LPT-3000 Remote User
’
s Guide
45
LP Technologies Tech Support
E-mail
, or Call
316-831-9696 Ext 0
Combiner
Input
RF Out
RF LEVEL
FREQUENCY
Synthesized Signal Generator
RF Out
RF LEVEL
FREQUENCY
Synthesized Signal Generator
[Figure 7-2] Setup for Input of Two Signals
⒝
Set the Center Frequency and the Span Frequency of the LPT-3000R communication program to
100MHz, and 1MHz/ VBW 100Hz respectively.
⒞
Set the second signal generator as 100.2MHz so that the signal is higher than the
first signal by 200kHz. Set signal amplitude as -90dBm (lower than the first signal by 60dB).
⒟
When using a RBW 10kHz filter with selectivity of 15 : 1 or less, the bandwidth of the filter
becomes 150kHz or less at the point of 60dB. Also, the half value of the resolving power
bandwidth (75kHz or less) becomes smaller than the frequency difference. Therefore, input signals
can be distinguished.
⒠
When using a RBW 30kHz filter, 60dB bandwidth becomes 450kHz or less. The half
value of bandwidth (225kHz) is wider than the frequency difference (200kHz). Therefore, signals
are almost undistinguishable.
⒡
When using a RBW 100kHz filter, a signal with drop of 200kHz is located within the
band of RBW 100kHz. Therefore, the signals cannot be distinguished at all. As such, signals can be
distinguished by adjusting RBW.