51
Model Three - Operation Manual
Digital Channels
You can use the Model Three to measure the average power of a
digital channel (QAM, QPSK, or COFDM) according to the configured
bandwidth. To do this, first set the Model Three’s channel type to DIGI
(see
Chapter 4: Setup, Channel Plan, Edit User Plan
).
The level for the signal is displayed, along with a P to indicate the
power level over the specified bandwidth for DIGI mode. Channel
parameters are also displayed, including Center Frequency,
Bandwidth, Modulation Type, and Symbol Rate.
To scan the channel spectrum, press the
LEVEL
LEVEL
4 JKL
key
again.
The Marker level indicated for a DIGI signal in the channel spectrum
mode is only the level at the marker frequency and not the total power
for the channel bandwidth. You can return to the single-channel level
mode (press the
LEVEL
LEVEL
4 JKL
key again) to read the total power of the set
bandwidth.
With a Digital Channel, the Scale, Reference,
Auto, Marker,
ΔΔΔΔΔ
Marker, and Average may be
used as described for TV Channels.
