R&S®KR420 Circulator Module/Frame

VHF/UHF circulator for the R&S®Series4200 radios

  • Overview

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

Brief Description

ATC radio stations with multiple, simultaneously operated transmitters can be subject to unwanted cross-interference which can cause transmitters to reduce their output power.

Specifications

R&S®KR420-Z1 circulator module Frequency range
VHF double circulator 118 MHz to 144 MHz
UHF double circulator 225 MHz to 400 MHz

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

Brief Description

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.

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)
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