Vega Telex HB-3PLUS User manual

Model HB-3PLUS
Headset Adaptor Panel
Technical Manual
March 8, 2005 P.N. 804138 Rev A

HB-3plus Headset Adaptor Box i
Table of Contents
1General ...................................................................................1
1.1 Accessories ..................................................................................................................... 1
2Installation..............................................................................2
2.1 HB-3PLUS Mounting..................................................................................................... 2
2.2 HB-3PLUS Setup............................................................................................................ 2
2.2.1 PC/Console Mode................................................................................................... 2
2.2.2 Headset I and II Connections.................................................................................. 2
2.2.3 Desk Microphone Connection ................................................................................ 3
2.2.4 Headset ON/OFF switch......................................................................................... 3
2.3 Rear Panel Connections.................................................................................................. 3
2.3.1 Power Supply Connection....................................................................................... 3
2.3.2 Serial Connection.................................................................................................... 3
2.3.3 Relay Connections.................................................................................................. 3
2.3.4 AUX IN Connections.............................................................................................. 4
2.3.5 Recorder Connections............................................................................................. 4
2.3.6 Footswitch Connections.......................................................................................... 4
2.3.7 Console Connections .............................................................................................. 4
2.3.8 NENA Phone Connections ..................................................................................... 5
2.3.9 HB-3PLUS to PC Sound Card Connections........................................................... 5
3Audio Level Adjustments......................................................6
3.1 Desk Microphone TX Level ........................................................................................... 6
3.2 NENA Phone Level ........................................................................................................ 6
3.3 Recorder Level................................................................................................................ 6
3.4 Headset Transmit Level.................................................................................................. 6
4Theory of Operation ..............................................................7
4.1 Console Mode................................................................................................................. 7
4.2 PC Mode ......................................................................................................................... 7
5Schematics and Parts Lists..................................................7
6Warranty, Service, Repair, and Comments:........................8
Table of Figures
Figure 1 HB-3PLUS Front View....................................................................................................2
Figure 2 HB-3PLUS Rear View.....................................................................................................3
Figure 3 Relay Connections............................................................................................................ 3
Figure 4 Recorder and AUX IN Connections................................................................................. 4
Figure 5 Footswitch Connections ................................................................................................... 4
Figure 6 HB-3 To Console Connector Pin-out............................................................................... 4
Figure 7 NENA to PC Connections and Pinout.............................................................................. 5
Figure 8 HB-3 PLUS to PC Connection Diagram.......................................................................... 5

HB-3plus Headset Adaptor Box 1
1 General
The Vega HB-3PLUS Headset Interface Box is a reliable method for connecting a desk microphone,
headsets and footswitch controls to any computer running Vega’s C-Soft program or any Vega dispatch
console. A bi-color front panel LED indicates power (green) or active PTT (red).
The HB-3PLUS connects directly to the handset jack of the dispatch control console or a PC operating
with the Vega C-Soft dispatch software. In the console mode, an RJ-H 4 conductor cable provides the
connection from the HB-3PLUS to the console. Connections to the PC serial port and sound card provide
PTT, monitor, relay and Aux input control in the PC mode.
The HB-3PLUS also provides a connection to any telephone device with a NENA I/O port, allowing for a
single headset to be shared by the radio and phone system. When the phone set is taken off-hook, the
headset microphone audio is routed to the phone system and selected radio is transferred back to the
SELECT speaker. Telephone audio is routed to the headset as long as the system is off-hook.
The HB-3PLUS Features:
• 2 Dual ¼’ headset jacks
• Independent SELECT volume controls
• Switch selectable headset on/off
• 1 Desk microphone input
• 3 Independent footswitch inputs
• Power and PTT LED indicator
• 1 NENA I/O port
• 2 AUX relays (Form C contacts)
• 2 AUX IN TTL inputs
• Balanced common recorder output
• Separate balanced UNSELECT audio recorder output
Jumper Selectable Options:
• PC/Console Mode
• C-Soft mic output level set (Mic/Line)
• Headset electret mic DC polarity
• Electret/Dynamic desk mic select
• Route UNSELECT audio to headsets
• Route UNSELECT audio to common recorder output
1.1 Accessories
Several optional accessories are available for the HB-3PLUS.
Part Number: Description:
0108024 FS-1 Footswitch.
2490161 Single Muff Headset with Microphone and inline PTT switch.
24901611 Dual Muff Headset with Microphone and inline PTT switch.
0118022 MD-MSDesk Microphone

