It is useful for for breaking through the noise and complete the QSO. The digital RF speech compressor boosts average talk power, improving signal strength and readability in SSB mode. The noise blanker allows you to change the threshold level as well as blank duration parameter and attenuation level. The digital noise blanker reduces interference from pulse-type noise such as engine ignition. The 16-step variable noise reduction can significantly enhance the receiver's signal-to-noise ratio, giving you a clean, clear audio signal that may make the difference between making the contact or not. Three filter memories allow you to change filter settings instantly, a great help during contesting or other tough conditions.ĥ0Hz–500Hz (50Hz step), 600Hz–3600Hz (100Hz step)ĥ0Hz–500Hz (50Hz step), 600Hz–2700Hz (100Hz step)Īfter “building your own” digital IF filter, you can use the digital twin Passband Tuning (PBT) to shift and narrow the IF passband until the interference is gone and you can clearly hear that weak signal. You can quickly choose bandwidth, shape factor, and center frequency, so that you can work that rare DX station. The IC-9100 DSP allows you to “build your own” digital IF filter. The AGC time constant presets (slow, medium and fast) give the flexibility and speed needed for working pile-ups.
The AGC effectively works for the desired signal and rejects blocking by strong adjacent signals out of the filter passband. AGC loop managementĭigital IF filters, manual notch filter and other digital functions are incorporated in the AGC loop management controlled by the DSP unit. This powerful combination supports many digital processing features. The heart of the IC-9100 is the proven combination of the 32-bit floating point DSP and 24-bit AD/DA converters. See the table below for simultaneous receive pairs.ģ2-bit floating point DSP & 24-bit AD/DA converters * A triple conversion system is used for the 1200MHz band.Īs seen in the above figure, the IC-9100 has 3 independent receiver circuits from the antenna connector to the second IF mixer (image rejection mixer). The digital signal processing (DSP) technologies and image rejection mixer make it possible to adopt this system. The double conversion system simplifies the electronic circuitry and reduces the number of components which cause internal distortion. Our answer to achieve this goal is to adopt a double conversion superheterodyne system*. Icom's basic idea about the best receiver circuit is to reproduce high fidelity audio without internal distortion.
The All-round Transceiver, IC-9100 Double conversion superheterodyne
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