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12 Port Divider Combiner for 75 Ohm Coax Network Testing

JFW model 75PD-188 F is a 11-way resistive divider/combiner that covers the frequency range DC-2150 MHz.  It has 75 Ohm F female RF connectors.  The unit has 12 total ports that are internally connected using a resistive star configuration.  This design is ideal for testing 75 Ohm cable equipment that needs to communicate with each other over a 75 Ohm coax network.  The star design is bidirectional allowing multiple 75 Ohm devices to communicate with each other with equal loss between all devices.  Use JFW’s precision F male/male RF cable model 016-910-xx to connect the devices with minimum VSWR.

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Python Library Available for USB Attenuator and USB RF Switch Models

python attenuator library

If you would prefer to control our USB attenuator or USB RF switch models using Python instead of our standard Windows based GUI test program, JFW does offer a Python library (jfwusb.py).  Email our engineering department for the Python library and examples.

Python Library Features:

  • Auto-discovery of any JFW USB devices connected to the computer.
  • Set persistent device names for each attenuator.
  • Set/read attenuator by its device number.
  • Set/read attenuator by its serial number.
  • Set/read attenuator by its user defined name.
  • Set all attenuators to the same dB value, min dB value, or max dB value.
  • Set/read RF switch by its device number.
  • Set/read RF swich by its serial number.
  • Set/read RF switch by its user defined name.
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    4 Channel Attenuator Assembly Covering 100 MHz to 18 GHz

    4 channel attenuator assembly

    JFW model 50BA-032-31 SMA is a 4 channel attenuator assembly that covers 0.1-18 GHz.  Each channel consists of a solid-state programmable attenuator with attenuation range 0 to 31dB in 1 dB steps.  Each attenuator can be controlled individually or as a group.  This benchtop attenuator assembly is remotely controlled via Ethernet/RS-232 and manually via momentary toggles on the front panel.

    The current attenuation setting for each attenuator is displayed on the front panel.  Whether the attenuators are changed by a remote user or manually, the attenuation displayed will be updated immediately.  This is very useful when running remote scripts so that you can see that attenuator settings changing as the script executes.

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    Introduction to Programmable Attenuator Systems

    Introduction to Programmable Attenuators

    The application note is an introduction to programmable attenuators and their applications.  If you would like to discuss your application with our engineering staff please call (1-317-887-1340) or email.

    Applications for Programmable Attenuator Systems

    • Military radios
    • First responder networks
    • Wi-Fi/MU-MIMP
    • Cellular networks
    • Mesh networks
    • IoT and 5G systems

    Key Programmable Attenuator Specifications

    • Frequency range
    • VSWR
    • Attenuation range and step size
    • Impedance
    • RF input power
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    18 GHz Step Attenuators w/ TTL, USB, or Ethernet Controls

    18GHz Step Attenuators

    JFW is proud to announce the addition of a new line of 18 GHz step attenuators to our product line.  These new 50 Ohm solid-state step attenuators cover 100 MHz to 18 GHz with an attenuation range of 0-31 dB by 1dB steps.  The attenuators can handle up to +20 dBm of RF input power.  We offer these attenuators as individual components or as an integrated RF test system.

    Model #50P-2061
    TTL controlled step attenuator, 0.1-18 GHz, 0-30 x 1dB steps
    Model #50P-2068
    USB controlled step attenuator, 0.1-18 GHz, 0-30 x 1dB steps
    Model #50BA-030-31
    Ethernet attenuator assembly with (1) step attenuator, 0.1-18 GHz, 0-30 x 1dB steps
    Model #50BA-031-31
    Ethernet attenuator assembly with (2) step attenuators, 0.1-18 GHz, 0-30 x 1dB steps
    Model #50BA-032-31
    Ethernet attenuator assembly with (4) step attenuators, 0.1-18 GHz, 0-30 x 1dB steps

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    Introduction to JFW’s USB Attenuator Test Software

    Why use a USB Attenuator?

    In RF test labs, programmable attenuators and RF switches are a basic building block of performance testing. Programmable attenuators are used in fading, handover, and rate vs range testing. Among other things, RF switches are used in signal routing, component bypassing and switched filter banks. To fill this need, JFW offers an expansive selection of Programmable Attenuator Assemblies and RF Switch Assemblies in 19″ rack or benchtop enclosures. These boxes typically include Ethernet and RS-232 control. While appropriate for medium to large testing environments, a USB Attenuator or USB RF Switch is often a better solution for smaller test setups. Lower cost and smaller size of the USB device are especially relevant.

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