5-7
The peak held spectrum scan shown in figure below is an example of
a fully-loaded reverse band. Services carried include: telephony, data
(cable modem), and PCS. One also sees a few CW signals at the high
and low end of the band providing a consistent signal for the reverse
laser. The spectrum scan is 45 MHz wide (5 to 50 MHz) or 4.5 MHz
per division. A look at the spectrum indicates that these frequencies
and bands should be omitted, namely : 6, 15-16.5, 18.5-20, 22.5-27.5,
29-30.5, 31-32.5, 33-36, 36.5-38, 40 and 41-42.5.
The best way to set up the Stealth reverse sweep channel plan is to
build a plan with 250 kHz sweep insertion points from 5 to 45 MHz
and then delete points that fall within the service frequencies. A
close look at the peak held scan, using a marker, may indicate
frequencies within the bands specified above for insertion points
(34.5 MHz, for example).
To setup the Reverse Sweep on the 3SR, press the
SETUP
key and
select the “Sweep Receiver” option from the Setup menu. The
Sweep Receiver setup screen will appear.
IMPORTANT: The 3SR must contain the Reverse Sweep Option to
access the Reverse Sweep setup items.
Summary of Contents for 3SR
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