Chapter 10
Measure Mode – Spectrum Tab
Field View
264
DSAM Help User Guide
Rev. 001
25
To set the Return Signal Generator Level to between 8 and 58
dBmV (68 to 118 dBµV) (-40.8 to 9.2 dBm), use the arrow keys to
highlight the
Enter Desired Level
field and press
ENTER
. Using
the arrow keys, step the
level
up or down, or use the alphanu-
meric keypad to enter the
level
, then press
ENTER
.
26
Press the
OK
softkey.
27
To enable or disable RGS Setup, press the
Settings
softkey.
28
Using the arrow keys, select
RSG On/Off
.
29
Press
ENTER
.
Understanding
Field View Results
Field View measurement mode views and analyzes ingress and distor-
tion on the upstream path (return path) as captured at a node return at
the headend or hub. It identifies the frequency at which ingress occurs
and displays the level value.
The Field View measurement mode graph continuously updates the
spectrum from the PathTrak or Phasor System as each frequency is
measured. This forms a graph across the entire frequency range.
When excessive ingress noise occurs at a specific frequency, the
measurement line develops a peak on the graph.
NOTE
To enable the Return Signal Generator the setting for the receiving
telemetry frequency must be 200 MHz or higher. The Return Signal
Generator CW output is a pulsing signal if a telemetry carrier is not
present.
Figure 243
Measure Mode – Field View
Graph
Graph Information Bar
Marker Information Area
21128026 R001 DSAM Help User Guide.book Page 264 Thursday, February 5, 2009 2:02 PM
