The ADT-200A is world's first amateur radio transceiver with completely digital signal processing. The device is equipped with the latest DSP technology, moreover it is produced professionally with state-of-the-art technology.The software algorithms for the signal processing have been carefully developed and have been optimized several times. Tests show that the ADT-200A can keep up with even the best commercial receivers regarding selectivity, sensitivity and intelligibility.
As a novelty, the transmit signal is processed by adaptive predistortion, a technique that is used for the first time in amateur radio. This technology stands out due to high efficiency and a remarkably clean transmit spectrum, combined with an exceptionally clear modulation.
The spectrum analyzer is available as a PC program. The display range extends from 10kHz up to 2MHz. This equally allows narrowband analysis of transmit spectra as well as monitoring of whole bands. A dynamic range of >120dB and an accuracy of ±1dB make this option a measuring instrument.
What is the Difference between an All-Digital and a conventional Receiver?
Most of today's conventional receivers are based on the tripple conversion concept. More often, DSP's are placed in the third IF stage. The most important performance criteria like intermodulation, reciprocal mixing, blocking and the selectivity of roofing filter can no longer be influenced by the DSP, because these parameters are already determined in the preceding analog stages. Due to the large number of components, it is difficult to achieve tight performance parameters during mass production.
In the digital receiver the full signal spectrum is fed directly to a high-resolution A/D converter. All signal processing is made digitally, which is ideal as it relates to distortions and noise. Since algorithms are determined by software, uniform performance parameters are obtained. Another benefit of this technology is the high degree of functional flexibility. New functions can be added by simple software download.
The Highlights of the ADT-200A
Receiver
- Receiver with very clean, low-noise audio reproduction
- 4 receivers with independent frequency selection, one is reserved for the Spectrum Analyzer
- Automatic fine tuning for AM and CW via push button
- Several noise blankers eliminate even extreme impulses
- Linear S-meter with an unbelievable range of -148dBm up to +17dBm and a typical error of ±1dB
Transmitter
- Adaptive Predistortion allows a PA efficiency of up to 70% and results in a very clean modulation
- Low distortion voice enhancer replaces the legacy speech compressor
- Clean output spectrum with an intermodulation ratio of >45dBc
- Calibrated VSWR- and power meter working from 100mW
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