Spectrum Analyzer Menus
6–16
2715 User Manual
16. Press [X] when the title is complete.
17. Press [2] to select STORE.
18. Choose any unused antenna number.
The new or modified antenna table will be stored under that number. Its
name is displayed adjacent to the number. If you do not name the antenna, it
is given a name of ANTENNA #. If all five antenna tables are already in use,
you will have to delete an existing antenna before you can store the new or
modified table. For instance, suppose you have modified an existing antenna
table and wish to store the modified version in the place of the original table
using the same antenna name. Even though the name and location are the
same, you must first delete the original antenna table. Deleting the original
antenna from the antenna list does not delete the edited version in the local
buffer. After you delete the original, store the edited version in the original
location.
You can print the antenna data if your 2715 is equipped with an optional
communications port and appropriate printer.
19. To print the antenna data, select item 5, PRINT, from EDIT ANTENNA
TABLE.
20. Choose the antenna data you want to print from the resulting list.
The DISPLAY LINE feature ([DSPL] [8]) can be used with the dB
µ
V/m for
making vehicular surveys of leakage from cable TV installations, or in other
applications where an audible alert is useful whenever a signal amplitude crosses
a preset threshold. To sound a high-level alert whenever the measured RF field
strength exceeds the threshold, set the DISPLAY LINE at the desired threshold.
See The Display Line and Limit Detector on page 6–40 for complete details.
To look for very low amplitude RF energy, turn on the 2715’s preamplifier.
Actual sensitivity depends on the antenna used and losses in cabling and
coupling to the 2715. With minimum cable losses and an antenna that matches
the 75
W
2715 impedance, you should be able to see signals ranging from
approximately 2 dB
m
V/m (1.3
m
V/m) at 55 MHz to 14 dB
m
V/m (5
m
V/m) at
216
Ă
MHz.
If greater sensitivity is required, the following three options are possible:
H
Provide an external preamplifier
H
Use a higher-gain antenna; sensitivity increases directly as antenna gain
H
If the signal being measured is narrowband, reduce the RBW to the
narrowest setting still capable of passing the signal; for instance, the 3 kHz
filter increases sensitivity by a further 20 dB over the 300 kHz filter
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