| 摘要 |
<p>PURPOSE:To shorten catching time. CONSTITUTION:Control voltages are respectively supplied from a loop filter 3 to a voltage controlled oscillator VCO (R) 4 and VCO (T) 7 which output frequency characteristic is inverted to the control voltages. When there is no Doppler shift in received signals, a received frequency and the control voltage is turned to a central value, a transmitted frequency from the VCO (T) 7 is transmitted at the central value, an opposite side communicating station is set on standby for reception at the central value, and the frequency can be immediately caught. When there is the Doppler shift in a receiving frequency [fr], signals are transmitted at a transmitting frequency [ft] depending on the [V1] of the control voltage, the opposite side communicating station receives the frequency signal of the central value on standby for reception receiving the Doppler shift to the transmitting frequency [ft], and the signal can be immediately caught.</p> |
