The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio ...
AIS Channel 1: CH87B (161.975MHZ)AIS Channel 2: CH88B (162.025MHZ)2 LED indicators for receiver channelReceiver performance:1. Receive sensitivity: -118 dBm Packet Error Rate <5%2. Intermodulation suppression 65dB 3. Adjacent channel selectivity >70dB...
aThe adjacent channel selectivity is a measure of the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of an unwanted modulated signal which differs in frequency from the wanted signal by 25 kHz. 邻近隧道选择性是接收器的能力...
The present invention offers significant improvements in the performance for a radio receiver operating in an environment with high adjacent channel interference. The present invention comprises a high selectivity RF circuit that is coupled between the antenna and the radio receiver, and filters adjacent...
The dominant culprit in degrading adjacent channel selectivity in this case, especially for narrowband channels, is phase noise. Phase noise is typically more dominant at the first LO due to the fact that its frequency is higher than that of the second LO. However, as mentioned earlier, ...
Good adjacent channel selectivity: One of the major advantages of the superheterodyne receiver is the close in or adjacent channel selectivity it offers. Using fixed frequency filters it is able to provide excellent adjacent channel rejection. By using a fixed frequency intermediate stage, fixed ...
Adjacent Channel Power ≤60dB Spurious Radiation -36dBm<1GHz; -30dBm>1GHz Vocoder AMBE Receiver Sensitivity 3%BER≤0.35µV Frequency Stability ≤±0.5ppm (without GPS); ≤±0.2ppm (with GPS) Adjacent Channel Selectivity ≥60dB Intermodulation Immunity ...
So an alternative technique is employed, to provide at least part of the required adjacent channel selectivity. This is the surface acoustic wave filter. The surface acoustic wave (SAW) filter This device, illustrated in schematic form in Fig. 2.19, utilises the fact that it is possible to ...
FM ALTERNATE CHANNEL SELECTIVITY > 70 dB AM ADJACENT CHANNEL SELECTIVITY > 35 dB AF BANDWIDTH AM: ±1 dB, 40 Hz to 15 kHz FM: ±1 dB, 20 Hz to 20 kHz FM DE-EMPHASIS 50 µSEC or 75 µSEC (User-selected) ANALOG AUDIO OUTPUTS ...
(S+N)/N = 26 dB — 3.5 — µV EMF 345 k 456 pF — 105 — dBµV EMF AM Suppression3,4,5,7 m = 0.3 — 50 — dB Adjacent Channel Selectivity ±200 kHz — 50 — dB Alternate Channel Selectivity Audio Output Voltage4,5,7 Audio Output L/R Imbalance4,7,10 Audio ...