16  FieldFox User’s Guide  
Top Panel 
 
For CAT and NA measurements, use to make reflection measurements. 
Maximum: ±50 VDC, +27 dBm RF 
CAT Mode on page 20 
NA Mode on page 38 
For SA, use to make all measurements.  
For CAT, NA, and VVM mode, use to make Port 2 transmission 
measurements. 
Maximum: ±50 VDC, +27 dBm RF. 
For use with built-in GPS. Produces a 3.3 VDC bias voltage for the antenna 
pre-amplifier. Use with a GPS antenna such as N9910X-825. Other GPS 
antennas can also be used.   
Frequency Reference Source and External Trigger Input signal.  
Maximum: 5.5 VDC. 
Freq. Ref on page 181. 
Ext Trig (SA Mode) on 
page 94