Order this information in Print

Order this information on CD-ROM

Download in PDF Format


Click here to make tpub.com your Home Page

Back | Up | Next

Click here for a printable version




Information Categories
.... Administration
Food and Cooking
Nuclear Fundamentals
  Educational CD-ROM's
Printed Manuals
Downloadable Books


TM   11-5821-333-12 1-17. FREQUENCY HOPPING OPERATION.  Continued late entry mode is selected, the search procedure is changed to permit a +59 second difference. A late entry RT must receive the late entry sync data to synchronize with the net. Late entry sync data is included with the regular synchronizing signal at a maximum of once every 30 seconds for the net. The RT also checks the cue frequency during passive receive for any activity. When an RF signal with a 150 Hz squelch tone on the RF cue frequency is detected,  the  RT  displays  “CUE”  and  the  headset  beeps. The NCS uses the frequency hopping-master (FH-M) mode. It differs from FH in two ways, The NCS is the time standard for the net, and the NCS RT is the only one that can transmit ERF data. When an RT receives a message, it automatically adjusts its clock toward the transmitting RT clock. This adjustment can be a maximum of one-half second for each received message. The NCS RT does not adjust its clock with a received message. When the NCS is an active net member, all of the net member’s RT clocks will be synchronized with the NCS RT clock, All the required FH data, except the TRANSEC key (Non-lCOM) may be sent from the NCS to net members using ERF. The NCS loads its holding memory with the fill data to be transmitted, The fill data can be either a hopset or a lockout  set.  When  the  ERF  or  SEnd  button  is  pressed,  the  RT  is  keyed  and  the  fill  data transmitted. The fill data is preceded by a synchronizing signal and the NCS FH sync time. An end-of-message code is sent twice after the fill data. The receiving RT detects the codes in the message that identify it as fill data and places the fill data in the holding memory. A typical net opening will use the cold start procedure, Operation in the cold start mode is the same as normal FH operation except that the RT hops on a single frequency, The frequency  used  is  the  one  in  the  SC  MAN  preset. When the RT is operating with the data or COMSEC equipment, the analog-to-digital and digital-to-analog conver- ters are bypassed. When necessary, data is converted to 16 kb/s by the DRA. The DRA also adds a code to the message  to  identify  it  as  data. When the radio set FUNCTION switch is set to OFF, the RT clock is kept running for 24 hours. After 24 hours, the clock is turned off to preserve the holding battery life. All fill data is retained. The life of the holding battery can be extended  by  supplying  DC  power  to  the  RT  when  the  RT  is  turned  off. 1-18.   VOICE   OPERATION   WITH   KY-58   COMSEC   EQUIPMENT. ARRANGEMENT FOR VOICE OPERATION WITH KY-58 COMSEC EQUIPMENT a.  Introduction.  The  RT  can  be  used  with  the  VINSON  COMSEC  KY-58,  The  KY-58  provides  security  for voice and data communications. It encrypts signals from the intercom and decrypts encoded signals received by the  RT.  The  optional  Z-AHQ  interface  adapter  is  used  to  adapt  the  KY-58  to  some  aircraft,  The  Z-AHP  remote control unit is also a KY-58 option. When the Z-AHQ is not used, the RT and intercom are connected directly to the  KY-58,  and  the  Z-AHP  connects  to  the  RT  and  the  KY-58.  Use  of  the  KY-58  with  data  equipment  is discussed  in  paragraph  1-20.  Plain-text  voice  and  cipher-text  voice  are  discussed  here. 1-13

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business