10-3 Custom Setup
Custom Setup Example
This example explains how to monitor several signals, plus a potential intermodulation
product, to see if there is a correlation between the nearby signals and an intermittent
interference problem.
The signals on or near the rooftop are:
•
An FM broadcast station at 106.5 MHz
•
A paging transmitter at 157.86 MHz
•
Three cellular sites:
- US CDMA PCS channel 50 (1932.5 MHz)
- AMP/EIA 553 channel 525 (885.750 MHz)
- GSM 1800 channel 512 (1805.2 MHz)
•
A Ham repeater at 147.36 MHz
•
A Ham repeater at 446.5 MHz
•
A land mobile repeater at 451.7875 MHz
•
A public safety repeater at 485.5625 MHz
•
In addition, the site is near the flight path of an airport. The approach frequency
is 121.4 MHz.
Set up a measurement channel for each of the signals to be observed plus extra channels for
any intermodulation products to be observed. After the channels are set up, press
File, Save, Recall, Delete, & Copy,
10-4
then
and name the setup for easy recall later.
Save Setup,
MS20xxA VNA Master UG 10580-00166 Rev. C
Chapter 10 — Channel Scanner, Option 27
and
Shift
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