公开(公告)号：US3766523A

公开(公告)日：1973-10-16

申请号：US3766523D

申请日：1972-10-04

Applicant: MOTOROLA INC

Inventor： BROCKER J ,  CHAPMAN R ,  POWELL J ,  PEAY R ,  JACOBS P ,  JOHNSON R

IPC: G08G1/123 ,  H04L1/00 ,  H04W84/02 ,  H04B1/00 ,  H04Q1/45

CPC classification number: H04W84/025 ,  G08G1/202 ,  H04L1/00

Abstract: A selective calling sequential tone signalling system for transmitting and receiving predetermined coded messages. A base station and at least one mobile station is provided, and message, status, automatic status and identification codes comprising predetermined format sequences having seven tones each are transmitted therebetween. Automatic message acknowledgment is provided for message receipt verification, and apparatus is provided for substantially eliminating false reception of signals having an improper format.

Abstract translation: 一种用于发送和接收预定编码消息的选择性呼叫顺序音调信令系统。 提供基站和至少一个移动站，并且在它们之间传输包括具有七个音调的预定格式序列的消息，状态，自动状态和识别码。 为消息接收验证提供了自动消息确认，并且提供了用于基本上消除具有不正确格式的信号的错误接收的装置。

公开(公告)号：US3721932A

公开(公告)日：1973-03-20

申请号：US3721932D

申请日：1971-09-14

Applicant: MOTOROLA INC

Inventor： FIERSTIEN G ,  JACOBS P

IPC: H01F30/10 ,  H01F27/30

CPC classification number: H01F30/10

Abstract: A broadband radio frequency transformer for use in the frequency range from 25 to 175 megahertz includes closely coupled windings on a ferrite rod providing low leakage inductance. A plurality of primary coils and a single continuous secondary coil are provided, with each primary coil bifilar wound with a portion of the secondary coil. The number of turns in the secondary coil is equal to the total number of turns in all the primary coils, or may be up to 50% greater than the total number of turns in the primary coils. The primary coils are connected in parallel to provide a step-up transformer having an impedance ratio related to the ratio of the number of turns in each primary coil to the number of turns in the secondary coil. The single coil can be used as the primary winding and the plurality of coils connected in parallel as the secondary winding for an impedance step-down transformer.

Abstract translation: 在25至175兆赫兹的频率范围内使用的宽带射频变压器包括提供低漏电感的铁氧体棒上紧密耦合的绕组。 提供多个初级线圈和单个连续次级线圈，其中每个初级线圈双相缠绕有次级线圈的一部分。 次级线圈中的匝数等于所有初级线圈中的总匝数，或者可以比初级线圈中的总匝数高达50％。 初级线圈并联连接以提供具有与每个初级线圈中的匝数与次级线圈中的匝数之比相关的阻抗比的升压变压器。 单线圈可以用作初级绕组，并且多个线圈并联连接作为用于阻抗降压变压器的次级绕组。