www.spacelabshealthcare.com
2 - 2 0
U
L T R A V I E W
D
I G I T A L
T
E L E M E T R Y
-
S
E R V I C E
M
A N U A L
S
E T U P
Verification
1
Inject a known signal source into the antenna system at each
antenna: disconnect the antenna and inject the signal at the cable
that was attached to the antenna.
2
Troubleshoot any antenna legs that are ±2.5 dB different from the
othe antenna legs that have been measured for improper
installation of components or defective components.
3
Adjust the gain at the receiver housing from the gain specified in
the design to the actual gain by adding amplification or loss by
the receiver housing side of the antenna system. This value may
be different from side A to side B of the diversity antenna system.
On multiband antenna systems, adjust the 1400-MHz side of the
antenna system at the first amplifier above the down converter.
4
While wearing a transmittter, walk around the coverage area with
the antenna system monitored by a spectrum analyzer to verify
that signal levels do not drop lower than -85 dB for the 400 MHz
or 600 MHz antenna system, and -90 dBm for a 1400 MHz
antenna system. For a multiband antenna system, both the 600
MHz and 1400 MHz sides must be tested.
For further assistance with antenna system installations, or for
maintenance questions, contact a Spacelabs Healthcare field service
engineer.
Tools for Tracking Transmitter Channels
There are several methods to assist you in tracking transmitter
channels.
•
A Telemetry Spectrum Management Log (Refer to
Telemetry Spectrum Management Log Example
•
Frequency and Channel Tables [Refer to
and
on page 2-36 for the 91341 transmitter, and refer
on page 2-46 for the
91343/91347 transmitters.]
•
The WMTS Frequency Coordinator (www.ashe.org)
•
Your Spacelabs Healthcare Service Representative
