BackThe DSP-Receiver KWZ 30 is a shortwave receiver for the 50 KHz to 30 MHz range, high dynamic range and DSP in the IF. Conventional receivers with a comparable dynamic range and intercept value IP3 did not use the DSP principle, which was available only in professional and therefore very expensive equipement. That has changed now.
The KWZ 30 is a semi-professional machine for the dedicated shortwave and radio amateur. Its performance will satisfy the highest expectations. This is achieved by an front end (mixer) with an IP3 of +30 dBm in conjunction with an extremely low-noise oscillator system and a digital IF section using the DSP principle.
The DSP concept brings with it some outstanding properties in selection and demodulation. The filters responsible for selection have extremely steep skirts and almost no passband ripple. They are also phase-linear, so that all signal components maintain their time relations. This leads to a clear, unaffected sound in AM and SSB and signals free of interference in CW.
The filters are purely a software solution in the DSP. Therefore it is possible to realize a large number of filters. The KWZ 30 features filters for all modes of operation, from 50 Hz bandwidth for EME or CW up to 9 KHz for AM medium- or longwave reception.
The DSP also handles the demodulation of the signals. Different programs are activated depending on the mode. The linearity and therefore the quality no longer depends on the quality of physical components but on the accuracy of computation - bringing about a new level of quality impossible to achieve with analogue technology.
An important objective during the development of the KWZ 30 was to keep the number of controls as small as possible without limiting the variety of adjustable parameters. The controls could be reduced to a minimum: