Maintenance Manual

INSTALLATION AND MAINTENANCE MANUAL
Tsunami FAMILY
SPREAD SPECTRUM RADIOS
SEPTEMBER 1999
PAGE 4-2 SECTION 4: TROUBLESHOOTING
4.2 Changing Frequency Plans
The Tsunami RF frequency selections are listed in Section 3.5. The near-end radio and the far-
end radio must be corresponding (e.g. A1 / A2). The frequency of a given Tsunami terminal is set
by the specific filter, the physical orientation of this assembly, and the setting of corresponding
DIP Switches. (See Section 3.12.1 for more details.)
With respect to a given filter, the frequencies are fixed, because tuned RF filters are required for
normal operation. Changing of the (pretuned) radio frequencies may be required when installing
spares or for special situations, such as interference mitigation. This is accomplished by installing
an alternate filter or reorienting the existing filter.
For any given model of Tsunami, the frequency channel can be changed by swapping and /or
reorienting the filter.
It is not necessary to remove the cover assembly of the Tsunami
1. Remove any cables connected to the antenna connector on the diplexer (filter) and then
remove the two screws which mount the filter to the Tsunami chassis.
2. Slowly remove the filter from the chassis being careful to not endanger the cables that are
connected to the rear side of the filter.
3. Disconnect the two SMA connectors that are attached to the rear of the filter with a 5/16”
open end wrench.
4. Select the new filter or orient the existing filter such that the frequency channel label on the
filter (showing the DIP switch positions) is right-side-up corresponding to the desired
frequency channel.
5. Connect the two SMA connectors to the new or reoriented filter with the 5/16” open end
wrench.
6. Slowly place the wired filter assembly so that it is flush with the rear panel.
7. Install the two screws which mount the filter to the rear panel.
8. Refer to the rear panel filter label or Section 3.12.1 for DIP Switch settings to correspond to
the new filter and reattach the antenna cable.
As an example, the filter assemblies of an A1 and A2 terminal are
identical. They are simply installed differently. An A1 terminal can
be changed into an A2 by removing the filter and rotating it 180
degrees and reinstalling the filter. The DIP switch positions need
to match the filter orientation, per the appropriate filter label.