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25 July 1996
23 mm Transponder Reference Manual
Page 17 of 22
7.3 Measurement Set-Up: Transponder Signal Strength
The 23 mm transponder has to be located into a homogeneous field (Helmholtz set-up). The
pulsed power signal is generated by a signal generator. A calibrated field strength probe picks up
the transponder signal. The field strength can be calculated by using the calibration factor of the
field strength probe.
ANTENNA AXIS
PICK-UP
COIL
SIGNAL
GENERATOR
d
COILS
SPECTRUM
ANALYZER
TRANSPONDER
Figure 17: Determination of the transponder signal strength (data transmission signal
strength) with Helmholtz aperture
P o w e r
p h a s e
R e a d
p h a s e
U
t
T r a n s p o n d e r s ig n a l
P o w e r s ig n a l
N o i s e
Figure 18: Monitored signal voltage at the spectrum analyzer (time domain mode)