2 Scanner radio feeds to one source?

[Andrew033009]

Hello all


This may sound a bit confusing, but I see other feeds on Broadcastify doing it, so I thought I'd ask.

I have a railroad radio feed monitoring multiple channels, and a lot of the time it is channels talking over other channels (if that makes sense)

BASICALLY, I'd like to know if its possible to put a "splitter" into the coax cable to make the same antenna feed go into 2 seperate scanners, one monitoring a certain channel, and the other scanning the other few channels, and feeding it into one stream. I understand the audio would be mono, but how/if can I make this work?
Thanks.

 

[SurgePGH]

This is possible. You'd be better off using a multicoupler to split the antenna for use with multiple scanners. Then the audio could be fed one into the left channel and the other into the right channel.

 

[n5ims]

Now it is possible to use two scanners on different frequencies to feed the left and right channels on a stereo feed independently. That would allow both frequencies to be fed simultaneously and with some work on the listener's part, allow them to be heard independently. With most scanner apps using just the phone's mono audio feed when both are transmitting at the same time it could sound like two very loud people yelling different things at the same time.

 

[mass-man]

"... it could sound like two very loud people yelling different things at the same time.!"

I see you've met my wife!!!

 

[xicarusx]

Hello all


This may sound a bit confusing, but I see other feeds on Broadcastify doing it, so I thought I'd ask.

I have a railroad radio feed monitoring multiple channels, and a lot of the time it is channels talking over other channels (if that makes sense)

BASICALLY, I'd like to know if its possible to put a "splitter" into the coax cable to make the same antenna feed go into 2 seperate scanners, one monitoring a certain channel, and the other scanning the other few channels, and feeding it into one stream. I understand the audio would be mono, but how/if can I make this work?
Thanks.

I suggest using 2 RTL-SDR dongles and RTL_Airband compiled with nfm for this. You can mix the audio together to the same output.

Example Config:

# Example configuration file for 2 dongles.
# First dongle - scanning mode, NFM modulation, one frequency,
# output to mixer1
# Second dongle - scan mode, two channels:
# output to mixer1
#
#
# Mixer1 outputs to icecast server and to file
#
#

mixers: {
  mixer1: {
    outputs: (
        {
          type = "icecast";
          server = "icecast.server.example.org";
          port = 8080;
          mountpoint = "mixer1.mp3";
          name = "Rail OPS"
          genre = "Rail";
          username = "source";
          password = "mypassword";
        },
        {
          type = "file";
          directory = "/home/pi/recordings";
          filename_template = "mixer1";
        }
    );
  },
};

devices:
({
  type = "rtlsdr";
  serial = "00000001";
  gain = 25;
  correction = 0;
  mode = "scan";
  channels:
  (
    {
      modulation = "nfm";
      freqs = ( 161.160 );
      labels = ( "Train to Dispatch"  )
      outputs: (
        {
      type = "mixer";
      name = "mixer1";
      ampfactor = 1.0;
      balance = 0.0;
    }
      );
    }
  );
 },
 {
  type = "rtlsdr";
  serial = "00000002";
  gain = 25;
  correction = 0;
  mode = "scan";
  channels:
  (
    {
      modulation = "nfm";
      freqs = ( 161.152, 161.400 );
      labels = ( "Road and Dispatcher" "Yard" )
      outputs: (
        {
      type = "mixer";
      name = "mixer1";
      ampfactor = 1.0;
      balance = 0.0;
    }
      );
    }
  );
 }
);