Page 1
3810-rwt.ib.rev1.doc Page 1 of 11 17/10/2007
IRT Eurocard
Types RWT-3810 / RWR-3810
L Band RF Fibre Optic Link
DANGER
A
void direct exposure to beam
Peak power 1 mW
Wavelength 1300 nm
Invisible LASER radiation-
Class 1 LASER Product
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: [email protected]
Web: www.irtelectronics.com
IRT Communications
www.irtcommunications.com
Page 2
3810-rwt.ib.rev1.doc Page 2 of 11 17/10/2007
RWT-3810 / RWR-3810
L BAND RF FIBRE OPTIC LINK
Instruction Manual
Table of Contents
Section Page
General description 3
Technical specifications 5
Pre-installation 6
Operational safety 6
Installation 7
Installation in frame 7
Front and rear layouts 9
Maintenance & storage 10
Warranty & service 10
Equipment return 10
Drawing index 11
IRT Communications
www.irtcommunications.com
Page 3
3810-rwt.ib.rev1.doc Page 3 of 11 17/10/2007
IRT Eurocard
RWT-3810 / RWR-3810
L BAND RF FIBRE OPTIC LINK
General description
The IRT RWT-3810 / RWR-3810 wide band RF fibre optic link is a modular system for transmitting a broadband
RF signal ranging from 900 MHz to 2050 MHz along an optical fibre. A system consists of two IRT Eurocard
modules, the RWT-3810 LASER transmitter module and the RWR-3810 photo-diode receiver module.
RWT-3810 Laser Transmitter.
The RWT-3810 LASER transmitter module consists of a wide bandwidth LASER diode, whose operating current is
set by a driver circuit controlled by feedback from the monitoring diode in the laser package. A wide band RF
amplifier is used to drive the LASER with the RF signal applied to the module input.
A RF gain control and RF monitor connector are provided on the front panel. The gain of the RF amplifier is
adjusted by the front panel control (RV1), which varies the bias on the attenuator circuit in the RF gain stage.
The gain is adjusted for best signal to noise and inter-modulation performance by setting the RF level at the front
panel RF monitor connector at –40dBm.
The laser internal monitoring diode output is connected to comparator circuits, which are used to provide optical
power indications. The circuits drive LD3 on the front panel for laser power ON and FAIL indication (green for
normal and red for failure), and after passing through a relay circuit, a LASER POWER ALARM is available as an
external connection. The adjustment and connection data for this circuit is given in the installation section of the
manual.
A 10.7 MHz pilot tone generator circuit is provided which with a detector circuit in the RWR-3810 receiver will
verify the RF signal path of the system. The pilot tone level from the generator is monitored by a detector circuit
whose output will be indicated by LD2 (green for normal and red for failure), an d can, by closing LK2, operate the
alarm relay circuit if a failure occurs.
LNB DC power can be applied to the RF cable connection to the RWT-3810 by closing LK4 on the board and
applying the required DC voltage to SK3 on the rear panel.
SK3 pin 1 is the ground connection and pin 2 is the active connection. The circuit is not polarity sensitive.
The power supply comprises two bridge rectifiers whose rectified outputs are paralleled (positive and negative
respectively) to provide redundancy. The inputs to these rectifiers are two independent feeds of 28 Vac (centre tap
grounded). The rectified DC is regulated by three-terminal regulators. The DC indicator LED on the front panel is
wired in series with a zener diode between +12 and -12 Volts. The zener is to ensure that the LED extinguishes if
any one of the regulators fails.
IRT Communications
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Page 4
3810-rwt.ib.rev1.doc Page 4 of 11 17/10/2007
RWR-3810 Photo-diode Receiver.
The RWR-3810 photo-diode receiver module consists of an optical detector diode circuit with integral preamplifier. Integrated attenuator and discrete amplifier circuits follows to set the output RF level of the system.
A RF gain control and RF monitor connector are provided on the front panel. The gain of the RF amplifier is
adjusted by the front panel control (RV3), which varies the bias on the attenuator circuit in the RF gain stage. The
RF level can be varied from –45dBm to –20dBm at the output RF connector for a correctly modulated RWR-3810
transmitter. The RF level at the front panel monitor connector is set at the same level as the rear panel RF output,
this allows the RF level to be checked as the RF gain is adjusted. This output should be terminated with the 75 ohms
termination provided when not in use.
