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NAME
     xmit - Radio Free Ethernet transmitter

SYNOPSIS
     xmit [ -h host
     ] [ -s service ] [
     generic-tool-arguments ]

DISCLAIMER
     This program is furnished on an AS IS basis as a  demonstra-
     tion of audio applications programming.

DESCRIPTION
     xmit is the window-based Radio Free Ethernet transmitter. It
     functions as a graphical front-end to the radio_xmit(6) pro-
     gram, which it uses to read audio data from the audio device
     (or a file) and broadcast it over the network. (For an over-
     view of Radio Free Ethernet, please refer  to  the  radio(6)
     manual page.)

     Before you can start broadcasting, you must configure a sta-
     tion  name. Clicking on the Station item brings up a station
     edit panel that allows you to specify the station  name  and
     broadcast characteristics for one or more stations. The Sta-
     tion item brings up a menu of the stations that are  config-
     ured.  Once you select a station, you may begin broadcasting
     by pressing the Power button.

     Ordinarily, the  program  broadcasts  to  the  IP  Multicast
     address  identified by the host name RadioFreeEthernet found
     in the NIS hosts map. The -h host command-line option may be
     used to specify an alternate host address or name to use for
     the default IP Multicast address.

     The Radio Free Ethernet tools use the port number identified
     by the service name radio found in the NIS services map. The
     -s service command-line option may be  used  to  specify  an
     alternate service name or port number to use.

     The following sections describe the  individual  panel  con-
     trols.  In addition, online help is available by positioning
     the pointer over the item in question and pressing the  HELP
     key.

     Power toggles the state of the transmitter on and off. Since
           this involves communicating with a running copy of the
           radio_xmit program, this  operation  may  take  a  few
           seconds  to complete. This button is only enabled when
           a station name has been configured and selected.

     Station
           brings up a menu of the radio stations that have  been
           configured  for broadcast. The Edit... entry brings up
           a panel that may be used to add or modify  the  broad-
           cast  station  configuration.   Changes to the station
           configuration parameters do not take effect until  the
           Add or Change button is pressed. If the the configura-
           tion parameters are changed  for  a  station  that  is
           currently broadcasting, the new configuration will not
           take effect until the station  is  powered  off.  Add,
           Change, and Delete also cause the current station list
           and program parameters to be written out to  the  ini-
           tialization file.

     Input Volume
           may be used to manually adjust the  audio  input  gain
           level.  It is only enabled when broadcasting data from
           an audio device (as opposed to a pre-recorded file).

     Auto Volume Adjust
           enables an automatic gain control algorithm that moni-
           tors  the  input  volume level and adjusts it when the
           audio data is too soft  or  too  loud.  The  algorithm
           tends to be cautious, lowering the volume quickly when
           it is too loud, but raising the level slowly to  avoid
           the noise-pumping effects characteristic of cheap tape
           recorders. This control is only  enabled  when  broad-
           casting  data from an audio device. The station confi-
           guration panel comes up by default in  an  abbreviated
           form,  displaying  only  the Station option.  The plus
           (+) button in the lower right corner causes the window
           to  expand  to  display additional transmit parameters
           for  the  selected  station.  The  following  sections
           describe  all  of the station configuration panel con-
           trols:

     Station
           is a text field in which a  four-letter  station  name
           may  be  entered. The station name is used to identify
           your broadcast program.

     Sign-On File
           specifies an audio file that  is  broadcast  when  the
           transmitter is initially powered on.

     Audio Input
           specifies the source of audio data for the normal sta-
           tion broadcast.

     Sign-Off File
           specifies an audio file that  is  broadcast  when  the
           transmitter is powered off.

     Auto-Shutoff
           determines the action to be taken when the audio input
           source  is  silent.  When  this option is enabled, the
           station will automatically sign off if there has  been
           no  audio  input for a full minute.  If this option is
           disabled, the station will continue to broadcast  sta-
           tion  identification  packets,  but  will suppress the
           broadcasting  of  audio  data  until  some  sound   is
           detected.

     Audio Format
           selects the audio data format that will  be  transmit-
           ted.   The  uncompressed  format  causes 8000 bytes of
           audio data to be  broadcast  each  second.  Compressed
           data  sends  only  4000 bytes per second, but requires
           more  computation  on   both   the   transmitter   and
           receivers.

     Multicast Addr
           specifies   the   network   broadcast   address   (see
           radio_xmit(6) for more information on the IP Multicast
           implementation). The special string  BROADCAST  causes
           the  program  to transmit UDP Broadcast packets (which
           will not be relayed over a network gateway).

     Multicast Hops
           specifies the number  of  network  gateways  that  RFE
           broadcast packets may traverse.

FILES
     ~/.radiorc
           startup initialization file for radio and xmit

SEE ALSO
     radio(6), radio_recv(6), radio_xmit(6)

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