2HB-3plus Headset Adaptor Box
2 Installation
2.1 HB-3PLUS Mounting
The HB-3PLUS may be mounted either under or along the side of a dispatch position, choose a
location that allows for easy headset connection and is free of direct hits from chair arms and
personnel knees.
2.2 HB-3PLUS Setup
2.2.1 PC/Console Mode
Operations of the HB-3PLUS with Vega C-Soft or tone remote consoles are set by JMP8.
A – PC Mode
B – Console Mode
Figure 1 HB-3PLUS Front View
2.2.2 Headset I and II Connections
The HB-3PLUS operates with either 4 or 6 wire Dual ¼” Phone Jack plugs. The standard
configuration for the HB-3PLUS is for operation with a 6-wire plug configuration. The horizontal
lines adjacent to the right phone jack of each headset pair are a polarity symbol for stereo
headsets. Internal, selectable jumpers set the configuration of each headset port.
Headset I
JMP12 – Routes SELECT or UNSELECT audio to the headset
A – UNSELECT and SELECT audio to headset
B – SELECT only audio to headset
JMP10/11 – Sets the DC voltage polarity to the headset mic
A – DC+ to the horizontal line jack
B – DC- to the horizontal line jack
CAUTION – Both JMP10 AND JMP11 Must Be Set Together To A Or B
Cutting the small trace between JMP13 disables the PTT function for 4-wire headset operation
Headset II
JMP3 – Routes SELECT or UNSELECT audio to the headset
A – UNSELECT and SELECT audio to headset
B – SELECT only audio to headset
JMP4/5 – Sets the DC voltage polarity to the headset mic
A – DC+ to the horizontal line jack
B – DC- to the horizontal line jack
CAUTION – Both JMP4 AND JMP5 Must Be Set Together To A Or B
Cutting the small trace between JMP6 disables the PTT function for 4-wire headset operation.

HB-3plus Headset Adaptor Box 3
2.2.3 Desk Microphone Connection
The HB-3PLUS is designed to operate with Vega’s standard MD-MS desk microphone (electret)
or a dynamic desk microphone, for dispatch activities using Vega’s C-Soft dispatch software.
SELECT and UNSELECT audio is routed directly to the computer speakers. Internal jumper
JMP2 selects the electret or dynamic microphone configuration.
A – Electret
B – Dynamic
2.2.4 Headset ON/OFF switch
The headset ON/OFF switch is used to provide hook signaling to a Vega dispatch console or C-
Soft application. When OFF, SELECT audio switches from the headset to the speaker. When
using a desk microphone the switch must be in the OFF position.
2.3 Rear Panel Connections
Figure 2 HB-3PLUS Rear View
2.3.1 Power Supply Connection
The HB-3PLUS power requirements are 12 to 16 VDC, 500mA. A wall mounted power supply is
included with the HB-3PLUS. Power connection is made via a 2.5mm plug receptacle on the rear
panel of the unit. The positive terminal is the center conductor.
2.3.2 Serial Connection
The serial port is enabled in the HB-3PLUS when the PC Mode is set by JMP8. The serial port is
configured for 9600-baud, 1stop bit, no parity, and DCE connections. A serial cable is provided
for connection to the PC.
In the PC Mode, the HB-3PLUS provides the PC with serial data for PTT, Monitor, relay control
and AUX input functions.
2.3.3 Relay Connections
The HB-3PLUS provides two Form C relay contacts for
general use. Each relay is controlled by the C-Soft
application; please refer to the C-Soft manual for use of this
feature. A 1 Amp resettable fuse protects both sets of
contacts.
A 6-pin screw terminal block provides connection to the
relays. Refer to Figure 3 Relay Connections drawing.
NOTE: The Relays Are Operational In The PC Mode ONLY
Figure 3 Relay Connections
1 2 3 4 5 6
1) Relay 1 COM 2) Relay 1 N.O.
3) Relay 1 N.C. 4) Relay 2 COM
5) Relay 2 N.O. 6) Relay 2 N.C.

