LAPLACE INSTRUMENTS RF200 User Manual - page 7
RF200/500 user manual
7
2.3 Antenna Factor
The sensitivity of any antenna will vary with frequency. i.e. it will be more sensitive at
some frequencies and less sensitive at others. A plot of sensitivity vs frequency is
called the Antenna Factor.
The SA1000 Windows software has the antenna factor for the RF200 broadband
antenna ready installed. Selecting this item in the INPUT menu automatically applies
the appropriate conversion to read out in absolute field strength.
WARNING: Although the conversion is valid, the field strength measured by the
antenna is subject to your test site conditions and configuration and may be subject to
gross errors. Reception of emissions radiated from the UUT depend on the test
conditions, the test site, reflections, ground plane, background radiation, UUT to
antenna distance etc..etc.. Be very wary about relating field strengths to limit lines
unless you have some known test results to act as a reference.
Fig 3(a) RF200 Antenna factor, linear frequency scaling.
Note. Antenna factor includes SA1020 Pre-amplifier and 5 metres co-ax cable.
A.F. (dB)
-15
-12.5
-10
-7.5
-5
-2.5
0
2.5
5
7.5
10
12.5
15
0
100
200
300
400
500
600
700
800
900
1000
Frequency (MHz)
A
n
te
nn
a
g
a
in
(
d
B)
A.F. (dB)
Fig 3(b) RF200 Antenna Factor, Log frequency scaling
Note. Antenna factor includes SA1020 Pre-amplifier and 5 metres co-ax cable.
A.F. (dB)
-15
-12.5
-10
-7.5
-5
-2.5
0
2.5
5
7.5
10
12.5
15
10
1000
Frequency (MHz)
A
n
te
nn
a
g
a
in
(
d
B)
A.F. (dB)