Kenwood TS-590SG Manual

Also see for TS-590SG: Reference guide Setting manual Setting manual Instruction manual Instruction manual

Contents

01 RECEPTION101.3 Up-ConversionDifference of characteristics due to the pass bandwidth in the roofing filter can be viewed in graphs in Figure 1-5 andFigure 1-6. So, lets see the characteristics of the up-conversion system in which the same front end configuration is usedas previous models. We will explain using the measurement result that compares the dynamic range characteristics ofTS-590S and of previous models in the 50 MHz band.Figure 1-7 Dynamic Range in the 50 MHz BandMeasurement Conditions:ReceiveFrequency 50.200 MHzMode CWPass bandwidth 500 HzPRE AMP OFFComparison target TS-480HX/SAT (equipped with YF-107C CW filter)(The measurement method is the same as that was applied to 14.2 MHz.)In the 50 MHz band, the signal is received with up-conversion on both the TS-590S/SG and the TS-480HX/SAT. If theseparation between the target signal and the interfering signal drops below 20 kHz, the dynamic range decreases on bothtransceivers. However, on the TS-590S/SG, the outcome is improved for 15 dB even within the pass bandwidth of the MCF.This is thanks to the drastic modification of circuitry of the up-conversion section that was reviewed coupled with the down-conversion path being added.The same circuit is also used in WRC bands and in general coverage receiving as well as in the 50 MHz band, and thereforethe equivalent performance improvement is made in those bands.1.4 RX Auxiliary CircuitsTypical built-in RX auxiliary circuits include the variable pass bandwidth circuit, notch filter and noise blanker (NB). Inmodern HF transceivers, most of these auxiliary circuits (= auxiliary functions) are made possible by an arithmetic processof the DSP. As well as the TS-590S/SG, only two auxiliary circuits operate genuinely at the IF stage: NB and AGC (ATTcircuit that functions by receiving the control signal provided by the DSP).On the TS-590S/SG, there are two methods available to achieve noise blanking: NB1 and NB2. NB1 is realized by analogprocessing and NB2 by digital processing of the IF DSP. Still retaining an analog noise blanker, TS-590S may seem out ofstep with the times. But it is critical to have an analog noise blanker for a receiving system design using narrow roofing filters.