Read TTL Signal and print it to Serial?

[system]

void setup()  
{
  Serial.begin(115200);
  Serial.println("Start");
  Serial1.begin(115200);
}

void loop()                     // run over and over again
{

  if (Serial1.available()) {
     // if((int)Serial1.read() != 128 && (int)Serial1.read() !=0 && (int)Serial1.read() != -1)
      {
        Serial.print((char)Serial1.read());

      }
  }
}

ok.. that works... but i get a lot of wrong characters... do i miss something that cleans up the signal?

Example output:

üúå­V˝addrmss"from /tmp/bootloader_channel.conf
Current system time is 946684855
Scanning infocast channel 220,
.2.2:22222
Setting tZ[Y«Ñto 10 seconds
UP BR*
n
MQRUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0úg{¯«z2-
  "       TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 


J¹?сaddr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1