**Frequency Division Multiplexing**
Frequency division multiplexing (FDM) is a traditional technique used to transmit multiple signals over a single communication channel by dividing the available bandwidth into distinct frequency bands. This method is widely applied in broadcast HFC (Hybrid Fiber-Coaxial) networks, where both analog and digital TV signals are transmitted. Even for digital TV, although each channel (typically 8 MHz wide) uses time-division multiplexing internally, the overall transmission still relies on frequency division multiplexing to separate the channels.
Orthogonal Frequency Division Multiplexing (OFDM) is a more advanced form of multi-carrier modulation. In OFDM, all subcarriers are spaced at equal intervals and are orthogonal to each other, which means their spectra do not interfere. This allows for efficient use of the spectrum without the need for guard bands between individual carriers. OFDM systems can dynamically allocate data across subchannels, optimizing performance by sending more data through channels with less noise. OFDM is now widely used in modern communication systems, including ADSL, DVB, HDTV, WLAN, and 4G networks.
**Understanding Frequency Division Multiplexing**
Figure 1(a) and (b) illustrate the basic principle of FDM using three voice signals as an example. The low-pass filter (LPF) limits the bandwidth of each signal, typically to 3.4 kHz for voice. After modulation, the upper sideband is added, and the resulting spectrum is shown in Figure 1(c). A second modulation shifts the combined spectrum to a higher frequency band for transmission.
At the receiving end, a bandpass filter isolates the desired signal, removing out-of-band noise. The signal is then demodulated, split into its original frequency bands using bandpass filters, and finally demodulated back to baseband. As shown in Figure 1(c), there is a guard band between the frequency channels to prevent interference from adjacent channels. This composite system ensures that each signal is clearly separated and recovered without cross-talk or distortion.
**Concept of Frequency Division Multiplexing**
In simple terms, frequency division multiplexing is a technique that allows multiple signals to be transmitted simultaneously over a shared channel by assigning each signal a unique frequency band. The channel's total bandwidth is divided into non-overlapping segments, and each segment carries one signal. At the receiver, bandpass filters are used to extract each individual signal based on its assigned frequency.
The process begins with each baseband signal being filtered to avoid spectral overlap and aliasing. Each signal is then modulated onto a different carrier frequency, combined, and sent through the channel. On the receiving side, the signals are separated using filters tuned to the respective frequencies, and then demodulated to recover the original information. This method ensures clear and efficient transmission of multiple signals without interference.
2.54mm Wire To Board Connectors
2.54mm Wire To Board Connectors are avialable in different terminations and sizes intended for use on a variety of applications. These connectors provide power and signal with different body styles, termination options, and centerlines. To find the wire to board set required, click on the appropriate sub section below.
2.54mm(.098") Wire to Board Connector
Provide a variety of PIN and Size, Right Angle or Straight Type, DIP or SMT, Dual or Single Row Wire to Board Connector for industry-specific LCD screen, Communications products, Computer peripheral notebook computer micro-electrical equipment, communications equipment, lighting products, there are a widely range of uses can be use
2.54mm(.098") Wire to Board Connector Specification
Current rating:3A AC DC
Voltage rating:250V AC DC
Temperature rating:-25°C~+105°C
Contact resistance:20mΩ max.
Insulation resistance:1000MΩ min.
Withstanding voltage:1000V AC/min.
Circuits available ::02-18PIN
Contact : :Brass or Phosphor bronze
Electronic rating ::250V/3A
Finish ::Plating Tin or Gold over Nickel
Material ::Nylon UL 94V-0 or UL 94V-2
180° HEADER
90° HEADER
2.54mm(.098") Wire to Board Connector Key Features
2.54MM wire to wire and wire to board connector.
Single Row 180° DIP / 90°DIP / 180° SMT / 90° SMT
Applicable wire AWG #28~ #24
Alternative with Molex products
Lead-Free ROHS & REACH
2.54mm(.098") Wire to Board Connector Applications
Automotive, Communications & Networking, Consumer Electronics, Lighting, Medical
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ShenZhen Antenk Electronics Co,Ltd , https://www.antenk.com