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Limited Fan-out

Whether you are fading multiple base station signals to a handset or testing multiple communication standards with wireless devices, JFW has a handover test system to help automate your RF testing.

JFW’s limited fan-out configuration (LC) handover test systems are scaled down versions of our full fan-out handover test systems. These limited fan-out models have individually controlled programmable attenuators on the input ports. All of the input signals are summed together and then split up to all of the output ports. This type of construction allows an input signal to be available to all output ports at the same attenuation level. Because the limited configuration models use fewer RF components than the full fan-out models, the cost of the limited configuration models is lower. Example block diagrams are located below the model selection table.

If you do require an input signal to be available at multiple output ports at different signal levels, then you will need to use one of our full fan-out handover systems.

Below is a sortable table containing our online limited fan-out configuration handover test system models. If you can???t find a model that meets your requirements, please contact us. One of our engineers will work with you to pick out an existing model or design a custom model for your application. JFW does not charge NREs and our pricing for custom models is in-line with our catalog models.

Click the column headers to sort our online models. For your specific application, please contact JFW for assistance or use our Inquiry Form.

JFW Model #ImpedanceConfigurationdB TotaldB StepFrequency StartFrequency StopControlRF Connectors
50BA-007-9550 Ohms2 x 1 LC Handover System95 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232SMA Female
50PA-102150 OhmsDual 4 x 1 LC Handover System95 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-56150 Ohms4 x 4 LC Handover System63 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232SMA Female
50PA-62250 Ohms8 x 2 LC Handover System127 dB1 dB700 MHz3000 MHzManual, Ethernet, RS-232N Female
50PA-64350 Ohms4 x 1 LC Handover System127 dB1 dB700 MHz3000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-68550 OhmsDual 4 x 1 LC Handover System127 dB1 dB700 MHz3000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-68850 Ohms8 x 8 LC Handover95 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232SMA Female
50PA-70150 Ohms4 x 1 LC Handover System95 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-71650 Ohms8 x 2 LC Handover System95 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-71750 Ohms16 x 2 LC Handover System95 dB1 dB2000 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-78350 Ohms6 x 2 LC Handover System127 dB1 dB700 MHz3000 MHzManual, Ethernet, RS-232N Female
50PA-79250 OhmsDual 8 x 1 LC Handover System127 dB1 dB700 MHz3000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-79950 Ohms6 x 1 LC Handover System127 dB1 dB700 MHz3000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-81150 Ohms8 x 2 LC Handover System95 dB1 dB30 MHz3000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-89950 Ohms12 x 1 LC Handover System127 dB1 dB698 MHz3000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-94150 OhmsDual 8 x 1 LC Handover System95 dB1 dB700 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-95150 Ohms16 x 3 LC Handover System95 dB1 dB500 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-96250 OhmsQuad 8 x 1 LC Handover System95 dB1 dB700 MHz6000 MHzManual, Ethernet, RS-232SMA Female
50PA-96450 Ohms(8) 2 x 1 LC Handover System95 dB1 dB700 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-97850 Ohms8 x 1 LC Handover System95 dB1 dB700 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female
50PA-98850 Ohms8 x 2 LC Handover System95 dB1 dB500 MHz6000 MHzManual, Ethernet, RS-232N, SMA Female

LC Handover Test System Example

The below block diagrams show examples of a 4 X 2 limited fan-out configuration (LC) handover test system. Each input port has its own individually controlled programmable attenuator. The input signals are summed together by the 1X4 divider/combiner and then split to both output ports by the 1X2 divider/combiner. An input signal is simultaneously available to both output port at the same attenuated level.

The isolation between the two output ports is determined by the isolation of the 1X2 divider/combiner. Reactive power divider/combiners typically have 20dB of port to port isolation. The isolation between input ports is determined by the isolation of the 1X4 divider/combiner. Keep programmable attenuators on unused paths at their maximum attenuation setting in order to maximize input to input isolation.

Block Diagram #1
This block diagram illustrates the construction of the 4 X 2 limited fan-out configuration (LC) handover test system. It shows all of the connectivity between the input ports and the output ports. This design allows the RF signal on input #1 to be simultaneously available to both outputs at the same attenuation level.

Block Diagram #2
This block diagram shows one possible setting of the 4 X 2 limited fan-out configuration (LC) handover test system. There are four input signals (red, blue, green, purple). The 1X4 divider/combiner sums up all of the input signals. The 1X2 divider/combiner splits the signals up to both output ports.

Attenuators #1 and #2 attenuate their input signals at 0dB. Attenuators #3 and #4 attenuate their input signals at 0dB. The output signal for output #1 is identical to the output signal on output #2.

Block Diagram #3
This block diagram shows another possible setting of the 4 X 2 limited fan-out configuration (LC) handover test system. There are four input signals (red, blue, green, purple). The 1X4 divider/combiner sums up all of the input signals. The 1X2 divider/combiner splits the signals up to both output ports.

Each programmable attenuator is set to a different attenuation level (0db, 3dB, 6dB, 9dB). The output signal for output #1 is identical to the output signal on output #2.

Capabilities & Options

Custom Models
The models listed in the above table showcase some of our standard limited fan-out handover test systems. However, most of JFW’s test system business involves custom designed models. JFW does not charge NRE’s for custom models. We encourage you to email us your specific requirement at sales@jfwindustries.com. We will respond with a ROM (rough order of magnitude) quote in 1-2 days. Please include a block diagram with your request if the test system involves multiple RF components.

Remote Commands
JFW has standard remote commands for GPIB, Ethernet, and RS-232 controlled models. The command syntax is simple and allows easy control of the RF switch settings. In addition to our standard commands, JFW can also provide customer specific commands upon request.

Test Software
JFW provides a GUI test program with all Ethernet and RS-232 controlled test systems. The test software for handover test systems has all of the remote commands built in for easy testing. Jump to our sample test programs to see example programs.

Options
Attenuators: Electro-mechanical (up to 18GHz)
Remote Control: Ethernet, RS-232, GPIB, or TTL
Manual Control: Keypad with display
Enclosures: Benchtop or 19″, 23″, 24″ rack enclosures
Supplied Power: AC, Dual redundant AC, or DC powered
RF Connectors: BNC, TNC, SMA, N, etc.
Impedance: 50 Ohm or 75 Ohm

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