10uF

C43

1uF

56R

27R

22R

10nF

2 4

A04

56R

51R

470nH

R6 (10)

(AOT)

2N2219A

R28

220

R27

220

D12

D13

D15

D16

C21

100nF

10n

C52

10n

C51

10n

LK6

C38

1500uF

C37

1500uF

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19b

19a

TITLE

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CHECKED

ENG. APP.

CONTRACT No.

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DISCLOSE TO ANY

THIRD PARTY

WITHOUT WRITTEN

CONSENT

OF14

IRT Electronics Pty. Ltd.

DRAWING No.

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K.N.

OPTICAL DETECTOR

803955

21a,b

22a,b

23a,b

24a,b

25a,b

26a,b

+12V

-5.2

PCB ASSEMBLY

RWR-3085

27a,b

20a,b

-5.2V

28b

29a,b

30a,b

31a,b

32a,b

+12V

18a

18b

17a,b

8a,b

7a,b

6a,b

1a,b

+12V

'LOW SIGNAL'

J1/RA,P1

-5.2V

28a

+12V

+12VALARM LED

-5.2V

GND

ALARM RELAY

RF OUT

V+

V++

DETECTOR & CONTROL CCT

803955.PA2

REAR ASSY

RF OUT THRO

2 4/01/99

PCB 803555R/X

D1-4

1N4004

D5-8

1N4004

1 3

FL1

1 3

FL2

1 3

FL5

1 3

FL3

1 3

FL4

JP1

0R0

L10

4u7

C45

1500uF

C44

1500uF

C46

1uF

Adj

LM317T

Adj 1

U10

LM337T

R25

2K05

R27

R26

R24

240

C47

1uF

C50

1uF

C48

1uF

C51

1uF

C53

10uF

C52

10uF

1 3

D21

C6V8

R30

C49

1uF

LD1

RED

C56

10nF

C55

10nF

JP3

0R0

SK2/RA

SK1/RA

J2/RA

4u7

C61

10n

C62

10n

4u7

C33

10n

C27

10n

2 1

LK1

LD2

(GRN)

POWER

2R2

L1/RA

R57

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OF24

IRT Electronics Pty. Ltd.

DRAWING No.

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K.N.

OPTICAL DETECTOR

803955

PCB ASSEMBLY

+VA

+12V

+12

ALARM LED

'MANUAL GAIN'

'AGC SET'

+12

+12V

GND

ALARM RELAY

RF OUT

SET LK6 AS REQUIRED

NOT ENERGISED = ALARM)

(AS SHOWN RELAY

n.o.

n.c.

+12V +12V

+12V

2 4/01/99

+12V

FOR AGC GAIN CONTROL SET LK2 2-3 LK3 CLOSED LK4 OPEN

SET LK2 1-2 LK3 OPEN LK4 CLOSEDFOR MANUAL GAIN CONTROL RWR-3085

RF OUT THRO

REAR ASSY

PCB 803555/X

-5.2V -5.2V

-5.2V

-5.2V-5.2V

-5.2V

3Q1

U71

10n

470

10n

4u7

1 8

RL1

FBR21

RL1

C34

10n

R16

10K

C36

100nF

R20

100

C35

100nF

AD8307

00 -+

U11B

LM358

U11A

LM358

84 -+

U12A

LM358

BC846

C39

10n

C40

10n

JP2

0R0

C41

10n

R22

10K

C27

10n

C29

10n

C30

1nF

C31

100nF

C33

10n

C32

10n

R14

680

R13

100

C28

10n

100K

C10

10nF

C18

10n

C22

10n

C14

10n

C16

1uF

470nH

470nH C26

10n

C23

10n

C24

1uF

R12

33R

C25

1nF

4u7

R10

56R

R11

56R

C21

1nF

C15

10n

U5BTL072 2

84 -+

U5A

TL072

RV2

1MEG

R18

100

C37

100nF

U12B

LM358

R17

10K

R56

10K

2 1

D11

BAS32

R31

10K

C60

10n

R55

100

R54

10K

R49

10K

C71

1uF

R45

R46

R44

R47

R42

C57

10uF

C58

10uF

C38

10n

2 4

MAV-11

R51

10K

R52

10K

R50 10K

R48

10K

RV3

10K

C17

10nF

TP2 TP1

RV1

2 4

A03

1 3

D10

4V7

(Z1)

