Communication Systems

TruLink System Basics

TruLink is a digital, wireless, voice Intercommunication System (ICS) used as a stand-alone solution for short range communication between a group of users, or to provide a wireless extension to an existing wired intercom system. The TruLink System enhances communications and increases operator safety where mobility and clear communications are critical by offering talk-through capability to multiple long-range radios in either the stand-alone or integrated (with existing wired ICS) configuration.

The most versatile full-duplex wireless intercom in the world today, TruLink operates reliably in high noise environments, and provides resistance to shock, vibration, moisture, dust and extreme temperatures.

The key component of the system is the user-worn TruLink Portable Transceiver (TPT) used in conjunction with a standard 4-pin NEXUS headset. An optional TruLink Access Point (TAP) or Dual Port Transceiver (DPT) can be incorporated as part of the system enabling talk-through connection for up to three long-range radios.

TruLink is not a "walkie talkie". It is an intercommunication system featuring the following:

TruLink utilizes a frequency hopping, spread spectrum modulation technology resistant to jamming and detection. The transmission frequency is a 2.4 GHz, license-free band enabling operation without a license. The maximum transmission power level is 100mW, enabling communication up to 500 meters line-of-site. The system offers 50 independent nets. Each net can support 31 participants with simultaneous speech or conference for up to 6 operators.

To participate in a specific conference group, each user sets their TPT to the designated channel. A channel has a unique hop-set of frequencies and a defined frequency-hopping sequence.

Each channel has one TruLink device, TPT, TAP or DPT, pre-assigned as the "Master". This is where all voice communication, on the channel, is combined and retransmitted to every user on the network. When included in a configuration, the TAP or DPT becomes the default Master. Any of the TPTs can be user-set as the default master for configurations not including a TAP or DPT.

TruLink utilizes digital signal processing techniques and algorithms, minimizing or eliminating the effects of interfering frequencies, radio fading, and high ambient noise fields. System functionality can easily be upgraded by reprogramming flash memory.

TruLink System Components

TruLink Portable Transceiver (TPT)

The TruLink Portable Transceiver (TPT) is a user-worn device compatible with most standard 8 OHM - 600 OHM headsets with a 4 pin Nexus U-174 plug. The headset is plugged directly into the base (J-box) of the TPT. Once the TPT is set-up, the user simply talks allowing communication through the headset. Turn ON/OFF, and functionality changes (such as channel selection) of the TPT are implemented via five large ergonomically designed multi-function buttons. Menu status and selection is accomplished with simple voice prompts through the headset, as the unit purposely has no display.

Button	Function
	Raise volume
	Lower Volume
M	Menu selection via voice prompts
*	Change/cycle through a selected menu item
PTT	Provides multiple functions: - Used as the "Enter" key for a selected menu feature - Provides Push-to-Talk for connections to long range radios - Emergency break-through if network is saturated with max users.

Three standard Alkaline or NiMH rechargeable AA batteries power the TPT. The battery compartment is easily accessed without tools by turning a thumbscrew on the back of the unit and opening door. An integrated clip provides easy fastening to user clothing, and optional TPT pouches can be purchased for additional attachment options.

TruLink Dual Port Transceiver

TheTruLinkDual Port Transceiver (DPT) is for a Portable interface to a wired ICS. When connected to the wired system it acts like a TAP and is the network Master by default. Depending on configuration, the DPT may also be used as a handheld unit with connection to a headset. The DPT connects to the wired ICS system via a Platform Interface Cable (PIC) providing the appropriate connector type and impedance matching. Like the TPT, the DPT is powered from three Alkaline or NiMH AA batteries

TruLink Access Point (TAP)

A TruLink Access Point (TAP) is required for a Permanent interface solution. Used when the operators carrying the TPT need to connect to other networks not supported by a TPT connection. The TAP can be directly connected to a number of long-range radios and to an existing hard-wired intercom such as a vehicle, vessel or airborne platform, and is powered by the vehicle platform. The TAP is the "Master" in a TruLink network by default and can accommodate up to three radio assets. A TPT has the ability to wirelessly access any of the communication assets connected to the TAP.

TAP Connection Direct to Long-Range Radios

A TAP is used when the TruLink network needs to connect to radio or intercom assets. The individual TPT user has the capability to select and communicate over any of up to three radios connected to the TAP.