The bias current of the optical detector diode is connected to a comparator circuit, which is used to provide received
optical signal indication. The circuit will light indicator lamp LD3 on the front panel for OPTICAL SIGNAL
indication (green for normal and red for failure), and with LK1 closed will operate a relay circuit, an ALARM
contact set is available as an external connection. The adjustment and connection data for this circuit is given in the
installation section of the manual.
A 10.7 MHz pilot tone detector circuit is provided which with the pilot generator circuit in the RWT-3810
transmitter will verify the RF signal path of th e system. The pilot ton e level is monito red b y a detecto r circuit wh o se
output will be indicated by LD2 (green for normal and red for failure), and can, by closing LK2, operate the alarm
relay circuit if a failure occurs.
The power supply comprises two bridge rectifiers whose rectified outputs are paralleled (positive and negative
respectively) to provide redundancy. The inputs to these rectifiers are two independent feeds of 28 Vac (centre tap
grounded). The rectified DC are regulated by three-terminal regulators. The LED on the front panel is wired in
series with a zener diode between +12 and -5.2 Volts. The zener is to ensure that the LED extinguishes if any one of
the regulators fails.
NOTE: Direct connections are made to the rear of the RWT-3810 and RWR-3810 modules for the
OPTICAL and RF cabling, these must be disconnected when a module is to be mounted or removed from the
IRT Eurocard mounting frame.
IRT Communications
www.irtcommunications.com
Page 5
3810-rwt.ib.rev1.doc Page 5 of 11 17/10/2007
RWT-3810 / RWR-3810 Technical specifications
RF signal connections 75 ohms SMC on rear connector panel. (BNC and F
adapters provided.)
RF input level Adjustable in the range
-40 dBm to –20 dBm total power.
RF output level Adjustable in the range
-45 dBm to –20 dBm total power.
Input / output VSWR <2:1 (75 Ω / 50 Ω).
System 3rd order intercept (IP3) >+10 dBm.
System frequency response 900 MHz to 2050 MHz operation
500 MHz flatness ± 1.5 dB
36 MHz flatness ± 0.5 dB
System group delay ± 2 ns, 900 MHz - 2050 MHz
Carrier to noise >26 dB for 36 MHz bandwidth
Inter-modulation products. < 40 dBc.
Optical output power -7 to -10 dBm.
System optical budget > 4 dB.
Optical signal connections SC angle faced (accessible from the rear of the
module) for use with single mode (9/125µm) fibre
cable.
LNB Power 13V or 18V input to RWT-3810 rear panel, SK3.
Power requirement 14V-0-14V AC /3.5 VA
Temperature range 0 - 45° C ambient
Mechanical 6 HP x 3 U x 220 mm IRT Eurocard
Suitable for mounting in IRT 19" rack chassis.
Fibre, RF & alarm connections at the rear.
Finish: Front escutcheon Grey with black lettering & red IRT logo
Rear assembly Detachable silk screened PCB with direct mount
connectors to Eurocard and external signals
Standard accessories Matching control connector is supplied with the TX
module, and RF adapter connectors for conversion
to BNC and F is supplied with both modules.
Optional accessories TME-6 module extender card
NOTE: All the parameters specified are only applicable when using single mode (9/125µm) fibre cable with a
return loss of >= 27 dB.
Due to our policy of continuing development these specifications are subject to change without notice.
IRT Communications
www.irtcommunications.com
Page 6
3810-rwt.ib.rev1.doc Page 6 of 11 17/10/2007
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.
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.
IRT Communications
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Page 7
3810-rwt.ib.rev1.doc Page 7 of 11 17/10/2007
Installation
NOTE: Direct connections are made to the rear of the RWT-3810 and RWR-3810 modules for the OPTICAL
and RF cabling, these must be disconnected when a module is to be mounted or removed from the IRT Eurocard
mounting frame.
Installation in frame or chassis:
See details in separate manual for selected frame type.
