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Dual Rotary Attenuator for LTE Band 42 Testing

Dual Rotary Attenuator

JFW is excited to announce a new dual rotary attenuator, 50DR-141, that covers LTE Band 42. It functions from DC up to 3600 MHz. This attenuator handles up to 2 Watts of RF power. The maximum attenuation is 40 dB in 1 dB increments. The 50DR-141 has mounting holes in the front plate for easy mounting on panels for instrumentation applications. RF connector options include SMA or N.

In addition, the 50DR-141 can also be configured on 19″ Rack Panels, L-Brackets or Benchtop enclosures for use in test racks or lab environments.

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75 Ohm Electro-Mechanical Switches for CATV & VSAT

With the recent announcement of new 1P6T and 1P12T models, JFW is now able to offer an entire line of 75 Ohm electro-mechanical RF  switches for cable TV and VSAT testing applications. All models cover a frequency range of DC-2150 MHz, are self-terminating, and come standard with F female connectors (75 Ohm BNC and N also available). Full list of models include:

Looking for a solution with Ethernet, RS-232 or GPIB control? JFW will also design a custom RF test system in a 19″ rack or benchtop box with no NRE!

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Certification to the ISO 9001:2015 Standard is Complete

JFW Industries, Inc is now certified to the ISO 9001:2015 standard.  Our updated ISO 9001 certificate is available for download.  JFW has operated in a certified quality management system since 1995.  Our quality system ensures that JFW manufactures quality RF attenuators and RF switches with a documented manufacturing process and traceable paperwork.  Our commitment to our quality system reflects our commitment to providing quality RF components to our customers.

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Matrix Switch for use with 75 Ohm Network Analyzers

75 Ohm Matrix Switch

Three new 75 Ohm blocking matrix switch models have been added to the JFW website.  Model 75MS-029 is a solid-state 2X8 blocking matrix that operates 3-1000MHz.  Model 75MS-030 is a solid-state 2X6 blocking matrix that operates 3-1000MHz.  Model 75MS-037 is an electro-mechanical 2X12 blocking matrix that operates DC-1700MHz.  These 75 Ohm matrix switches can be used to fan-out connections from a 2-port 75 Ohm network analyzer to allow for automated multi-port 75 Ohm testing.  Connecting the 2X12 matrix in series with a 2-port network analyzer, creates a twelve port test set.  For all three models, the unused output ports are self-terminating at 75 Ohm impedance to keep the DUT properly impedance matched at all times.  All three models are remotely controlled via serial or TCP/IP connections.  The remote command set consists of simple ASCII formatted commands.  The remote command set for our 3.x.x firmware is available for download.  If you have any technical questions about these 75 Ohm matrix switches, please contact our engineering department for assistance.

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Identify a 2.9mm Fixed Attenuator from 2.4mm Fixed Attenuator

SMA, 2.9 mm, 2.4 mm RF connectors

With the push to 5G by wireless cellular providers, lab benches are now being occupied with a greater number of high frequency fixed attenuators with 2.9 mm (aka 2.92 mm) and 2.4 mm RF connectors.  It is important to be able to tell these RF connectors apart because 2.4 mm and 2.9 mm connectors will damage each other if mated together.  2.9 mm connectors operate up to 40 GHz.  2.4 mm connectors operate up to 50 GHz.  There are notable visible differences between SMA, 2.9 mm and 2.4 mm connectors.  SMA and 2.9 mm connectors can be mated to each other without causing damage.  Their connector threads are identical and their male/female pin diameters are mechanically compatible.  The obvious difference between a SMA female and a 2.9 mm female is the dielectric.  SMA female has PTFE dielectric and 2.9 mm has an air dielectric.  2.4 mm connectors are not compatible with SMA or 2.9 mm.  The 2.4 mm connectors have a different thread and male/female pin diameters are 56% smaller.  The RF specifications for fixed attenuators that work up to 18 GHz, 40 GHz, and 50 GHz vary greatly.  The RF specification differences can be seen with these three low power fixed attenuator models:  50HF-xxx SMA (DC-18 GHz), 50HFAR-xxx 2.9mm (DC-40 GHz), 50HFAT-xxx 2.4mm (DC-50 GHz).

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Power Divider/Combiner Types and Functionality

This application note covers resistive and reactive power divider/combiners.  The main goal of this app note is to help customers choose the correct power divider/combiner type for their application.  The functionality differences between the two types are discussed with example block diagrams.  The block diagram makes it easy to see why resistive divider/combiners are used for military radio testing.  The block diagram for reactive power divider/combiners shows how its construction is better suited for the fan-in or fan-out of RF signals to multiple devices.   If you have any questions, please contact our engineering team for assistance.

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RF Matrix Switch Types and Functionality

This application note discusses the four different construction types for RF matrix switches with pros and cons for each type.  Matrix switch types discussed:  blocking matrix switches, non-blocking matrix switches, super non-blocking matrix switches, and common highway matrix switches.  The functionality of each construction type is discussed with example block diagrams.  Please contact our engineering department directly if you have any questions or requests.

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