Magnetic disturbances (in nT) produced by our PTTs (all distances relative to its centre of mass)
| . | Distance in front of PTT (cm) . | . | . | . | . | . | . | . | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | 10 . | 15 . | 20 . | 25 . | 30 . | 35 . | 40 . | 45 . | ||||||||
| Transmitting and silent transmitter | ||||||||||||||||
| x | −271 | −190 | −125 | −85 | −49 | −35 | −26 | −18 | ||||||||
| y | 17 207 | 17 225 | 17 229 | 17 230 | 17 239 | 17 239 | 17 239 | 17 242 | ||||||||
| z | 44 466 | 44 479 | 44 473 | 44 465 | 44 458 | 44 450 | 44 447 | 44 443 | ||||||||
| Change in field strength | ||||||||||||||||
| x | −260 | −179 | −114 | −74 | −38 | −24 | −15 | <10 | ||||||||
| y | −33 | −15 | −11 | −10 | <10 | <10 | <10 | <10 | ||||||||
| z | 26 | 39 | 33 | 25 | 18 | 10 | <10 | <10 | ||||||||
| . | Distance in front of PTT (cm) . | . | . | . | . | . | . | . | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | 10 . | 15 . | 20 . | 25 . | 30 . | 35 . | 40 . | 45 . | ||||||||
| Transmitting and silent transmitter | ||||||||||||||||
| x | −271 | −190 | −125 | −85 | −49 | −35 | −26 | −18 | ||||||||
| y | 17 207 | 17 225 | 17 229 | 17 230 | 17 239 | 17 239 | 17 239 | 17 242 | ||||||||
| z | 44 466 | 44 479 | 44 473 | 44 465 | 44 458 | 44 450 | 44 447 | 44 443 | ||||||||
| Change in field strength | ||||||||||||||||
| x | −260 | −179 | −114 | −74 | −38 | −24 | −15 | <10 | ||||||||
| y | −33 | −15 | −11 | −10 | <10 | <10 | <10 | <10 | ||||||||
| z | 26 | 39 | 33 | 25 | 18 | 10 | <10 | <10 | ||||||||
PTT, platform transmitter terminal.
Magnetic disturbance was measured by a high-precision three-axial flux gate magnetometer (MEDA FVM-400).
Reference values (natural field, no transmitter): x=−11; y=17,240; z=44,440, where x defines the direction towards the bill, y defines the direction perpendicular to the bill(positive to the left of the bill, negative to the right of the bill) and z defines the vertical component (positive towards the earth,negative towards the sky).
nT, nano Tesla; PTT, platform transmitter terminal.
Bold values are the magnetic disturbances from our transmitter fixed 30-33 cm from the head of the birds when flying.