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KR420 Circulator Module/Frame by Rohde & Schwarz

Companies & Organizations:

Germany

Rohde & Schwarz GmbH & Co KG
Muehldorfstrasse 15
81671 Muenchen


ATC radio stations with multiple, simultaneously operated transmitters can be subject to unwanted cross-interference which can cause transmitters to reduce their output power. There is also a risk that signal intermodulation products will impair radiocommunications. The R&S®KR420 circulator frame and the R&S®KR420-Z1 circulator module were developed to reduce such interference.

 

The R&S®KR420-Z1 circulator module was designed for the R&S®Series4200 radios. It consists of a VHF/UHF double circulator unit with integrated terminations and an optional VSWR meter. The module attenuates reflected signals from the antenna to the transmitter by up to 50 dB to ensure smooth radiocommunications. The actual transmit signal remains practically unattenuated.

 

The VSWR meter monitors the voltage standing wave ratio between the antenna and the circulator. The VSWR meter allows the radio to recognize any degradation in the antenna matching or an antenna failure even though the circulator is interconnected. If the VSWR exceeds a preset value (default: VSWR > 2.0), the module sends a VSWR alarm message to the radio and the radio will display a corresponding warning. The 50 Ω termination at the antenna end can absorb power levels up to 50 W and can therefore handle cases where the full transmitter output power is reflected.

 

The 3 HU 19" R&S®KR420 circulator frame can accommodate up to ten circulator modules. The 19" rack design allows the R&S®KR420 circulator frame to be installed together with the R&S®Series4200 radios in an R&S®KG4200 ATC system rack.

 

Key Facts

 

Up to ten circulator modules accommodated in a 3 HU 19" frame

40 dB to 50 dB attenuation of reflected signals

50 Ω termination for power levels up to 50 W

Optional VSWR meter

For use with the R&S®Series4200 radios in R&S®KG4200 ATC system racks

 

Specifications

 

R&S®KR420 circulator frame

Dimensions (W × H × D)                            482.6 mm × 131.8 mm × 485.5 mm

                                                                    (19.0 in × 5.19 in × 19.11 in)

Weight                                                          2.7 kg (5.95 lb)

 

R&S®KR420-Z1 circulator module

VHF double circulator

Frequency range                                         118 MHz to 144 MHz

Permissible transmit power                         100 W

Insertion loss                                               ≤ 1.0 dB

Backward isolation                                      ≥ 42 dB

UHF double circulator

Frequency range                                         225 MHz to 400 MHz

Permissible transmit power                         100 W

Insertion loss                                               ≤ 1.6 dB

Backward isolation                                      ≥ 36 dB

VHF single circulator

Frequency range                                         118 MHz to 144 MHz

Permissible transmit power                         100 W

Insertion loss                                                ≤ 0.6 dB

Backward isolation                                       ≥ 20 dB

UHF single circulator

Frequency range                                          225 MHz to 400 MHz

Permissible transmit power                         100 W

Insertion loss                                                ≤ 0.6 dB

Backward isolation                                       ≥ 20 dB

VSWR meter

Frequency range                                          100 MHz to 400 MHz

Permissible transmit power                          250 W

Insertion loss                                                 ≤ 0.1 dB

VSWR alarm message                                 when S/N > 2.0 dB

DC supply voltage                                        20 V to 40 V, from R&S®Series4200 transmitters

Termination

Frequency range                                          DC to 8.5 GHz

Permissible transmit power                          50 W

Impedance                                                    50 Ω

Alarm messages

Alarm ON                                                      ≤ 1 V DC

Alarm OFF                                                    supply voltage

Alarm threshold                                            VSWR = 2 to 3.5

                                                                     (standard VSWR = 2.3)

General data

EMC                                                              in line with EN 550 11 RE B3m

                                                                      (suppression of 2nd harmonic may be slightly lower)

Operating temperature                                  0 °C to +55 °C

Vibration                                                        in line with EN 60068-2-6

Dimensions (W × H × D)                               43.0 mm × 116.3 mm × 485.0 mm

                                                                      (1.69 in × 4.58 in × 19.09 in)

Weight with VSWR meter                             2.3 kg (5.07 lb)

Weight without VSWR meter                        1.9 kg (1.19 lb)

Defense Products & Services: KR420 Circulator Module/Frame by Rohde & Schwarz
Companies & Organizations: 
Defense Products & Services Sectors: Communication systems and equipment
Country: Germany
Description: KR420 Circulator Module/Frame
Source of Information: Rohde & Schwarz GmbH & Co KG