User`s guide

3. Set the source to 300.2 MHz, so that the signal is 200 kHz higher than the calibration signal.
Set the amplitude of the signal to -80 dBm (60 dB below the calibration signal).
4. Set the 300 MHz signal to the reference level by pressing [PEAK SEARCH), [MKR), then
MARKER -+REF LVL .
If a 10 kHz filter with a typical shape factor of 15: 1 is used, the filter will have a bandwidth
of 150 kHz at the 60 dB point. The half-bandwidth (75 kHz) is narrower than the frequency
separation, so the input signals will be resolved.
4-J
MKR 300.010 MHz
REF -23 7
dBrn AaTTEN
10 dB
0
-23 86 dBm
PEAK
LOG
10
dB/
MARKER
300.010 MHz
-23.86 dBm
CENTER 300 000
MHZ
SP,%hl 2
000 MHZ
RES EW 10
kHZ
YBW 10
kHZ
SW 60 msec
Figure 3-4. Signal Resolution with a 10 kHz Resolution Bandwidth
If a 30 kHz filter is used, the 60 dB bandwidth will be 450 kHz. Since the half-bandwidth
(225 kHz) is wider than the frequency separation, the signals most likely will not be resolved.
See Figure 3-5. (To determine resolution capability for intermediate values of amplitude level
differences, consider the filter skirts between the 3 dB and 60 dB points to be approximately
straight. In this case, we simply used the 60 dB value.)
4
MKR
300 010 MHz
REF -23 7
dBm ATTEN
10 dB
0
-23 87 dBm
PEPK
LOG
In
,1! I
IW
dB/
i \
.-
RES EW
30 kHZ
\
CENTER 3Ub3.000
MHz
SPAN 2
000 MHz
#RES BW 38 kHL “BW 30
kHL SW 20 msec
Figure 3-5. Signal Resolution with a 30 kHz Resolution Bandwidth
Making Basic Measurements 3-5