YBA250 Antenna and Transmission Line Analyzer User Manual

Glossary
Return Loss. Return Loss is a ratio of the power sent to the antenna
versus the power reflected by the antenna. A larger Return Loss is
better because less power is reflected.
Reverse Frequency. The frequency the mobile unit uses to transmit to
the base station. Also called uplink frequency, reverse channel or
uplink channel.
Span. The frequency range covered by the display graph.
TMA. Acronym for Tower-Mounted Amplifier.
Two-Port Measurement. Two-port measurements, also known as
transmission measurements, provide insertion gain and loss
measurements such as filter response (loss) versus frequency and
tower-mounted amplifier (TMA) gain versus frequency. Both a
YBA250 and YBT250 module must be installed on the NetTek
Analyzer to perform two-port Insertion Gain/Loss measurements.
The YBA250 module injects a signal into the device or system under
test, and the YBT250 module receives and measures the resultant
signal.
Velocity of Propagation. The Velocity of Propagation is the velocity at
which a signal travels through the cable. Velocity of propagation is
expressed as a fraction of the speed of light. A Velocity of Propagation
equal to 1 means that the signal is traveling down the cable at
the speed of light. A Velocity of Propagation equal to 0.5 means that
the signal is traveling down the cable at half the speed of light.
VSWR. VSWR (Voltage Standing Wave Ratio) is a measure of the
ratio of the maximum resultant voltage to the minimum resultant
voltage along a transmission line. It represents the amount of
impedance mismatch between the transmission line and the load. For
VSWR, the lower the number, the better. The best possible VSWR is
1.0, which means the impedance of a transmission line and its load
match perfectly.
Glossary- 2
YBA250 Antenna and Transmission Line Analyzer User Manual