Patent ID: 8554164

Claim:
A receiving device of a dual polarization transmission system that uses a reference synchronous scheme, the device comprising: a receiver that receives an RF signal that is transmitted with the use of two orthogonal polarizations; two reception local oscillators that include PLL circuits to convert the received RF signal of each of the polarizations into an IF signal; and a demodulator that demodulates an IF signal of one polarization, which is obtained by the conversion, into a baseband signal, wherein the reception local oscillators control a loop band of the PLL circuits in accordance with a transmission capacity in response to a signal from the demodulator, and wherein the reception local oscillators make, in response to a signal from the demodulator, the loop band of the PLL circuits of the reception local oscillators narrower than a first integration range of the demodulator at a time when the transmission capacity is a first transmission capacity, and the reception local oscillators control, at a time when the transmission capacity is a second transmission capacity that is larger than the first transmission capacity, so that the loop band of the PLL circuits of the reception local oscillators becomes widened to the extent that a second integration range of the demodulator is not affected.