  DIGITAL SIGNALLING FEATURES


  The Digital Signalling Screen allows you to modify the options for digital
  signalling.  Use the Up/Down Arrow Keys to Enable/Disable.  Use the Numeric
  Keys to enter numbers or the Up/Down Arrow Keys to scroll through the
  values.

  SIGNALLING TYPE - This feature selects the signalling scheme to be used in
  the transmission of the Unit ID and Emergency packets.  The Signalling Type
  may be set to one of the following:  MDC600, MDC1200, STAR400E, STAR400P,
  STAR800E, STAR800P, and NONE (where P = Portable and E = Extended).
  This feature determines the range of the UNIT ID as follows:
  For MDC (600 or 1200): 0001 - DEEE (Hex - Except F's).
  For STAR400P or STAR800P: 0001 - 8191 (Decimal).              <Page Down> 
.P
  For STAR400E or STAR800E, the Unit ID Range is 0001 - 9999 (Decimal).
  The number (400 or 800) for the STAR signalling scheme indicates the
  baud rate.  The Unit ID and Emergency decoders will determine whether
  the Portable or Extended mode is being used.  Selecting NONE, Disables
  this feature.

  UNIT ID NUMBER - Each radio within a system will have a unique 4 digit
  number associated with it referred to as the Unit ID, and is used to
  identify the portable at the base station.  This number is transmitted
  upon a change in state of the PTT.  The Unit ID Number range depends on
  the Signalling Type being used as follows:
  For MDC (600 or 1200):  0001 to DEEE (hexadecimal - excluding "F's"),
  For STAR (400 or 800) Portable:  0001 - 4095 (decimal) or with a special
  special decoder, 0001 - 8191 (decimal); Extended: 0001 - 9999 (decimal).
                                                  <Page Down>    <Page Up> 
.P
  PRETIME - The Pretime is the amount of time the clear carrier is sent
  out before the data packet is sent out.  This feature is enabled on all
  radios, and a pretime length must be selected.  The Pretime length should
  be greater than the access time of the system in which the radio will be
  used. The choices range from 100 ms to 2500 ms in 10 ms increments.
  Pretimes which are generally considered standard are 300ms, 500ms, and
  750ms.

  Tx UNIT ID - This status of this feature determines the time at which the
  Unit ID will be transmitted.  If set to KEYUP, the Unit ID is transmitted
  when the PTT is initially pressed.  If set to DEKEY, the Unit ID is trans-
  mitted upon release of the PTT.


                                                  <Page Down>    <Page Up> 
.P
  UNIT ID SIDETONES - This option Enables/Disables the sidetones during Unit
  ID.  If Enabled, a 1640 Hz sidetone will be emitted during the Pretime and
  Data transmission to remind the user that data is being transmitted, and
  should not talk during this time.

  DATA OPERATED SQUELCH (DOS) - This option Enables/Disables DOS per radio.
  If Enabled, DOS will detect an incoming packet, of the same signalling
  scheme as that in the radio, and squelch the audio for the duration of the
  packet.  A small 'blip' of data will be heard, but most of the packet will
  not be heard.

  EMERGENCY - This option Enables/Disables Emergency on a per radio basis.
  This option must be enabled for any emergency features to function.  When
  enabled, this feature will transmit a series of emergency packets whenever
                                                  <Page Down>    <Page Up> 
.P
  the emergency switch is pressed.  Other features affect how these packets
  are transmitted and how the radio acts during emergency sequences, such as:
  sidetones during the emergency packets, silent emergency, control of
  transmit light, polite or impolite transmit priority of emergency packets,
  selectable number of polite and impolite transmissions (a polite
  transmission will sense the channel for activity and transmit when the
  channel is clear, and an impolite transmission will 'blast' the channel
  without checking for activity), and emergency channel revert.

  NOTE: EMERGENCY can only be enabled if Tx INHIBIT on Busy Channel
  (Per-channel feature) is set to disable on all channels.


                                                  <Page Down>    <Page Up> 
.P

  EMERGENCY SIDETONES - This option Enables/Disables Emergency Sidetones.  If
  enabled, a 1640Hz tone will be emitted during the pretime and packet time
  of each emergency transmission.  This option can not be enabled if SILENT
  EMERGENCY is enabled.

  SILENT EMERGENCY - This option Enables/Disables Silent Emergency.  If
  enabled this option allows the total anonymity of the Emergency user by
  muting the receive audio for the entire data transmission sequence.  This
  will ensure that the audio remains muted for the base's Emergency
  acknowledge packet or any other modulated transmissions during the
  interpacket delay.  This option may not be selected simultaneously with
  Emergency Sidetones.  The radio remains in this mode (no receive audio)
  until it has been cancelled by PTT.
                                                  <Page Down>    <Page Up> 
.P
  LIVE MIC

  If enabled this option causes the radio to remain in Tx mode (with the
  mic enabled) for a programmable time period after the last emergency
  packet has been sent.