TAP Connection to Wired Intercom System

One of the TAP audio ports can be connected to a wired intercom system through a crew station, or a radio port input of the wired ICS system. The TAP can interface to the headset port of the ICS crew station or spare radio port. Note that an interface to the wired ICS system will utilize only one of the three TAP ports.

TruLink Support Station

The TruLink Support Station (TSS) enables simultaneous battery charging for up to 6 TPTs, and display the built-in-test status of each. In addition to battery charging and bit monitoring, the TSS has the capability to configure the channel setting of all TPTs installed. An LED display and keypad allow the selection, setting and display of channel configurations allowing quick configuration of the conference group. The TSS is shipped with a standard 115V AC line voltage cord.

Getting Started - I just received my TruLink equipment

1. Verify all TruLink components for your application is correct, to include cables and headsets.
2. Verify correct configuration. The configuration is the CF number on the label. All TruLink TPT, DPT, and TAP must have the same CF number.
3. Set battery type switch to the correct position for your battery.
   1. a. Default is Alkaline
4. If using AA Alkaline batteries, ensure they are new.
5. If using AA NiMH, ensure they are fully charged prior to use.
   1. A full charge will take ~3hrs when using the TruLink Support Station.
   2. All NiMH will have some residual charge off the shelf. This is not a full charge. Do not install these batteries in the TPT until you are ready to fully charge them.
6. Do not store any battery in the TPT in excess of one week.
   1. Support Station should be used for storage when NiMH batteries are installed ensuring full charge of batteries.
   2. Support station must be turned on.
7. Create a TruLink as a standalone network. Refer to TruLink manual for setting up networks.
8. Verify clear audio communication in a standalone configuration prior to integration with wired ICS.

TruLink Configurations

Although all TruLink hardware is basically the same, the configurations will vary depending upon the desired functionality of the wireless system, and the types of headsets used with the TPT. Interconnecting cabling to a wired ICS varies depending upon the type of ICS and functionality desired.

The software configuration can be found embedded in the part number label on the equipment. Note that TruLink equipment must have the same configuration number to interoperate. A complete list of each TruLink Configuration is located on our Quick Reference Guide page.

TPT Syn-Voice Menu Tree

Syn Voice Announcement	Function	Comments
Channel XX	Current channel (0-49)	Always available
Slave or Master	Mode	Available when not logged on
VOX ON	Hands free operation	Available after LOG on OK
User Type	Current User Type 1, 2, 3	Always available
Key Lock Off	Buttons on TPT disabled	Available after LOG on OK
LED Normal	LED operation (Normal, High, NVG, Timed, OFF)	Available after LOG on OK
Order Change Master	Redirects Master to TPT that made change	Available after LOG on OK
Order Synchronize Access Point	Change channel TAP if in the Network	Always available

User Type Functionality

Mode	Monitor Other TruLink Wireless Users	Transmit to Other TruLink Wireless Users	Monitor Wired ICS	Transmit to Wired ICS
User Type 1	Yes	VOX or PTT	Yes	PTT
User Type 2	Yes	VOX or PTT	Yes	VOX or PTT
User Type 3	Yes	VOX or PTT	No	No

User Type 1 - Common User Type utilized by a commander who requires monitoring a wireless crew while also monitoring communications taking place over the wired system. VOX communication goes to the wireless crew only. Commander transmits communication to the wired ICS by pressing PTT -wireless crew does not hear this communication.

User Type 2 - This User Type facilitates a fully integrated wired and wireless intercommunication system. TruLink crew member hears and transmits (via VOX or PTT) to other crew members weather they're on the TruLink wireless or wired ICS system.

User Type 3 - Common User Type used during VIP transport. VIP's use TruLink for private communication between each other. VIP's cannot communicate (transmit or receive) to crew-member on the wired ICS.

TruLink Configuration Manager

The TruLink Configuration Manager (Part Number 015.0126-00) provides the capability to replicate, load and change the software configuration of a TruLink TPT or TAP. The Configuration Manager includes appropriate cables, power supply and programs needed to modify the TruLink software along with the TruLinkLoad Tool, TruLinkClone Tool and TruLink Configuration Tool.

TruLink Load Tool

- The Load tool allows the user to update TruLink TPT, DPT, and TAP devices with completely new software load.