4HB-3plus Headset Adaptor Box
1 2 3 4 5 6
1) Desk Mic IN 2) Ground
3) Headset I IN 4) Ground
5) Headset II IN 6) Ground
2.3.4 AUX IN Connections
The AUX IN connections detect a contact closure to ground and send the information to the C-
Soft application. Each input is diode protected from voltages above +5VDC.
The two AUX inputs are located at pins 1 and 2 of the middle 6-pin screw terminal block.
Please refer to the C-Soft manual for use of this feature. Refer to Figure 4 Recorder and AUX IN
Connections. NOTE: The AUX IN Inputs are Enabled In The PC Mode ONLY
2.3.5 Recorder Connections
The HB-3PLUS provides two balanced recorder outputs. The impedance of each balanced output
is 600 ohms.
Common Recorder Output
The common recorder output sums and amplifies all sources
of audio passing through the HB-3PLUS to a balanced output
for a single position recorder capability. Internal jumper JMP9
sets the routing of the UNSELECT audio to the common
recorder output.
A – UNSELECT audio
B – No UNSELECT audio
The Common Recorder Output is provided at pins 3 and 4 of
the middle 6-pin screw terminal block marked RECORDER
OUT. Figure 4 Recorder and AUX IN Connections
UNSELECT Audio Recorder Output
The UNSELECT Audio Recorder Output provides UNSELECT audio to a separate balanced
output. The UNSELECT Recorder Output is provided at pins 5 and 6 of the middle 6-pin screw
terminal block marked UNSEL REC Out. Refer to Figure 4.
2.3.6 Footswitch Connections
The HB-3PLUS provides separate PTT footswitch inputs for
the desk mic, Headset I and Headset II. The PTT function is
activated by a contact closure to ground. Each input is diode
protected from voltages above +5VDC. Refer to Figure 5.
Figure 5 Footswitch Connections
2.3.7 Console Connections
The HB-3PLUS connects directly to the handset port of a Vega dispatch console (C-5000, C-
1610, C-1616, C-2000, C-2002, IP1616 and C-6200) from the Console RJ-H CONSOLE
connector when the CONSOLE MODE is set by JMP8. A 4-
pin modular cable is provided for connection to the console.
The HB-3PLUS provides the audio paths for radio Tx from the
headset or desk mic and SELECT audio. System PTT and
SELECT audio routing are also controlled by the HB-3PLUS.
SELECT audio is routed to the console speaker when the
Headset Switch in the OFF position or when the NENA system
is off-hook. UNSELECT audio is NOT available to the HB-
3PLUS from the console. NOTE: The Handset Port On The
Console Must Be ENABLED. Refer To The Console
Technical Manual For Instruction
Figure 6 HB-3 To Console Connector Pin-out
1 2 3 4 5 6
1) AUX 1 IN 2) AUX 2 IN
3) Recorder Out 4) Recorder Out
5) UnSel Rec Out 6) UnSel Rec Out
1 2 3 4
1) TX
2) Ground
3) PTT
4) RX
RJ-H Connector Rear View

HB-3plus Headset Adaptor Box 5
2.3.8 NENA Phone Connections
The HB-3PLUS connects to a NENA device from the RJ-12 NENA PHONE connector. The HB-
3PLUS NENA Tx and RX are balanced 600-ohm audio connections to eliminate DC differences
or ground loops between the systems. The off-hook condition is triggered by a contact closure to
ground. The hook switch input is diode protected from DC voltages above +5VDC.
Refer to Figure 7 for the Wiring diagram and connector pin-out.
Figure 7 NENA to PC Connections and Pinout
2.3.9 HB-3PLUS to PC Sound Card Connections
Three Audio Cables are provided for connection of the HB-3PLUS to the PC sound card and
desktop speakers. The desktop speakers MUST be amplified. Refer to Figure 8.
PC with
Soundcard
LR
Amplified Desktop Speakers
SPKR
IN
MIC
OUT SPKR OUT
Speakers
Mic
SERIAL
Select Unselect
Figure 8 HB-3 PLUS to PC Connection Diagram
NENA
Phone
RX from NENA
TX to NENA
Ground
Hook-switch
6 2 & 5 3 & 4 1
NENA PHONE CONNECTOR
1 2 3 4 5 6
1) Hook Switch
2)
OUT
3)
IN
4) IN
5)
Out
6)
Ground
RJ-12 Connector Rear View