1 3

D12

BAT54

(L4)

R23

2K2

R28

10K

1 3

6V8

(Z5)

C13

1uF

R21

2K7

R15

82R

C74

1uF

4u7

C12

10n

R53

12K C11

4u7

10n

10K

3 1

LK2

4u7

R19

47K

C20

N/C

C19

N/C

100nH

2 1

LK3

LK6

RV5

1OK

C54

1uF

C72

10nF

C73

10nF

C61

10n

C59

10n

R32

10K

2 1

LK4

C43

10n

C69

10n

D20

BAS32

D19

8V2

R43

470

C70

10uF

100

2 4

A03

200

R29

4K7

100R

DET

FRM13R621CU

10nF

470nF

10n

1uF

10n

U13

LM311M

IRT Communications

www.irtcommunications.com

Title

SCALE

SIZE

Sheet

DRAWN

CHECKED

ENG. APP.

Revision:

DO NOT COPY NOR

DISCLOSE TO ANY

THIRD PARTY

WITHOUT WRITTEN

CONSENT

of1

IRT Electronics Pty. Ltd.

Drawing No.

ARTARMON NSW AUSTRALIA 2064

N.T.S. 2

ZWR-3085/6RH

804298

Date:

17-Sep-2001

C/O Rear Panel for RWR-3085/6

K.N.

1 10-07-2000

1013

RL1

G5Y-254P

10a

10b

11a

11b

12a

12b

13a

13b

14a

15a

15b

17a

17b

18a

18b

20a

20b

14b

21a

21b

22a

22b

23a

24b

24a

25b

26a

27a

27b

28a

23b

19a

19b

30a

30b

26b

31a

31b

32a

32b

25a

16a

16b

28b

29a

29b

10a

10b

11a

11b

12a

12b

13a

13b

14a

15a

15b

17a

17b

18a

18b

20a

20b

14b

21a

21b

22a

22b

23a

24b

24a

25b

26a

27a

27b

28a

23b

19a

19b

30a

30b

26b

31a

31b

32a

32b

25a

16a

16b

28b

29a

29b

SK1 BNC

SK2 BNC

2 1

D1 21 D2

SK4

SK3

No connection

Pins cut short

L1L2

O/P1 MAIN

O/P2 STANDBY

+ volts from RWR-3085/6 module

In the RWR-3085 and RWR-3086 modules LK6 must be placed in position 1-2. This will provide a contact closure to ground at SK4 when signal is present.

Note: For operation of two recievers in a Main - Standby mode the following connections must be made.

In the RWR-3085 and RWR-3086 modules LK1 must be closed. This will provide +ve voltage for the relay on the rear assembly.

The relay on the rear assembly connects the output of the Main module to O/P1 connector SK1 in the energised condition.

At the same time the output of the Standby reciever will be connected to O/P2 connector SK2. On change over these signal connections will swap.

Wiring SK3 PIN 2 to SK4 PIN 3 will complete the circuit, so that O/P1 is the main output and on failure the relay will release and switch to the output from the standby module.

NOTE: THIS IS IMPORTANT 'AN ALARM CAN ONLY BE OBTAINED FROM THE RWR-3086 WHEN LK2 IS IN THE "AGC" POSITION pin 2 - pin 3.

When operating the RWR-3085 in "AGC" LK2 pin2 - pin 3, and LK3 closed an alarm will occur on loss of "RF SIGNAL".

When using the RWR-3085 with LK2 in the "MAN" position pin 1-pin 2, and LK4 closed an alarm will occur on loss of optical signal level.

Thus a RWR-3086 will give an alarm on loss of "RF SIGNAL" at the reciever and the required "RF SIGNAL LEVEL" must be set by RV2.

The factory preset is for a "RF SIGNAL LEVEL" at the output of -10dBm when the RWR-3086 is operated in the "AGC" mode.

External wire for change over on alarm from main module.

Standby Reciever ModuleMain Reciever Module

2 24-07-2000

LINK SETTINGS IN BOTH RWR-3085 MODULES.

LK1 CLOSED

LK6 1-2

MANUAL GAIN