公开(公告)号：US5530436A

公开(公告)日：1996-06-25

申请号：US260636

申请日：1994-06-16

申请人： Itzhak Tabib ,  Uzi Zakai ,  Haim Geller

发明人： Itzhak Tabib ,  Uzi Zakai ,  Haim Geller

IPC分类号： G06F13/38 ,  H04L29/06 ,  H04J3/24

CPC分类号： G06F13/387 ,  H04L29/06

摘要： A method of communications between a master unit and a slave unit of a supervisory control and data acquisition system is provided. The communications protocol has at least two bytes of data where the first byte (100) is an address byte containing address information for addressing the slave unit and the second byte (101) is a control byte containing an expansion bit and two address/type variable bits to be interpreted by the slave according to a rule set. In the rule set, the meaning of certain control bits (107) is related to the state of an expansion bit (103). The expanion bit defines the presence or absence of a third byte (102).

摘要翻译： 提供了一种监控和数据采集系统的主单元和从单元之间的通信方法。 通信协议具有至少两个字节的数据，其中第一字节（100）是包含用于寻址从单元的地址信息的地址字节，第二字节（101）是包含扩展位和两个地址/类型变量的控制字节 从机根据规则集解释的位。 在规则集中，某些控制位（107）的含义与扩展位（103）的状态有关。 扩展位定义第三个字节的存在或不存在（102）。

公开(公告)号：US5722046A

公开(公告)日：1998-02-24

申请号：US489645

申请日：1995-06-12

申请人： Salomon Serfaty ,  Uzi Zakai ,  Efraim Rushinek ,  Shimon Dick

发明人： Salomon Serfaty ,  Uzi Zakai ,  Efraim Rushinek ,  Shimon Dick

IPC分类号： H04B1/16 ,  H04W52/02 ,  H04W88/02 ,  H04B7/26

CPC分类号： H04W52/0238 ,  H04W88/022 ,  Y02B60/50

摘要： A method is described of operating a radio system having a transmitter unit (10) and a receiver unit (11). At the transmitter unit, at least a potion (50) of an address is transmitted repeatedly for a predetermined period of time (T.sub.w), followed by a message. The receiver unit switches from a dormant, low power mode to a receive mode after a period of time in the dormant mode not exceeding the predetermined period of time (T.sub.w). In the receive mode address information is received and compared bit by bit with a predetermined address stored at the receiver unit. The receiver revels to the dormant mode as soon as a negative comparison is made, to a predetermined degree of non-correlation, between address information received and the predetermined address, thereby saving battery power.

摘要翻译： 描述了一种操作具有发射机单元（10）和接收机单元（11）的无线电系统的方法。 在发射机单元，地址的至少一部分（50）被重复发射一段预定的时间（Tw），随后是消息。 接收器单元在休眠模式的一段时间之后不超过预定时间段（Tw），从休眠，低功率模式切换到接收模式。 在接收模式中，地址信息被接收和比较与存储在接收器单元处的预定地址进行比较。 一旦接收到的地址信息与预定地址之间进行负比较，达到预定的非相关程度，则接收器进入休眠模式，从而节省电池电量。

公开(公告)号：US5710568A

公开(公告)日：1998-01-20

申请号：US488713

申请日：1995-06-08

申请人： Gadi Shirazi ,  Uzi Zakai ,  Shimon Medalsy

发明人： Gadi Shirazi ,  Uzi Zakai ,  Shimon Medalsy

IPC分类号： H01Q1/04 ,  H01Q9/14 ,  H01Q9/42

CPC分类号： H01Q9/42 ,  H01Q1/04 ,  H01Q9/14

摘要： An antenna is described having a generally elongate radiating part (10) and a reflective plane (11)juxtaposed and generally parallel to the elongate radiating part. The radiating part has a free end (15), a ground connection (13) remote from the free end and a feed connection (16) between the free end and the ground connection. The ground connection is mounted on the reflective plane (11), giving electrical ground connection and mechanical support. A method of manufacture of an antenna is also described involving breaking off an extension portion to suit the required frequency of operation.

摘要翻译： 描述了一种天线，其具有大体上细长的辐射部分（10）和并置并大致平行于细长辐射部分的反射平面（11）。 辐射部分具有自由端（15），远离自由端的接地连接（13）和自由端与接地连接之间的馈电连接（16）。 接地连接安装在反射平面（11）上，提供电接地连接和机械支撑。 还描述了一种制造天线的方法，其涉及断开延伸部分以适应所需的操作频率。

公开(公告)号：US5339333A

公开(公告)日：1994-08-16

申请号：US010955

申请日：1993-01-29

申请人： Ilan Zehngut ,  Uzi Zakai

发明人： Ilan Zehngut ,  Uzi Zakai

IPC分类号： H04L27/156 ,  H03D3/00 ,  H04L27/14

CPC分类号： H04L27/1566

摘要： An FSK demodulator is provided comprising means for receiving and digitizing an FSK signal (such as a signal comprising two frequencies f1 and f2 in which first and second logic states are represented by first and second periods of different durations). First, second, third and fourth consecutive transitions of the signal are identified and the times of said transitions are identified. A first period between the first and third transitions is calculated, as is a second period between the second and fourth transitions. A change of frequency in the signal is indicated when the first and second periods lie on opposite sides of a first threshold period (.tau.) and no change of frequency is indicated when the first and second periods lie on the same side of the threshold period (.tau.). In a further aspect of the invention, a transition is rejected as illegal when two consecutive transitions occur within a predetermined period of time.

摘要翻译： 提供FSK解调器，其包括用于接收和数字化FSK信号（诸如包括两个频率f1和f2的信号的装置，其中第一和第二逻辑状态由不同持续时间的第一和第二周期表示）。 识别信号的第一，第二，第三和第四连续转换，并且识别所述转换的时间。 计算第一和第三转换之间的第一周期，以及第二和第四转换之间的第二周期。 当第一和第二周期位于第一阈值周期（τ）的相反侧时，指示信号中的频率变化，并且当第一和第二周期位于阈值周期的同一侧时，不指示频率变化（ tau）。 在本发明的另一方面，当在预定时间段内发生两个连续的转变时，转移被拒绝为非法。