Atec Anritsu-S332D-31D - Manual (Page 4)

4
FDR Technique
Frequency Domain Reflectometry, (FDR), and Time Domain Reflectometry, (TDR), have similar acronyms, and both
techniques are used to test transmission lines. But, that’s where the similarities end. TDRs are not sensitive to RF problems:
the TDR stimulus is a DC pulse, not RF. Thus, TDRs are unable to detect system faults that often lead to system failures.
Additionally, FDR techniques save costly, time-consuming trouble shooting efforts by testing cable feed-line and antenna
systems at their proper operating frequency.
Deficient connectors, lightning arrestors, cables, jumpers, or antennas are replaced before call quality is compromised.
Quick, Simple Measurements
Site Master performs various RF measurements aimed at simplifying cable feedline and antenna analysis: Return Loss,
SWR, Cable Loss and Distance-to-Fault (DTF). A single key selection on the main menu activates the desired measurement
mode.
Cable and Antenna Analysis – Increase System Uptime
Return Loss, SWR
Return Loss and SWR “system" measurements ensure conformance to
system performance engineering specifications. Measurement easily toggles
between either one of the two modes and can be performed without climbing
the tower.
Cable Loss
Cable Loss measurements measure the level of insertion loss within the cable
feed-line system. Insertion loss can be verified prior to deployment, when you
have access to both ends of the cable, or on installed cables without access to
the opposite end. Site Master automatically calculates and displays the average
cable loss so there is no more guess work or a need to perform calculations in
the field.
Distance-to-Fault
Although a Return Loss test can tell users the magnitude of signal reflections,
it cannot tell the precise location of a fault within the feed-line system.
Distance-To-Fault measurements provide the clearest indication of trouble
areas as it tells us both the magnitude of signal reflection and the location of
the signal anomaly.
Distance-To-Fault measurement capability is built into all Site Master models as
a standard feature. Return Loss (SWR) measurement data is processed using
Fast Fourier Transform and the resulting data indicates Return Loss (SWR)
versus distance. Distance-to-Fault measurements indicating Return Loss or
SWR versus time is available with Handheld Software Tools
™ .