6HB-3plus Headset Adaptor Box
3 Audio Level Adjustments
The HB-3PLUS provides five internal adjustments for setting various levels for operation:
• Desk Mic Level
• NENA In
• NENA Out
• Recorder Out
• Recorder Unsel Out
The internal adjustments may be set after the HB-3PLUS is mounted. All five adjustments are
accessible from the bottom of the enclosure and do not require the HB3-PLUS to be open for
adjustment.
The Headset I and II receive volume levels are user adjustable by the SELECT controls on the
front panel
3.1 Desk Microphone TX Level
The MD-MS desk microphone level may be adjusted through the hole on the bottom plate of the
desk microphone. This adjustment is usually set mid-range. Audio level to the console or C-Soft
application may be set from the DESK MIC LEVEL access point through the bottom of the
enclosure.
3.2 NENA Phone Level
The NENA phone levels may be adjusted from the NENA IN and NENA OUT access points on
the bottom of the enclosure.
3.3 Recorder Level
Each recorder output level (Common Recorder and Unsel Recorder) may be adjusted from the
access points on the bottom of the enclosure
3.4 Headset Transmit Level
Each headset TX circuit uses a clipper/filter circuit that does not require any adjustment. The level
is designed to match the requirements of the Vega dispatch consoles or the C-Soft application.

HB-3plus Headset Adaptor Box 7
4 Theory of Operation
4.1 Console Mode
With JMP8 in the “B” position the HB-3PLUS will operate in the console mode. All PTT and headset
audio is routed to the console jack (J1) for connection to the handset jack of any Vega consoles using the
supplied 4-pin modular cable.
Headset I TX audio is amplified for connection to either the console or NENA interface, during radio PTT
the TX audio and PTT signals are sent to the console. If the NENA interface is OFF-Hook, The HB-
3PLUS signals the console and SELECT audio is routed to the console speaker. The NENA RX audio is
routed to the headset earpiece and the headset microphone is routed to the to the NENA TX circuit, if
PTT is pressed the headset microphone is switched to the console TX circuit and console PTT is applied.
4.2 PC Mode
With JMP8 in the “A” position the HB-3PLUS will operate in the PC mode. All PTT and Monitor actions
are routed to the serial port and sent to the PC as serial commands. Headset and desk microphone
audio is routed to the MIC OUT jack.
Headset I TX audio may be switched to either the PC or NENA interface. While radio PTT is active, the
TX audio and PTT signals are sent to the PC. If the NENA interface is OFF-Hook, Selected radio RX
audio is switched to the PC speaker. With radio PTT not active, The NENA RX audio is routed to the
headset earpiece and the headset microphone is routed to the to the NENA TX circuit. When radio PTT is
pressed the headset microphone is coupled to the PC MIC OUT circuit and PTT serial command is
applied to the PC.
5 Schematics and Parts Lists

REVISIONS
RE
V
DESCRIPTION ECO NO DATE
A
PPD
1 PROTOTYPE 41-000146 01/25/05 SBC
UPDATED REV 1 REMOVED JMP6 AND JMP13 01/28/05 SBC
A
ITEM 59 CHANGE PART NUMBER TO 7302831 03/04/05
ITEM 1 QTY TO 26 ITEM 8 QTY TO 10
ITEM 32 QTY TO 97 ITEM 35 QTY TO 3
DELETED ITEM 46 ITEM 47 QTY TO 10
A
DDED ITEM 65
A
DDED ITEM 66
A
DDED ITEM 67
A
DDED ITEM 68
ITEM 53 CHANGED PART NUMBE
R
This drawing, written description or specification Is
a proprietary product of TELEX, Lincoln, NE, and
shall not be released, disclosed, nor duplicated
without the written permission of TELEX.
Telex Communications INC.
Lincoln, Nebraska USA
APPROVALS: DR BY: SBC
DATE: 01/25/2005
PROD:CHK: SBC
DATE; 03/04/05
APPD: JRL
DATE: 03/04/05
880125
REV LEVEL:
PCB ASSY, HB3 PLUS
TITLE:
PART NO:
A
LN,BE PAGE 1 OF 5