RWT-3810 LASER transmitter module
The RWT-3810 is factory preset for a optical output of –7 dBm to –10 dBm and a RF input level of –40 dBm.
Installation requires the unit to be plugged into the front of the selected IRT frame and the rear assembly to be
secured to the rear panel of the IRT frame. To install the module in a FRU-3000 or FRU-1030 frame please see the
separate instruction manual “Eurocard Frames & Power Supplies”.
RF signal connection is made to the 75 ohms SMC connector on the rear panel of the RWT-3810, adapters are
supplied to allow connection to circuits using BNC or F series connectors.
A RF signal monitor connector is provided on the front panel. The RF level at this connector should be –40dBm as
adjusted by the front panel RF gain control RV1. At this RF level the laser modulation is set for the best signal to
noise and inter-modulation of the transmission system. For a input signal of –40dBm the RF gain control will be at
the maximum (fully clock-wise) position, for higher input levels the gain will have to be backed up and adjusted to
set the level at the RF monitor connector to –40dBm. Note: the RF Monitor connector will need to be
terminated with the 75 ohms termination provided when not in use.
Optical signal connection is made to the SC/APC optical connector on the rear of the RWT-3810. Extreme care
must be taken to ensure the cleanliness and consequently the best return loss of the optical connections.
The optical output power is monitored by comparator circuits, which are adjusted to change state if the output level
varies by more than ± 3dB from the output level set during align ment. A led indicator on the front panel will light
green when the laser is operating normally and change to red if the laser power deviates be ± 3dB from the pre-set
level.
The RWT-3810 includes a pilot tone generator at 10.7 MHz. This allows for the verification of the RF signal path at
the receiver. A led indicator on the front panel will light green when the pilot is operating normally and change to
red if the pilot signal fails.
The alarm circuit accepts signals from the laser power low always, from the laser power high on LK1 closure and
pilot fail circuit on LK2 closure to op erate relay RL1. External connections from the alarm relay are available on
pins 2 and 3 of SK4 on the rear panel. The alarm circuit is wired to give a relay contact closure when a fault
condition such as power failure, low or high optical output, failure of the pilot tone generator occurs. A second
alarm contact closure is available at J3.
LNB power can be applied to the RF in cable through J3 on the rear panel after closing LK5.
DANGER
A
void direct exposure to beam
Peak power 1 mW
Wavelength 1300 nm
Invisible LASER radiation-
Class 1 LASER Product
IRT Communications
www.irtcommunications.com
Page 8
3810-rwt.ib.rev1.doc Page 8 of 11 17/10/2007
RWR-3810 photo-diode receiver module
The RWR-3810 is factory preset for use with the accompanying RWT-3810 transmitter and a optical path
attenuation of 2 dB, to give unity gain in the RF signal path.
Installation requires the unit to be plugged into the front of the selected IRT frame and the rear assembly to be
secured to the rear panel of the IRT frame. To install the module in a FRU-3000 or FRU-1030 frame please see the
separate instruction manual “Eurocard Frames & Power Supplies”.
RF signal connection is made to the SMC connector on the rear of the RWT-3810, adapters are supplied to allow
connection to circuits using BNC or F series connectors
Optical signal connection is made to the optical connector on the rear panel of the RWR-3810. Extreme care
must be taken to ensure the cleanliness and consequently the best return loss of the optical connections.
To overcome any optical path loss the RF signal level can be set using the front panel gain control (RV3), while at
the same time monitoring the output level using the front panel RF monitor connector which outputs the same RF
level as the rear output connector. Note: the RF Monitor connector will need to be terminated with the 75 ohms
termination provided when not in use.
The optical input signal level is monitored by a current sense and comparator circuit, which is adjusted to change
state if the optical path loss exceeds the maximum optical budget by 3 dB.
The alarm circuit accepts signals from the optical level on LK1 closure and pilot fail circuits on LK2 closure to
operate relay RL1. The external connections for the alarm circuit are available on pins 2 and 3 of SK4 on the rear
panel. The alarm circuit is wired to give a relay contact closure when a fault condition such as power failure or low
optical input occurs. A second alarm contact closure is available at J3.
