Abstract: A multi-mode radio transceiver comprising a sequence of bi-directional circuit modules including a radio frequency input/output amplifier module (1), a radio frequency/baseband I and Q quadrature channel conversion module (2), an analogue/digital conversion module (3), a digital signal processor (4,5), and a digital signal input/output interface (6), with a control means (7) whereby for transmission a radio frequency signal is formed from analogue quadrature I and Q channel components of a digitized signal at baseband and translated to the radio transmission frequency and for reception the radio frequency signals are transformed into I and Q quadrature analogue components at baseband and subsequently digitized.

Abstract: A simple radio receiver for FSK signals is described in which the signals from the aerial are mixed in two high-gain mixers respectively with local oscillator signals in phase quadrature and at the signals' nominal center frequency. The outputs from the mixers are low-pass filtered to get the difference frequencies. The filter outputs are amplified and one applied to the D input of a D-type flip-flop to the clock input of which the other is applied. The flip-flop output gives the FSK modulation. It is highly desirable that the local oscillator's outputs, called Io and Qo should be in accurate phase quadrature, and the circuit described herein is intended to achieve this. To do this, the Io and Qo signals are applied to a quadrature phase sensitive detector (10) which, if the phase relation is wrong, gives an error signal. This is applied to an adjustable phase shifter (12) in one of the oscillator outputs, in this case the Qo output. Alternatively, the phase adjustment can be applied to both Io and Qo lines.