  LIVE MIC TIME -  Live mic time is programmable from 1 to 300 seconds in
  1 second increments.





                                                  <Page Down>    <Page Up> 
.P
  EMERGENCY TRANSMIT LIGHT - This option Enables/Disables the Emergency
  Transmit Light.  If enabled, the transmit light will light during each
  emergency packet transmission.  This option will give visual feedback that
  the emergency is being transmitted.  If disabled, the transmit light will
  not light during the emergency sequence.

  TRANSMIT LIGHT RE-ENABLE ON REVERT - This option Enables/Disables the
  Transmit Light Re-enable On the Emergency Revert Channel.  The normal state
  of the transmit light on the revert channel is off.  This option is enabled
  if the user wants the transmit light to function normally while using the
  revert channel.  This feature does not affect the transmit light during the
  emergency sequence, only on subsequent transmissions after the emergency
  sequence is complete.
                                                  <Page Down>    <Page Up> 
.P
  EMERGENCY PRIORITY - This feature has two choices:  POLITE and IMPOLITE.  A
  polite transmission will sense the channel for activity and transmit when
  the channel is clear, and an impolite transmission will 'blast' the channel
  without checking for activity.  This feature enables the user to choose
  which transmission occurs first.  A standard system will transmit 15
  impolite transmissions followed by 5 polite transmissions.  This feature,
  along with the NUMBER OF POLITES and NUMBER OF IMPOLITES, allows the user
  much flexibility in configuring the emergency sequence.  Whichever
  selection is made, polite or impolite priority, that selection can not have
  a zero for number of transmissions.  The one that is not priority, however,
  may be set to zero.
                                                  <Page Down>    <Page Up> 
.P

  NUMBER OF IMPOLITES - This feature allows the user to enter the number of
  impolite emergency transmissions.  This number can be 01-99 if IMPOLITE
  EMERGENCY PRIORITY is selected and 00-99 if POLITE EMERGENCY PRIORITY is
  selected.

  NUMBER OF POLITES - This feature allows the user to enter the number of
  polite emergency transmissions.  This number can be 01-99 if POLITE
  EMERGENCY PRIORITY is selected and 00-99 if IMPOLITE EMERGENCY PRIORITY is
  selected.                                       <Page Down>    <Page Up> 
.P
  EMERGENCY CHANNEL REVERT - This option Enables/Disables the Emergency
  Channel Revert feature.  If enabled, all emergency transmissions will be
  made on the Emergency Revert Channel determined by the channel number
  entered in the REVERT CHANNEL # option.  Once the emergency is initiated,
  all subsequent transmissions of any kind, emergency or regular PTT, will be
  on the revert channel.  Channel changes are inhibited, and for rotary
  version radios, the selector switch may not correspond to the channel that
  is in use.  Display version radios will display the correct channel but
  will not allow channel changes.  The only way to get off of the revert
  channel is to turn the radio off and on.  This takes the radio out of the
  revert mode, and the radio will function as normal.


                                                  <Page Down>    <Page Up> 
.P
  EMERGENCY REVERT CHANNEL # - This option is used to select the channel for
  emergency revert.  EMERG REVERT must be enabled for this option to be
  displayed.  The channel chosen must have a valid transmit frequency
  associated with it in the radio workspace.

  EMERGENCY CHANNEL REVERT WARNING TONE - This option Enables/Disables the
  Emergency Channel Revert Warning Tone.  This is a 410 Hz tone heard on PTT
  transmissions on the revert channel.  This tone is used to remind the user
  that the radio is in the revert mode,  the channel selector switch on the
  radio may be incorrect and that channel changes will not be accepted.


                                                  <Page Down>    <Page Up> 
.P
  MAN DOWN - This option Enables/Disables the capability to initiate the
 transmitting of an emergency alarm sequence (including the ID code) when
 the radio is tipped more than 60 degrees from its vertical axis. Emergency
 must be enabled for this feature to work.
 Note: THIS FEATURE REQUIRES A SPECIAL FRONT COVER!

 MAN DOWN WARNING TONE - This option Enables/Disables a two second audible
 tone prior to the initiation of the emergency sequence. This tone is used
 to remind the user that two seconds remain prior to the initiation of the
 emergency sequence.

 MAN DOWN DELAY TIME - This feature sets the total time from when the radio
 is tipped greater than 60 degrees until the emergency sequence begins. Note
 that the time after the alert tone until the emergency sequence begins is a
 constant two seconds.                                           <Page Up> 