ITEM NEW
QTY
TYPE DESCRIPTION PART NO. DESIGNATOR
1 26 CAP 1UF 0805 10V +/-10% 102881875T
C1 C9 C11 C13 C15 C20 C26 C30 C37 C38 C41
C42 C43 C48 C49 C54 C57 C58 C62 C63 C65
C69 C72 C77 C80 C93
2 2 CAP .001UF 0603 50V +/-10% 102881717T C103 C11
0
3 1 CAP 1000UF 25V LEADED 51821526 C124
4 2 CAP 6800PF 0603 50V +/-5% 102881708T C14 C83
5 2 CAP 100PF 0603 50V +/-5% 723482130T C16 C78
6 16 CAP 0.1UF 0603 723489101T
C19 C28 C52 C76 C86 C88 C100 C104 C106
C108 C111 C112 C113 C115 C116 C125
7 18 CAP 47PF 0603 723482126T
C2 C4 C10 C17 C21 C25 C29 C34 C40 C44 C47
C53 C67 C68 C74 C121 C122 C123
8 10 CAP 3.3UF TANT 10V B(3528) 102877021T C3 C18 C22 C39 C64 C66 C75 C91 C109 C114
9 2 CAP 2200PF 0603 50V +/-5% 723483107T C31 C82
10 17 CAP 10uf 16vTANT 3528 B 102877065T
C32 C33 C36 C45 C46 C55 C89 C90 C94 C98
C101 C105 C107 C117 C118 C119 C120
11 18 CAP 470PF 0603 50V +/-5% 723482138T
C5 C6 C7 C8 C12 C23 C27 C35 C59 C60 C61
C70 C71 C73 C79 C84 C95 C97
12 4 CAP 0.01UF 0603 25V +80/-20% 723489100T C50 C51 C92 C10
2
13 2 CAP 33PF 0603 723482124T C81 C8
5
14 13 DIODE MMBD914 SOT-23 58711000T
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12
D16
15 3 DIODE SMT 4004 1A DIODE 760621-4 D13 D14 D1
7
16 1 LED RT ANG. LED RED/GRN 50808800
0
D15
17 6 THYRISTO
R
TVB170SA 710106 F1 F3 F5 F9 F10 F14
18 1 FUSE FUSE AND HOLDER 3 AMP 710105T F13
19 8 FUSE F1250T Teccor Fuse 710109T F2 F4 F6 F7 F8 F11 F12 F15
20 2 FERRITE 0805 FERRITE BEAD 723511T FB1 FB2
21 3 CONN 1/4" STEREO JACK RN112BPC 21-01-028713 J1 J3 J5
22 1 CONN HEADER, 10 PIN SHROUDED 650381 J12
23 1 CONN RT ANG DB9 TH 640149 J13
24 1 CONN 2.5MM LEADED POWER 59697000 J16
25 2 CONN RJ11 TELCO RECEPT 59946000 J2 J7
26 4 CONN 3 Pin Locking Header 2861870 J4 J6 J14 J15
27 1 CONN RT ANGLE 4 PIN HANDSET JACK 640123 J8
28 3 CONN 6 PIN RT ANGLE TERMINAL 2862056 J9 J10 J11
29 11 CONN 3 PIN T/H HEADER 8800124519
JMP1 JMP2 JMP3 JMP4 JMP5 JMP7 JMP8
JMP9 JMP10 JMP11 JMP12
30 11 CONN JUMPER CAP 2515001001
FOR JMP1 JMP2 JMP3 JMP4 JMP5 JMP7 JMP8
JMP9 JMP10 JMP11 JMP12
31 22 TRANSISTOR MMBT3904 54671200
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12
Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22
This drawin
g
, written description or specification Is
a proprietary product of TELEX, Lincoln, NE, and
shall not be released, disclosed, nor duplicated
without the written permission of TELEX.
Telex Communications INC.
Lincoln, Nebraska USA
APPROVALS: DR BY: SBC
DATE: 01/25/2005
PROD:CHK: SBC
DATE; 03/04/05
APPD: JRL
DATE; 03/04/05
880125
REV LEVEL:
PCB ASSY, HB3 PLUS
TITLE:
PART NO:
A
LN,BE Page 2 of 5

