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Chapter 1
General Information
Introduction
This chapter provides a description, performance specifications, optional accessories, pre
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ventive maintenance, and calibration requirements for the Site Master model S251B.
Throughout this manual, the term Site Master will refer to the S251B.
Model
Frequency Range Ports
S251B 625 to 2500 MHz 2
Description
The Site Master is a hand held SWR/RL (standing wave ratio/return loss), transmission
gain/loss and Distance-To- Fault (DTF) measurement instrument that includes a built-in
synthesized signal source. All models include a keypad to enter data and a liquid crystal
display (LCD) to provide graphic indications of SWR, RL or dB over the selected fre-
quency range and SWR or RL over the selected distance. The Site Master is capable of up
to 2.5 hours of continuous operation from a fully charged field-replaceable battery and can
be operated from a 12.5 dc source. Built-in energy conservation features can be used to ex-
tend battery life over an eight-hour work day.
The Site Master is designed for measuring SWR, return loss, or one-port cable insertion
loss and locating faulty RF components in antenna systems. Power monitoring is available
as an option. Site Master model S251B includes transmission gain or loss (S21) measure-
ments and an optional built-in bias tee. The displayed trace can be scaled or enhanced with
frequency markers or a limit line. A menu option provides for an audible “beep” when the
limit value is exceeded. To permit use in low-light environments, the LCD can be back lit
using a front panel key.
Standard Accessories
The Software Tools PC-based software program provides a database record for storing
measurement data. Site Master Software Tools can also convert the Site Master display to a
Microsoft Windowsä 95/98/NT workstation graphic. Measurements stored in the Site Mas
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ter internal memory can be downloaded to the PC using the included null-modem serial ca
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ble. Once stored, the graphic trace can be displayed, scaled, or enhanced with markers and
limit lines. Historical graphs can be overlaid with current data, and underlying data can be
extracted and used in spreadsheets or for other analytical tasks.
The Site Master Software Tools program also performs DTF (Distance To Fault) and Fault
Location.
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