GPS antenna tuning
This page will describe al whole procedure on how the antena was tuned.
https://synzen.com.tw/products/lodestar antenna is used for the Rhino Tracker. This is the tuning process for air.
Schematic
Equipment
For GPS antenna tuning a MegiQ VNA-0460 VNA was used. VNA and cable were calibrated with custom calibration kit.
Measurements with recommended component values
Datasheet recommended component values
Because one of the component was not in stock at office w tried with 10pF instead of 8.2pF on C2
C13 - 15pF
C3 - 1pF
C2 - 10pF
L4 - DNP
Change recommended components 1
C13 - 15pF
C3 - 1.5pF
C2 - 11pF
L4 - DNP
Change recommended components 2
C13 - 15pF
C3 - 1.5pF
C2 - 6.8pF
L4 - DNP
Conclusion
At this point we saw that we are not getting anywhere.
Measurements with new pi network configuration
Measurements 1
C13 - 15pF
C2 - 1pF
C3 - 1pF
L4 - 1nF
Measurements 2
C13 - 15pF
C2 - 1pF
C3 - 1pF
L4 - 2.2nH
Measurements 3
C13 - 15pF
C2 - 1pF
C3 - 2.2pF
L4 - 2.2nH
Measurements 4
C13 - 10pF
C2 - 1pF
C3 - 2.2pF
L4 - 2.2nH
Measurements 5
C13 - 22pF
C2 - 1pF
C3 - 2.2pF
L4 - 2.2pF
Measurements 6
C13 - 10pF
C2 - 1pF
C3 - 3.3pF
L4 - 2.2nH
Measurements 7
C13 - 10pF
C2 - 3.3pF
C3 - 3.3pF
L4 - 2.2nH
Measurements 8
C13 - 10pF
C2 - 4.7pF
C3 - 3.3pF
L4 - 2.2nH
Measurements 9
C13 - 10pF
C2 - 4.7pF
C3 - 4.7pF
L4 - 2.2nH
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