ITEM NEW
QTY
TYPE DESCRIPTION PART NO. DESIGNATOR
This drawin
g
, written description or specification Is
a proprietary product of TELEX, Lincoln, NE, and
shall not be released, disclosed, nor duplicated
without the written permission of TELEX.
Telex Communications INC.
Lincoln, Nebraska USA
APPROVALS: DR BY: SBC
DATE: 01/25/2005
PROD:CHK: SBC
DATE; 03/04/05
APPD: JRL
DATE; 03/04/05
880125
REV LEVEL:
PCB ASSY, HB3 PLUS
TITLE:
PART NO:
A
32 97 RES 10K 0603 1% 723481300T
R1 R2 R3 R4 R6 R7 R8 R11 R12 R14 R22 R24
R27 R28 R29 R30 R31 R33 R34 R36 R37 R38
R39 R42 R43 R44 R47 R48 R49 R50 R51 R54
R55 R56 R58 R59 R60 R62 R64 R65 R66 R67
R69 R70 R71 R73 R74 R75 R76 R78 R81 R82
R84 R85 R86 R87 R88 R89 R90 R91 R92 R93
R103 R104 R105 R106 R109 R115 R116 R117
R118 R119 R120 R121 R123 R126 R129 R132
R133 R134 R136 R137 R140 R142 R143 R145
R146 R148 R149 R150 R152 R154 R155 R156
R157 R159 R161
33 1 POT 1MEG VERT. ADJ T/H LINEAR 57148413 R10
34 2 RES 301 OHM 0603 1% 723481146T R112 R131
35 3 RES 27K 0603 5% 723488273T R83 R110 R14
7
36 1 RES 332K 0603 100V 1% 723481450T R153
37 4 POT 100K VERT. ADJ T/H LINEAR 57148410 R17 R45 R107 R12
8
38 26 RES 0 OHM 0603 5% 723488000T
R18 R19 R21 R26 R77 R94 R96 R97 R98 R99
R100 R101 R102 R108 R111 R113 R127 R130
R135 R162 R163 R165 R166 R167 R168 R169
39 1 RES 475K 0603 1% 723481465T R20
40 6 RES 100K 0603 1% 723481400T R23 R53 R57 R110 R138 R14
4
41 2 RES 2.7K 0603 5% 723488272T R32 R3
5
42 2 RES 15 OHM 0603 5% 723488150T R40 R16
4
43 2 RES 47 OHMS 0603 5% 723488470T R46 R151
44 4 RES 150 OHMS 0603 1% 723481117T R5 R79 R80 R9
5
45
46
47 10 RES 1K 0603 1% 723481200T
R13 R25 R41 R52 R68 R114 R125 R139 R141
R158
48 2 RELAY SMT SPDT 12V RELAY 730142 RLY1 RLY2
49 1 SWITCH TOGGLE SPDT PC MNT 2990348 S1
50 13 IC NE-5532 SO-8 DUAL OP Amp 760268
U1 U2 U3 U4 U6 U7 U11 U14 U15 U16 U17 U19
U21
51 2 IC TLV2374ID QUAD OP AMP 51155200
0
U10 U23
52 2 IC LM339 QUAD COMPARATOR 59607100 U12 U22
53 X1 IC 89S8252 MICROCONTROLLER 5115560001PS U18
54 1 IC SOCKET PLCC44 539030044 SOCKET FOR U18
55 1 IC MAX3232 RS232 DRIVER 760349 U24
56 1 IC UA7805CKTER 5V REG 760260 U25
57 1 IC 7810CKTER 10V REG 760275 U26
58 5 IC CD4053B ANALOG SWITCH 53266123T U5 U8 U9 U13 U2
0
59 4 XFMR 600:600 AUDIO 7302831 XFMR1 XFMR2 XFMR3 XFMR
4
60 1 XTAL XTAL 11.0592MHZ HC49 780196 Y1
61 1 INSULATO
R
MYLAR MS49 59225500 TO BE USED WITH Y1
62 1 PCB PRINTED CIRCUIT BOARD 750728
63 0 SCH SCHEMATIC 770952
64
A
/
R
PASTE SOLDERPASTE BE738
65 1 RES 4.7K 0603 5% 723488472T R63
LN,BE Page 3 of 5

