CR 300 is a summary designation for a receiver system the
basic design of which allows for a large number of special
requirements to meet by means of a number of additional
plug-in subunits .
The control system of the receiver has been designed so as
to allow for use in very modern communication systems as for
instance radio exchange systems and automatic channel
scanning, etc. All subunits can be exchanged without the
need of alignment, which makes maintenance simpler and
cheeper.The frequency processing plan with a high (139.3
MHz) fixed first intermediate frequency makes it possible to
exchange the HF-stages of the receiver to a parametric
up-converter with crystal filter for the first intermediate
frequency should this technique in the future prove
advantages technically and economically. The receiver
described below, CR 301, can be completed for reception of
I.S.B. by adding two subunits. Only about 15 minutes will be
needed for this operation.
The local oscillator outlets from the synthesizer are
doubled and can together with the control signals of the
receiver, be made available on the rear panel of the
receiver. In this way two receivers, one without a
synthesizer, can be operated in diversity.