SFC6400A/SFC1450A Synthesized Frequency Upconverter Introduction
TM106 – Rev. 1.1 1-3
The internal IF is converted by the Second Mixer LO to 70 or 140 MHz. The 70/140 MHz IF chain
also performs filtering and phase equalization via an all-pass network. The gain calibration process
also provides gain slope across all bands to be within the specified ± 0.75 dB. Additional gain
compensation due to changes in ambient temperature provide for high gain stability over various
operating conditions.
The SFC Upconverters have been designed to provide performance that meets or exceeds all
industry standards in effect today for satellite communications earth station frequency converter
equipment found worldwide. In addition to providing robust performance, the SFC Upconverters are
loaded with features that will provide ease of integration and operation.
1.1 Protection Switch Versatility
Radyne ComStream Corporation SFC family of Converter Products feature ‘plug-and-play’ ease of
installation with the RCU101 1:1 or the RCU108 1:8 Redundancy Control Units. All converters can
be plugged into the backup slot and assume the role of protection switch controller. The backup
converter learns and stores the frequency, gain and channel settings of the primary converters. The
backup converter can be operated automatically, in which case an automatic backup of a faulted,
online Converter occurs after a user-programmed delay. The Backup may also be operated
manually, allowing the user to manually switch in the Backup Unit. The Front Panel controls and
indicators provide for automatic/manual configuration, as well as display of online/offline status
information. In the event the stored settings of the Primary Converter are changed, the backup
converter will notify the user.
All circuits are protected upon installation of the switch and completion of the learning process.
This eliminates the need for complicated software configurations that might otherwise leave a circuit
vulnerable. Likewise, replacing a failed converter is as simple as plugging in a replacement.
1.2 Chain Switching (Optional)
Chain Switching is available as an option for the SFC6400A and SFC1450A Upconverters. This unit
can be delivered with the optional Chain Switching Module in place, or may be purchased
separately and installed by the customer (no tools are required). When equipped with this module,
in the event of a unit failure (in a 1:1 or 1:N Configuration where N is less than or equal to 8), the
Upconverters themselves perform the switching. This eliminates the need for a separate converter
protection switch such as the Radyne ComStream Corporation RCU101 or RCU108.
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