Description
Model 75PA-125-XX is a 19 inch rack mount attenuator assembly containing electro-mechanical 75 Ohm step attenuators that operate DC-2150 MHz. The number of attenuators can be selected from 1 to 6 attenuators. The attenuators have an attenuation range of 0 to 63.5dB by 0.5dB steps. The attenuators can be controlled manually or remotely. It is available with F female 75 Ohm RF connectors. The RF connectors are located on the rear panel. We label the RF connectors as Input and Output, but the attenuators do operate bi-directionally. The Input/Output labeling is a naming convention only.
Example Model Numbers
75PA-125-01 F (1 attenuator with F female)
75PA-125-02 F (2 attenuators with F female)
75PA-125-03 F (3 attenuators with F female)
75PA-125-04 F (4 attenuators with F female)
75PA-125-05 F (4 attenuators with F female)
75PA-125-06 F (4 attenuators with F female)
Manual Attenuator Control
The manual control menu allows you to set/read an attenuator, fade an attenuator, or perform a handover using two attenuators.
Remote Attenuator Control
This attenuator assembly can be remotely controlled via an Ethernet connection or a serial connection (i.e. RS-232). The network settings can be changed manually with the keypad or remotely using the NET remote command. The network interface can be set to either DHCP mode or Fixed Address mode. All new test systems are shipped from the factory in DHCP mode. A RS-232 connection to the test system is made using a null modem type serial cable. Baud rates up to 155200 baud are available. The baud rate can be changed manually with the keypad or remotely with the SERIAL remote command.
Remote Command Set
The firmware manual for our latest generation firmware is available for download. This manual lists all of our remote commands with command syntax and examples. Our firmware uses simple ASCII formatted remote commands. If you are connected to a JFW test system and send the HELP command, it will respond back with a list of all remote commands for that specific test system.
