GPS Antenna Signatures
A handy way to characterize components is with a power signature. This is done by stimulating two points (usually a node and ground) with an a.c. test signal. When voltage is plotted on the X axis of an oscilloscope and current is plotted on the Y axis an unique signature results. The test signal is a triangle wave with just enough amplitude to bias a transistor. The following signatures are of GPS antennae.
![](http://www.lidarus.com/wp-content/uploads/2018/03/Sokkia_SK-502.jpg)
S/N 6366
![ASH_701975-01](http://www.lidarus.com/wp-content/uploads/2018/03/ASH_701975-01-Copy.jpg)
S/N 5049
![](http://www.lidarus.com/wp-content/uploads/2018/03/NovaTel_GPS-600_NPM02270037-Copy.jpg)
![](http://www.lidarus.com/wp-content/uploads/2018/03/NovAtel_GPS-600.jpg)
SN: NPM02500030
![](http://www.lidarus.com/wp-content/uploads/2018/03/Sokkia_800078_GPS3.jpg)
S/N SM16220 (GPS 1)
![](http://www.lidarus.com/wp-content/uploads/2018/03/Sokkia_800078_GPS3-Copy.jpg)
S/N (GPS3)
![](http://www.lidarus.com/wp-content/uploads/2018/03/ASH_701008-01-Copy.jpg)
S/N GC16629