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Digital TDD - OFDM Portable Transceiver GPS Security Wireless Communication

Categories Portable Base Station
Brand Name: LinkAV
Model Number: TJ340-5W
Certification: CE Applicable
Place of Origin: China
MOQ: 1
Payment Terms: L/C, T/T, Western Union, MoneyGram
Supply Ability: 1000pcs/month
Delivery Time: 20 Days
Packaging Details: Standard Export Packaging
System: PAL/NTSC
Type: Base Station
Working Frequency: 300MHz-800MHz
Modulation Type: TDD-OFDM
Display: 14 inches HD display
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Digital TDD - OFDM Portable Transceiver GPS Security Wireless Communication

Digital TDD - OFDM Portable Transceiver GPS Security Wireless Communication

Portable Base Station​ Introduction:
Using the TDD method, a single frequency channel is assigned to both the transmitter and the receiver. Both the uplink (UL) and downlink (DL) traffic use the same frequency f0 but at different times.

In effect, TDD divides the data stream into frames and, within each frame, assigns different time slots to the forward and reverse transmissions. This allows both types of transmissions to share the same transmission medium (i.e., the same radio frequency), while using only the part of the bandwidth required by each type of traffic.

Several inferences can be drawn from this description:

  1. Since the TDD scheme can allocate dynamically the amount of time slots assigned to each direction -- transmit and receive-- an operator can define the percentage of UL versus DL traffic. This is especially important for Internet-type traffic (the ratio for UL/DL is no longer constrained to a fixed 50/50).
  2. A guard band is not required to separate the UL and DL channels, because they both use the same frequency – hence, there is no loss in spectrum. A guard period, though, is necessary for synchronization purposes and to accommodate the turnaround time and the round trip delay whenever switching transmission from DL to UL, and vice versa.
  3. Because the UL/DL allocation is dynamic, there is very little waste of spectrum for asymmetric operations, i.e., last-mile applications, where typically the UL traffic is a fraction of the DL traffic. (Some spectrum is still lost for the guard periods, but this is negligible compared to the total length of data in a time slot).

Portable Base Station​ Product Features:

  1. Inserted modular functionalized, data transmission and display integration
  2. Stable power and adjustable dynamic power
  3. Support 8 channel video decoding, built-in soft matrix, data storage
  4. Single carrier frequency support up to 4 simultaneous users two-way data transmission
  5. Encryption: AES 128 bit, flexible power supply
  6. Built-in microphone for phone talk and PTZ control.

Portable Base Station Technical Parameters:



RF Parameter

Working Frequency


Modulation Bandwidth

2 / 4 / 8MHz

Modulation Type


Communication Mode

TDMA Full Duplex

Power Output


Band Flatness

≤ ±0.5dB

Spurious Spectrum

≤ -36dBm

Third-order IMD

≤ -36dBC

Receiving Sensitivity

≤ -100dBm


≥ 36dB

Anti-adjacent Frequency Interfere

≥ 40dB


Synchronization Control

GPS/Beidou with Synchronized clock

Transmission Bandwidth

Up to 14Mbps

Network Protocol


Business Unit

Video Decoder

8-channel D1 or 4-channel 720p video decoding(similar to Matrix)


14 inches HD display

Voice Communication

Built-in amplifier speakers ,sound pick-up ( more than 10 meters )

Data Storage


Generic Specification

Working Temperature

-30 ~ +70°C

Working Voltage

DC12V Battery (work for 3 hours)

Power Consumption




Net Weight



Power Interface

DC Head

Data Connector


Network Interface


RF Antenna Terminal

NF Female

Can be applied to public security, fire fighting, armed police, military defense, police law enforcement, environmental monitoring, emergency rescue, water and flood control, power rescue, maritime inspection, customs border, terminal monitoring, especially suitable for urban, sea, mountain and other complex environments to realize high-quality real-time mobile transmission.

Topological graph:

About LinkAV:

LinkAV was founded in 2005 to provide wireless microwave products for video and data transmission, for over 12 years, LinkAV has been designing and manufacturing a portfolio of leading edge technology systems that serve a diverse, high quality customers base within the government safety surveillance, police law enforcement, military command, UAV,UGV and broadcast end markets etc.

The high performance video surveillance, communications and broadcast systems enable our customers to securely monitor, communicate and share information with confidence in complex environments and in the most demanding situations.

As a leader in real-time COFDM microwave transmission, LinkAV has built up a strong foundation with extensive experience supporting customers around the world. With a strong network of business partners around the globe.

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