RWT-3810 adjustments.
RV1 sets the RF modulation level of the laser by applying a bias voltage to the RF attenuator circuit.
RWT-3810 Preset adjustments.
RV2 sets the output LOW indicator circuit as shown by LD3 on the front panel.
RV3 sets the output HIGH indicator circuit as shown by LD3 on the front panel.
RV4 sets the bias current to the laser diode and thus the optical output from the RWT-3810.
RWR-3810 adjustment.
RV3 sets the output RF level of the module by applying a bias voltage to the RF attenuator circuit.
RWR-3810 Preset adjustment.
RV1 sets the pilot SIGNAL LOW alarm circuit threshold as shown by LD2 on the front panel.
RV2 sets the input SIGNAL LOW alarm circuit threshold as shown by LD3 on the front panel.
Diagrams are provided for the RWT-3810 and the RWR-3810. 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.
NOTE: If it is necessary to remove a component from the circuit board during
maintenance IT IS ESSENTIAL TO ADD SOME SOLDER TO THE
COMPONENT SOLDER JOINTS BEFORE REMOVAL IS ATTEMPTED. This
will add some solder flux to the joint and allow the heat from the iron to flow quickly
into the joint and prevent localised overheatin g and damage to the circuit board.
Rear assemblies may be removed for maintenance. Make sure that extraction force is
applied equally and steadily at the top and bottom of the rear assembly. SHOULD THIS
NOT BE DONE THERE IS A GOOD CHANCE THAT YOU WILL BEND THE
MODULE CONNECTOR PINS making it very difficult to re-install the rear assembly.
IRT Communications
www.irtcommunications.com
Page 9
3810-rwt.ib.rev1.doc Page 9 of 11 17/10/2007
RF Mon.
DC
RWT-3810
N140
RF GAIN
PILOT
LASER
CAUTION
Direct
connections
to module
RF GAIN
PILOT
OPTICAL
DC
RWR-3810
N140
RF Mon.
CAUTION
Direct
connections
to module
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.
L BAND F.O. TX
3
2
1
SK4
OPTICAL
OUT
RF
IN
J3
2
1
SK3
Alarm
Alarm
LNB
DC
IN
L BAND F.O. RX
3
2
1
SK4
OPTICAL
IN
RF
OUT
J3
Alarm
Alarm
IRT Communications
www.irtcommunications.com
Page 10
3810-rwt.ib.rev1.doc Page 10 of 11 17/10/2007
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 1 hour’s labour, at IRT’s current labour charge rate, 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 1 hour’s labour will apply,
whether the equipment is within the warranty period or not. Contact IRT for current hourly rate.
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
IRT Communications
www.irtcommunications.com
Page 11
3810-rwt.ib.rev1.doc Page 11 of 11 17/10/2007
Drawing index
Drawing # Sheet # Description
804586 RWT-3810 schematic block diagram
804421 RWR-3810 schematic block diagram
IRT Communications
www.irtcommunications.com
Page 12
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.
COPYRIGHT
ARTARMON NSW AUSTRALIA 2064
A3
N.T.S.
1
RWT-3810
804586
Date:
1
6-May-2002
K.N.
1 01-02-02
ALARM
Laser RF
Laser circuit
Laser
J2 optional power in
(used when fitted to FRU-1030 frame)
123
J2
SK1
AC 1
AC 4
AC 2
AC 3
Power Supply Circuit
Power
31
2
LK3
'DC'
grn
12
R71
680R
21
LD1
+12V
n.c.
n.o.
1 3
2
D12
BZX84C12
-5V
1A1B2A2B3A3B4A4B5A
6A6B7A7B8A
8B
10A
10B5B11A
11B
12A
12B
13A
13B
14A
15A
15B
17A
17B
18A
18B
9A
9B
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
P1
DIN64RA
1 2
C38
100nF
+12V
Laser RFRF Input
RF Mon.
Pilot
Pilot Present
LNB Power
RF circuit
RF
PilotPilot Present
Pilot Generator
Pilot
SK2
RF IN
RF MON.
L-Band Fibre Optic Tx.
1
2
J3
LASER
PILOT
GAIN
MON.