TruLink Configuration Tool

- The Configuration tool allows the user to make configuration changes to the TPT, DPT, and TAP TruLink devices. Only specific versions of the TruLink system support the Configuration tool. Consult the appropriate application specific User Manual Addendum.

TruLink Clone Tool

- The Clone Tool allows the user to create a TruLink configuration CD. When used with the Configuration Tool, a user can create a custom configuration CD that may be loaded directly onto other TruLink devices using the TruLink Load Tool.

TruLink Accessories

Item	Part Number	Description	Comments
Dual Port Transceiver (DPT) Accessories
1a	JB6856-M3	Platform Interface Cable (PIC)	For DPT connection to ICS. Mates directly to PT06A bulk head connector.
1b	JB6856-Mx	Platform Interface Cable (PIC) - flying lead	For DPT connection to ICS. User Installs appropriate mating connector
1c	CC6658-M7	Dual Port Transceiver Channel Select Cable	For Changing DPT channel (one recommended per DPT)
TAP Accessories
2a	780-4000-001	TAP Audio Interface Cable J1	Pre-built for TAP J1 - Flying leads at open end. Neoprene Rubber coated Insulator. Not flight approved.
2b	780-4000-002	TAP Audio Interface Cable J3	Pre-built for TAP J3 - Flying leads at open end. Neoprene Rubber coated Insulator. Not flight approved.
2c	780-4000-003	TAP Audio Interface Cable J5	Pre-built for TAP J5 - Flying leads at open end. Neoprene Rubber coated Insulator. Not flight approved.
2d	780-5000-001	TAP DC Power Cable	Pre-built for TAP J7 - Flying leads at open end. Neoprene Rubber coated Insulator. Not flight approved.
3	AN6832-M1	Standard Antenna (replacement part)	Included with TPT, DPT, TAP.
4	33TNC-SMA-50-1	TAP Antenna Adapter (replacement part)	Included with TAP.
5	780-3000-001	TruLink Support Station (TSS)	Charge up to 6 TPT's simultaneously. Performs BIT check and channel change.
5a	780-3500-001	TSS AC power cable (replacement part)	Included with TSS (Item 5).
6	015.0126-00	TruLink Configuration Manager	Tool to update TAP, TPT, and DPT SW. Includes SW, interface cables, power source, and carrying case.

Key TruLink System Specifications:

TruLink Portable Transceiver (TPT)

DESCRIPTION	VALUE
FREQUENCY	2.4 GHz ISM band
RF POWER OUTPUT	100 mW (default)1 - 100 mW factory programmable
RANGE	Up to 1500 ft. (line-of-sight)
DIMENSIONS	L4.8/W2.9/D1.9 inches
WEIGHT	11 oz. (with 3 AA batteries)
OPERATING TIME	8 Hours min (3 AA batteries)
PHYSICAL CHANNEL SPACING	300 KHz
3 dB PHYSICAL CHANNEL BANDWIDTH	192 KHz
MODULATION	Π/4 DQPSK
PHYSICAL CHANNEL BIT RATE	384 Kbps
SPEECH ENCODING	32 Kbit/sec ADPCM
NUMBER OF CHANNELS	50
NUMBER OF USERS PER CHANNEL	31
NUMBER OF SIMULTANEOUS SPEAKERS	Up To 6
SPREAD SPECTRUM	Frequency hopping/50 Hops per Second
OPERATING TEMPERATURE	-20°C to +55°C

TruLink Access Point (TAP)

DESCRIPTION	VALUE
FREQUENCY	2.4 GHz ISM band
RF POWER OUTPUT	100 mW (default)
RANGE	Up to 1500 ft. (unobstructed line-of-sight)
DIMENSIONS	L8.7/W5.7/D2.3 inches
WEIGHT	2.9 lbs
POWER	9-33 VDC 1A fuse required
PHYSICAL CHANNEL SPACING	300 KHz
3 dB PHYSICAL CHANNEL BANDWIDTH	192 KHz
MODULATION	Π/4 DQPSK
PHYSICAL CHANNEL BIT RATE	384 Kbps
SPEECH ENCODING	32 Kbit/sec ADPCM
NUMBER OF CHANNELS	50
NUMBER OF USERS PER CHANNEL	31
NUMBER OF SIMULTANEOUS SPEAKERS	6
SPREAD SPECTRUM	Frequency hopping/50 Hops per Second
OPERATING TEMPERATURE	-40°C to +55°C