Icom IC-9100 HF/ VHF/ UHF Transceiver
Double conversion superheterodyne
Icom' s basic idea about the best receiver circuit is to reproduce high
fidelity audio without internal distortion. Our answer to achieve this
goal is to adopt a double conversion superheterodyne system* . The
double conversion system simplifies the electronic circuitry and reduces
the number of components which cause internal distortion. The digital
signal processing ( DSP) technologies and image rejection mixer make it
possible to adopt this system.
* A triple conversion system is used for the 1200MHz band.
Independent dual receivers
As 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) . One each for HF/ 50MHz, 144MHz, 430/ 440MHz bands.
See the table below for simultaneous receive pairs.
AGC loop management
Digital IF filters, manual notch filter and other digital functions are
incorporated in the AGC loop management controlled by the DSP unit. The
AGC effectively works for the desired signal and rejects blocking by
strong adjacent signals out of the filter passband. The AGC time
constant presets ( slow, medium and fast) give the flexibility and speed
needed for working pile-ups.
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