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6.7 IF Converter
The IF converter mixes the receiver output signals with the
first LO generated by a front end synthesizer. Two signals between
512 and 1024 MHz are output by each IF converter, one for each sense
of circular polarization. The same LO signal is used for mixing with
both polarizations in most cases. However, the 4 cm IF converter has
a special mode that allows both output signals to be connected to the
RCP output of the receiver and to use separate LO signals, thereby
allowing the use of spanned bandwidths exceeding 512 MHz. Also, the
90 cm and 50 cm signals are combined and transmitted on the same IFs.
The 50 cm signals are not frequency converted, while the 90 cm signals
are upconverted to 827 MHz before output.
Jon Romney
2012-01-05