PTG-10 Pilot Tone Generator 测试单音（导频音）发生器

特点：

• Allow Use of Low Cost Receiver in Voting System.
  允许在比选系统中使用低成本接收机
• Permits Audio and COR to Occupy Same Pair of Wired.
  允许话音和COR占用同一对线路
• Produces Two Standard Pilot Tones: 1950Hz or 2175Hz.
  产生两个测试单音：1950Hz或2175Hz
• Insures the Integrity of Voting Receiver Site.
  确保比选接收机链路的完整性
• Allows Voter to Ignore Faulty Receiver Site.
  允许比选器忽视错误的接收机信道
• Provides Screwdriver Type Terminal Block.
  提供螺丝起子（类型）接线板
• Operates from +11 to +15 VDC.
  在+11至+15VDC下操作
• Balanced Audio Output for Long Distance Link.
  为长途链路提供平衡的话音输出
• Provides Two LEDs: Power and COR.
  提供两个LED指示：电源和COR
• Accepts Positive or Negative COR.
  接收正负COR

　　In an LMR voting system, receivers are strategically placed around a geographic area (at voting sites) to fill in dead spots where portable radios can not normally be head by other portabled, by the repeater, or by the dispatcher. The audio from each receiver is linked to the viter which continuously compares the signal　from all receivers

英文资料和技术参数

（文件为pdf格式）

　　while passing through the best quality signal to the dispacher, or by any other portable through the local repeater. In this system, it is necessary to transfer a receiver's COR or COS (Carrier Operated Relay or Carrier Operated Squelch) signal from a remote receiver site. COR is an indication that the receiver has broken squelch.
　　在一套LMR比选系统中，接收机被战略性地放置在一个地理区域内（在比选位置中），该区域通常为无法接收到其他移动电台、中继器或发信机的盲区。来自各个接收机的话音被连接到比选器上，它持续比较来自所有接收机的信号，并将最佳质量的信号传送给发报机，或通过本地中继器转发给其他移动电台。在该系统中，就需要从一个远端发射机位置传输一个接收机的COR或COS（载波操作中继或载波操作静噪）信号。COR是一个说明接收机是否已中断静噪的指示信号。

　　The PTG-10 Pilot Tone Generator Module produces a controlled pilot tone as a means of transferring a COR signal from a remote receiver site to a local site containing a voter or repeater. Use of the PTG-10 transfers the COR signal over the same path as the receiver audio, eliminating the need for a second communications path for the COR signal. Audio output（an AC signal）exits a receiver through one pair of wires and COR(a DC signal) exits the receiver on another wire making it impossible to carry both the audio and the COR on the same audio pair. The PTG-10 converts the COR signal to a tone which is mixed with the audio from the receiver, removing the need for a COR line. The PTG-10 works by injecting a pilot tone on the audio line whenever the associated receiver is squelched, and removes the tone whenever the receiver is unsquelched. When the receiver used in the voting application detects carrier(receives a signal), it unsquelches and issues a COR signal to the PTG-10. When the PTG-10 receives a COR signal the tone is removed from the audio link and the receiver audio is passed through the link to the voter.
　　PTG-10测试单音发生器模块产生一个可控的测试单音作为从一个远端接收机位置向一个在本地的比选器或中继器传输的一种方法。使用PTG-10可在例如与接收话音同样的信道中传输COR信号，而无须为COR信号提供第二条通信信道。话音输出（一个AC信号）存在于一台接收机的一对电线上的，而COR（一个DC逻辑信号）则存在于该台接收机的另一条电线上，令其无法在同一对话音传输线中同时传输话音和COR信号。PTG-10可将COR信号转换为一个单音，令其混合于来自接收机的话音中，从而可以取消COR信号所需占用的那条线路。PTG-10通过在话音线路上插入一个测试单音的方式开始工作，只要所配合使用的接收机处在静噪状态，并在接收机为非静噪状态时，去掉该单音。当接收机用于比选应用中来探测载波（接收一个信号），它为非静噪状态，并发出一个COR信号到PTG-10上。当PTG-10接收到一个COR信号时，就从话音链路中去掉单音，接收机的话音将通过该链路连接到比选器上。

　　The pilot tone from the PTG-10 functions as a line proving tone to insure the integrity of the audio link in the following way: the removal of the pilot tone on the link notifies the voter to begin looking for voice signals from the voting receiver. If the voter doesn't sense voice coming from the receiver within a programmed time, it faults that particular voting site on the assumption that either the voting receiver is not functioning, or the link is broken between receiver and the voter. A voter such as JPS Communications' SNV-12 disallows use of that voting input until voice is received from the distant receiver or until the pilot tone returns.
　　来自PTG-10的导频音的功能是作为一个线路测试音来确保在以下应用中话音链路的完整性：在链路中去掉导频音，通知比选器在比选接收机中开始寻找话音信号。如果比选器在编程设定的时间里没有探测到来自接收机的话音，它就剔除去那台设备（也许是比选接收机无法工作或是比选器和接收机之间的链路中断）。例如一台JPS通讯公司的SNV-12比选器不允许使用经过比选的输入信号，直到从远端接收机发出的话音被接收到或直到导频音返回来。

　　The PTG-10 is capable of injecting one of two user selectible pilot tones: 1950Hz or 2175 Hz. A 2700Hz tone, normally used in Europe, may be optionally ordered. The module is 6.84"x2.42"x1.2" and is enclosed in a metal box suitable for mounting to any flat surface or to a standard 19'' rack. Audio input from the receiver is unbalaced, while audio output to the voter is configured for 600 Ohm balanced operation. The terminal block has provisions for a COR input(either positive or negative logic), power output (+11 to +15 VDC) and ground. Two LED's are provided: One indicates the state of the receiver's COR signal and one is a power indicator. The pilot tone level and the audio output level,voice plus pilot tone, are independently adjudtable.
　　PTG-10能够由客户二选一地插入一个测试单音：1950Hz或2175Hz。一个通常在欧洲使用的2700Hz单音，可作为选件订购。该模块大小为6.84"x2.42"x1.2"，并封装在一个金属盒内并可以安装于任何一个标准的19"机架的机箱中。来自接收机的话音输入是不平衡的，而对比选器的话音输出则被设定为600Ohm平衡的。终端模块提供一个COR输入（逻辑正或负），电源输出（+11至+15VDC）和接地。提供了两个LED：一个显示接收机的COR信号状态，另一个则为电源显示灯。测试单音电平和话音输出电平，话音加载测试单音均独立可调。