Agilent Technologies 8560E User Manual page 121

Agilent technologies 8560 e-series and ec-series spectrum analyzers

Table of Contents

The user may want to add +7.25 dB to the (negative) ACP ratios

measured, to compensate for the difference between the standard and

the Agilent Technologies interpretation of its intent. The 8560 E-Series

and EC-Series implementation is consistent with that used in the

Agilent 85720A JDC/TDMA Measurement Personality.

PHS Measurements of Mobiles According to the

RCR-28 Standard

The following information is applicable as of September 1993. The

RCR-28 standard does not specify a ratio for adjacent channel power,

but rather an absolute power. The standard speciﬁes that the power be

computed as follows:

is the (absolute) adjacent channel power according to

the deﬁnition of standard RCR-28.

is the power measured in the adjacent channel using

the peak method.

is the power measured in the main channel, within the

channel bandwidth, using the peak method.

is the total power measured in the transmitted burst.

That is the average power measured in a wide

bandwidth, while the burst is "on."

Because the transmitter is speciﬁed to have at least 99% of its power

within a 288 kHz bandwidth, P

bandwidth, must be accurately measured.

according to the standard, we can make the following

measurements and computations:

is the ACP ratio in the adjacent channel (or alternate

channel). This result should be in decimal form,

converted from decibels by the equation:

where ACPdB is the ACP ratio in decibels (it is

always negative).

Example 9: Adjacent Channel Power Measurement

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, being measured in a 192 kHz

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Making Measurements