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Receiver Multicoupler User's Manual
USB Control Mode
The RxMux can be operated via a USB communications link using the Command Line Interface (CLI). This CLI
allows the user to set Auto Gain mode, the gain, and to view the alarm status of the unit.
To use the USB interface, the USB drivers are available for downloading from the RFI website and need to be
installed on the PC. Connect the RxMux to a PC using a USB cable with a type A connector on one end and a type B
on the other. When the RxMux is first powered on you will be asked to install new USB drivers. Browse to the
directory where they were saved when downloaded. Follow the on-screen instructions to install the driver. Two
different drivers are provided and it may be necessary to install both drivers depending on your particular computer
configuration. If you have problems installing the drivers there are several helpful "Installation Guides" also available
for downloading from the RFI website.
Note:
The length of the USB cable between the computer and RxMux should be no longer than 5m for reliable
communications.
Auto Gain
Auto Gain is a feature that automatically restores the gain of the RxMux in the event of an internal amplifier fault. If a
fault occurs in one half of the quadrature amplifier the RxMux gain will decrease by approximately 6dB.
If the gain was initially set to at least 6 dB lower than the maximum gain available Auto Gain will restore the gain to
the initial set level.
If the gain was initially set to a level between the maximum gain and 6 dB less than the maximum gain then Auto
Gain will restore the gain to a level 6dB below the maximum gain.
Example:
Assume the RxMux has a maximum gain of 15 dB. If the gain is initially set to 7 dB and an amplifier fault occurs, Auto
Gain will automatically restore the gain to 7 dB. If the gain is initially set to 12 dB and a fault occurs then Auto Gain
will set the gain to 6 dB less than the maximum gain which, for this unit, is 9 dB.
Note:
Although the gain is restored, one half of the quadrature amplifier is not operating and therefore the Noise
Figure will be degraded by approximately 3 dB and the Input Return Loss and Third Order Intercept Point will be
degraded by up to 6 dB. This feature will not automatically compensate for all possible amplifier faults. This feature
is only available on units with firmware version 1.1 or greater. Units with firmware version 1.0 can be upgraded to
include this feature by installing the latest firmware. This applies to all models of RxMux.
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