| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain sufficient isolation even when electric power is not applied. <P>SOLUTION: A two-way AMP 1 includes a squelch circuit 16 at an up-line portion between a second branch circuit 14 and a first branch circuit 11. The squelch circuit 16 includes a PIN diode, attenuating an up-signal in the absence of applied electric power, the PIN diode being inserted in series between an input and an output. Consequently, a changeover SW 19 is switched to an amplification mode side to obtain sufficient isolation even when no electric power is applied to the two-way AMP 1. <P>COPYRIGHT: (C)2011,JPO&INPIT |
