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    Mixer for controlling the frequency accuracy of a variable frequency oscillator
    81.
    发明授权
    Mixer for controlling the frequency accuracy of a variable frequency oscillator 失效
    用于控制可变频率振荡器的频率精度的混频器

    公开(公告)号：US3857099A

    公开(公告)日：1974-12-24

    申请号：US35842373

    申请日：1973-05-08

    Applicant: US ARMY

    Inventor： LOHRMANN D

    IPC: H03B21/01 ,  H04B1/26

    CPC classification number: H03B21/01

    Abstract: A mixer for a frequency synthesizer system that controls the frequency accuracy of a variable frequency oscillator of a radio transmitter and which includes a balanced amplifier that is nonconductive except when switched on by each of identical periodic impulses shaped to include a predetermined number of successive harmonics from the fundamental on, all having approximately equal amplitude, and a selected frequency input from the variable frequency oscillator to the balanced amplifier so that the mixer output includes a predetermined narrow frequency band that is less than said fundamental.

    Tone generator for selective call transmitter
    82.
    发明授权
    Tone generator for selective call transmitter 失效
    用于选择性呼叫发射机的音调发生器

    公开(公告)号：US3828272A

    公开(公告)日：1974-08-06

    申请号：US30685972

    申请日：1972-11-15

    Applicant: WYCOFF K

    Inventor： WYCOFF K

    IPC: H03B21/01 ,  H03B21/00

    CPC classification number: H03B21/01

    Abstract: The tone generator includes a first oscillator to generate a first signal of a fixed frequency and a second oscillator which is variable to generate a second signal of a selected frequency. A multiplier receives the signals and provides a pair of tones having frequencies respectively equal to the sum of and difference between their frequencies. A switch may be provided so that both inputs to the multiplier are received from the variable frequency oscillator, in which case the output of the multiplier will be a single tone having a frequency twice that of the signal produced by the variable frequency oscillator. In either event, the tones are modulated on an RF wave.

    Abstract translation: 音调发生器包括：第一振荡器，用于产生固定频率的第一信号;以及第二振荡器，该第二振荡器可变以产生选定频率的第二信号。 乘法器接收信号并提供一对频率，其频率分别等于它们的频率之和和之差。 可以提供开关，使得从可变频率振荡器接收到乘法器的两个输入，在这种情况下，乘法器的输出将是具有由可变频率振荡器产生的信号的频率的两倍的单个音调。 在任一情况下，在RF波上调制音调。

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