ITEM NEW
QTY
TYPE DESCRIPTION PART NO. DESIGNATOR
This drawin
g
, written description or specification Is
a proprietary product of TELEX, Lincoln, NE, and
shall not be released, disclosed, nor duplicated
without the written permission of TELEX.
Telex Communications INC.
Lincoln, Nebraska USA
APPROVALS: DR BY: SBC
DATE: 01/25/2005
PROD:CHK: SBC
DATE; 03/04/05
APPD: JRL
DATE; 03/04/05
880125
REV LEVEL:
PCB ASSY, HB3 PLUS
TITLE:
PART NO:
A
66 1 RES 5.6K 0603 5% 723488562T R72
67 4 RES 18.2K 0603 1% 723481229T R15 R16 R122 R12
4
68 1 RES 2.21K 0603 1% 723481233T R9
LN,BE Page 4 of 5

8HB-3plus Headset Adaptor Box
6 Warranty, Service, Repair, and Comments:
Important!
Be sure the exact return address and a description of the problem or work to be
done are enclosed with your equipment.
Warranty (Limited)
All Telex Communications, Vega Signaling products are guaranteed against malfunction due to
defects in materials and workmanship for three years, beginning at the date of original purchase.
If such a malfunction occurs, the product will be repaired or replaced (at our option) without
charge during the three-year period, if delivered to the Telex factory. Warranty does not extend to
damage due to improper repairs, finish or appearance items, or malfunction due to abuse or
operation under other than the specified conditions, nor does it extend to incidental or
consequential damages. Some states do not allow the exclusion or limitation of incidental or
consequential damages, so the above limitation may not apply to you. This warranty gives the
customer specific legal rights, and there may be other rights which vary from state to state.
Factory Service Center
TELEX Communications, Inc.
Vega Signaling Products
8601 East Cornhusker Highway, Lincoln, Nebraska, 68507
Phone: [phone] Fax: [phone]
E-mail: [email protected] , Web: www.vega-signaling.com
Claims
No liability will be accepted for damages directly or indirectly arising from the use of our materials or from
any other causes. Our liability shall be expressly limited to replacement or repair of defective materials.
Suggestions or Comments
We would appreciate your input. Please send us your suggestions or comments concerning this manual,
by fax [phone]) or e-mail them to: [email protected]
Technical Support
Technical support is available by calling 800-898-6723 Monday through Friday 7:30 am to 5:00 pm
Central Time or emailing; awttechsu[email protected]
Visit our web site at www.vega-signaling.com

9
HB-3PLUS Specifications
Operating Temperature Range: 0 to 55°C for full specifications
Power Requirements: +12 to +16 VDC, semi-regulated, 500ma.
Serial Port: 9600-8-N-1 DCE Configuration
Relay Contact Ratings: 1A 125Vac - Form C Contacts
Audio Distortion: 2% THD maximum
Frequency Response: ±1.5 dB, 300 to 3000 Hz
NENA Input/Output Impedance: 600Ωnominal
Dimensions: 11” W (28CM) x 5.63” D (14.3CM) x 1.75” H (4.4CM)
TELEX Communications, Inc.
Vega Signaling Products
8601 East Cornhusker Highway, Lincoln, Nebraska, 68507
Phone: [phone] Fax: [phone]
E-mail: [email protected] , Web: www.vega-signaling.com