Bird Technologies 5000-EX - Manual (Page 29)

Operation
17
Selecting Measurement
The Bird Wideband Power Sensor can measure Aver-
age, Peak, and Burst power as well as Crest Factor
and CCDF. To select the measurement:
"
Press SHIFT to display the second set of softkeys.
Type should be key 2 and Filter should be key 3.
"
Press Type to cycle through the possible modes.
Video Filter
Except for average power and VSWR measurements,
all measurements use a variable video filter to
improve accuracy. This filter can be set to either
4.5 kHz, 400 kHz, or Full bandwidth. It should be as
narrow as possible while still being larger than the
demodulated signal bandwidth (video bandwidth).
Narrowing the filter limits the noise contribution from
interfering signals. Listed below are some common
modulation schemes and the appropriate video filter.
Video Filter Modulation Type
4.5 kHz CW Burst (Burst width > 150 µs), Voice
Band AM, FM, Phase Modulation, Tetra
400 kHz CW Burst (b.w. > 3 µs), GSM, 50 kHz AM,
DQPSK (¼
π, symbol rate < 24 k/s)
Full Bandwidth CW Burst (b.w. > 200 ns), CDMA, WCDMA,
DQPSK (¼
π, symbol rate < 200 k/s),
DAB/DVB-T