     Serial1.begin(115200); // start Serial1 on Leonardo
   #endif
   // Calibration factor = CT ratio / burden resistance = (100A / 0.05A) / 33 Ohms = 60.606
-  ct1.current(1, 60.606); // range of 58.18 to 63.02 for shield and default x with range 86.35 – 95.45 emonTx
+  ct1.current(1, 60.606); // range of 58.18 to 63.02 for shield [default 90.9 with range 86.35 – 95.45 for emonTx 22 Ohms]
   ct2.current(2, 60.606);                                     
   ct3.current(3, 60.606);
-  ct4.current(4, 60.606); 
+  // CT 4 is high accuracy @ low power - 4.5kW Max for emonTx but NOT shield (2000 turns / 120 Ohm burden resistor = 16.66 for emonTx) 
+  ct4.current(4, 58.50); // shield doesn't have high accuracy CT4, normal 33 Ohms
   
   /* (ADC input, calibration, phase_shift)  // use CalVRef.ino sketch to get READVCC_CALIBRATION_CONST 1115000L for Leonardo
   default normally: ct1.voltage(0, 300.6, 1.7);         // Robert thinks new CT's might need 1.85
   */
-  ct1.voltage(0, 268.8, 1.25);      // phase 1.7 default is calculated by comparing real and apparent with 100% PF device                  
-  ct2.voltage(0, 265.8, 1.25);                                
-  ct3.voltage(0, 265.8, 1.25);      // 268.97 per https://learn.openenergymonitor.org/electricity-monitoring/ctac/calibration
-  ct4.voltage(0, 265.8, 1.25);
+  ct1.voltage(0, 268.97, 1.205);      // phase 1.7 default is calculated by comparing real and apparent with 100% PF device                  
+  ct2.voltage(0, 268.97, 1.205);      // was 265.8, 1.25                          
+  ct3.voltage(0, 268.97, 1.205);      // 268.97 per https://learn.openenergymonitor.org/electricity-monitoring/ctac/calibration
+  ct4.voltage(0, 268.97, 1.205);
   
   // Setup indicator LED
   pinMode(LEDpin, OUTPUT);                                              

/*
  ArduinoShield.ino for Leonardo or Uno WAS LeoShieldCT1234v3.ino with DS18B20 option from:
  https://github.com/openenergymonitor/emontx-shield/blob/master/firmware/Shield_CT1234_Voltage_SerialOnly/Shield_CT1234_Voltage_SerialOnly.ino
  EmonTx CT1234 Voltage Serial Only example 
  Part of the openenergymonitor.org project 
  Licence: GNU GPL V3 

        Serial1.print(emontx.temp[j]);
      }
    }
    Serial1.print(",mA:");Serial1.print(int(ct4.Irms * 1000));  // TODO ONLY amps from one CT for apparent power calcs
    Serial1.println();
    delay(50);
#endif  
