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
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