DC
21
LK2
1A1B2A2B3A3B4A4B5A6A6B7A7B8A8B
10A
10B5B11A
11B
12A
12B
13A
13B
14A
15A
15B
17A
17B
18A
18B
9A
9B
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
J1
DIN64
2 1
D13
LS4148
1
2
SK3
LNB DC INPUT
Alarm Logic
Rear Panel
Alarm Relay Contacts
13
2
D8
BAT54
Rear Panel
Front Panel
'Laser On'
grn
1 2
R69
680R
+12V
red
'Alarm'
1
3
2
LD3
L-3WEGW
1 2
R68
10K
1 2
R70
10K
red
grn
123
com.
1
32
Q13
BC846
1
32
Q12
BC846
32
1
Q11
BSS123
1 12
RL1A
FBR46ND012
7
8
10
RL1C
31
2
LK4
n.c.
n.o.
6
5
3
RL1B
'Pilot On'
grn
1 2
R66
680R
+12V
red
'Alarm'
1
3
2
LD2
L-3WEGW
1 2
R65
10K
1 2
R67
10K
red
grn
123
com.
1
32
Q10
BC846
1
32
Q9
BC846
32
1
Q8
BSS123
123
SK4
2 1
LK5
1 2
C70
0.1uF
21
D10
LS4148
21
D9
LS4148
1 3
2
D7
BAT54
1
32
Q4
BC846
1 2
R33
10K
+12V
(1B)
(Y2)
(L4)
(L4)
IRT Communications
www.irtcommunications.com
Page 13
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.
COPYRIGHT
ARTARMON NSW AUSTRALIA 2064
A3
N.T.S.
1
RWR-3810
804421
Date:
1
6-May-2002
K.N.
Signal
Pilot
RF Out
RF Mon.
Detector circuit
Detector
J2 optional power in
(used when fitted to FRU-1030 frame)
123
J2
SK1
AC 1
AC 4
AC 2
AC 3
Power Supply Circuit
Power
31
2
LK3
'DC'
'grn'
1 2
R9
680R
+12V
n.c.
n.o.
1 3
2
D3
BZX84C12
-5.2V
1A1B2A2B3A3B4A4B5A
6A6B7A7B8A
8B
10A
10B5B11A
11B
12A
12B
13A
13B
14A
15A
15B
17A
17B
18A
18B
9A
9B
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
P1
DIN64RA
1 2
R10
4K7
+12V
Pilot InPilot Present
Pilot Detector
Pilot
SK2
RF OUT
RF MON.
L-Band Fibre Optic Rx.
1
2
J3
OPTICAL
PILOT
GAIN
MON.
DC
1A1B2A2B3A3B4A4B5A6A6B7A7B8A8B
10A
10B5B11A
11B
12A
12B
13A
13B
14A
15A
15B
17A
17B
18A
18B
9A
9B
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
J1
DIN64
2 1
D7
LS4148
1 10-01-02
+12V
'Pilot'
grn
1 2
R12
680R
red
'Alarm'
1
3
2
LD2
L-3WEGW
1 2
R11
10K
1 2
R13
10K
red
grn
123
com.
13
2
D1
BAT54
13
2
D2
BAT54
1
32
Q4
BC846
1
32
Q3
BC846
32
1
Q2
BSS123
'Signal'
grn
1 2
R15
680R
+12V
red
'Alarm'
1
3
2
LD3
L-3WEGW
1 2
R14
10K
1 2
R16
10K
red
grn
123
com.
1
32
Q7
BC846
1
32
Q6
BC846
32
1
Q5
BSS123
Alarm Logic
Alarm Relay
Rear Panel
Front Panel
21
LK1
21
LK2
Rear Panel
1
32
Q1
BC846
1 12
RL1A
FBR46ND012
7
8
10
RL1C
31
2
LK4
n.c.
n.o.
6
5
3
RL1B
123
SK4
21
D4
LS4148
21
D5
LS4148
1 2
C13
100nF
21
LD1
HLMP-1503
Contacts
BC846B (1B)
BSS123 (SA)
(1B)
+12
IRT Communications
www.irtcommunications.com
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