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This paper describes the design and performance of a compact and low cost RF-Head for Inmarsat-M applications. The RF-Head is part of a portable satellite communication terminal called "BIPSAPHONE". BIPSAPHONE supplies phone and fax services to the customer.The RF-Head includes a receiving and transmitting channels, receiving and transmitting synthesizers, RFController and a DC supply unit. The RF-Head size is 3Ox20X2.5 cm and weight less than 1Kg.The transmitting channel may be operated in high power mode or in low power mode to transmit 1OW Or 4W respectively. The output power level is automatically controlled by the RF controller.The noise figure of the receiving channel is better than 2.2 dB including 1 dB diplexer losses.The total gain of the receiving channel is 75dB.