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Receiver Level Accuracy
a)
Set the LT51 to Level Spectrum and TX-RX interface mode
b)
Set the LT51 Zrtx impedance to terminated and the appropriate value in the
table.
c)
Connect a Level Oscillator (with the correct level for each impedance) to the
LT51 using a short low capacitance cable to the RTXa-b terminals.
d)
Set the Oscillator frequency to 10 kHz and Level to 0 dBm.
e)
Step down the levels in Table 8.3 and check that the readings are within the
ranges specified.
Oscillator Tx Level
0 dBm
0 dBm
0 dBm
+10 dBm
-10 dBm
-20 dBm
-30 dBm
-40 dBm
-50 dBm
Receiver Level Response
a)
Set the LT51 to Level Spectrum and TX-RX interface mode
Set the LT51 Zrtx impedance to 50 , terminated.
b)
Connect a 50 Level Oscillator to the LT51 using a short low capacitance
c)
cable to the RTXa-b terminals.
d)
Set the Oscillator level to 0 dBm and Frequency as indicated in Table 8.4.
e)
With the Oscillator Frequency set at 10 kHz, set the reference on the LT51.
Set the Marker to the peak and press the Zero Offset [f3] key.
f)
Step down the frequencies in Table 8.4 and check that the readings are
within the ranges specified.
Oscillator Tx Frequency
LT51 User Manual
Impedance
50
75
600
600
600
600
600
600
600
Table 8.3
10 kHz
200 Hz
1 kHz
200 kHz
1,000 kHz
2,000 kHz
Table 8.4
Performance Testing
LT51 reading
0 dBm ± 0.10 dB
0 dBm ± 0.10 dB
0 dBm ± 0.05 dB (ref)
+10 dBr 0.20 dB
-10 dBr 0.20 dB
-20 dBr 0.20 dB
-30 dBr 0.30 dB
-40 dBr 0.30 dB
-50 dBr 0.30 dB
LT51 reading
0 dBm ± 0.05 dB (ref)
0 dBr 0.25 dB
0 dBr 0.25 dB
0 dBr 0.25 dB
0 dBr 0.50 dB
0 dBr 0.50 dB
83
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