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R&S®FK4120/FK4140 Digitally Tuned HF Selectors

To R&S®M3SR Series4100 Software Defined Radios
  • Overview

Key Facts

  • Five-circuit lowpass filter (0 Hz to 1.5 MHz) for receive frequencies below 1.5 MHz
  • Automatic tracking in both receive and transmit modes

Brief Description

The R&S®FK4120/FK4140 digitally tuned HF selectors are optional plug-in modules for the radios of the R&S®M3SR Series 4100. They increase the selectivity of the transmit and receive paths.

Key Facts

  • Five-circuit lowpass filter (0 Hz to 1.5 MHz) for receive frequencies below 1.5 MHz
  • Digitally tuned tracking bandpass filters (1.5 MHz to 30 MHz) with 20 dB or 40 dB edge steepness at 10 % frequency offset
  • Automatic tracking in both receive and transmit modes
  • Input voltage protection up to 200 V (Vrms)
  • Frequency hopping capability in line with R&S®SECOM-H

Brief Description

The R&S®FK4120/FK4140 digitally tuned HF selectors are optional plug-in modules for the radios of the R&S®M3SR Series 4100. They increase the selectivity of the transmit and receive paths. Receiver parameters such as 2nd and 3rd order intercept, IF rejection, image-frequency rejection and crossmodulation immunity are significantly improved. In the transmit direction, the TX phase noise is suppressed to produce typical values as low as –165 dBc/Hz.

These digitally tuned HF selectors are recommended if you need to receive low-amplitude signals in the simultaneous presence of strong HF carrier signals. This is the case when multiple HF radio lines operate simultaneously and independently of one another and reception should be possible even if adjacent lines are transmitting.

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