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Configuration steps
Configuring an Agilent 85301B/C antenna mea-
surement system involves the following steps. Each
step is described in detail in this guide.
1. Select the transmit source, amplifiers, cables
and method used to obtain the reference channel
signal, and determine the minimum transmit
power.
2. Determine the worst-case antenna range transfer
function based on range length, maximum test fre-
quency, and transmit antenna gain.
3. Calculate the estimated test channel power level
based on transmit power, range transfer function,
and expected test antenna gain.
4. Determine required measurement sensitivity
based on test channel power level, required mea-
surement dynamic range, and accuracy.
5. Select either an 85301B or 85301C antenna mea-
surement system depending on range type and
required microwave performance.
6. Configure the receive site.
7. Calculate the reference channel power level.
8. Review the complete configuration for accuracy
and completeness.
9. You may wish to review the completed configu-
ration with your Agilent Technologies sales repre-
sentative and/or systems engineer, or with
Nearfield Systems, Inc.
4
How to use this guide
You can use Figures 16 through 25 at the end of
this guide as worksheets for configuring your
antenna measurement system. The bubble numbers
in these figures (example:
value should be entered. These numbers corre-
spond directly with the bubble numbers by the
instructions in this guide. We recommend that you
photocopy Figures 16 through 25 and fill them in
as you go through the instructions.
General range parameters
1
Record the range type and length in Figure 16.
If a compact antenna test range (CATR) is to be
used, record the manufacturer and model number.
Transmit site configuration
The following steps are required to configure the transmit
site:
• Select the transmit source.
• Determine RF cable losses and transmit power
based on range type.
• Decide how the reference channel signal will be
obtained.
Transmit source selection
2
Record the required minimum and maximum
test frequencies for the antenna range in Figure 17.
Based on these frequency requirements, select a
transmit source from Table 1 below, check the
model number in Figure 17, and record its maximum
output power level at the upper test frequency on
Figure 17. Agilent recommends using only sources
with front panel controls; this will allow diagnos-
tics to be performed on the system if necessary.
The 1 Hz frequency resolution (Option 008) is
recommended for both the RF and LO sources to
allow the frequency resolution to be 1 Hz instead
of 1 kHz. While most users desire a 1 Hz frequency
resolution, it has the additional benefit of ensuring
that the signal presented to the receiver is within
its passband. If the system is to be used for mea-
suring antennas in pulsed mode of operation, fast
pulse modulation (Option 006) should be ordered.
1
) indicate that a
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