Change the frequency of an RT-Base radio modem

Change the frequency of an RT-Base radio modem
Change the frequency of an
RT-Base radio modem
Subtitle:
Date:
Version:
How to change the frequency of the RT-Base's Freewave radio modem
28/04/2015
150428
List of contents
1. Summary .......................................................................................................................................... 1 2. Procedure ......................................................................................................................................... 1 2.1. Access the radio modem ........................................................................................................... 1 2.2. Reprogram the radio modem..................................................................................................... 2 3. Verify the new settings work ........................................................................................................... 6 4. Revision History .............................................................................................................................. 6 1. Summary
If multiple base stations are operating in close proximity on the same frequency, it is possible for a
mobile unit to receive differential corrections from either base station.
This can potentially cause position jumps because the mobile unit will only use corrections from
one base station at a time—switching from one correction to the other if the connection to the base
station is lost.
This document explains how to change the frequency of a Freewave radio modem in the RT-Base to
prevent the mobile unit from receiving data from multiple base stations. You will need the
following software:

NAVsuite

Freewave Tool Suite, available from https://www.freewave.com/products/software.aspx
(requires user registration)
2. Procedure
2.1. Access the radio modem
1) Disconnect the Radio Configuration connector from the front panel and connect a serial cable:
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2) To access the Freewave radio modem you will need to remove the RT-Base's top panel.
Remove the 6 screws as shown below:
3) Gently lift the lid of the RT-Base; you should be able to see the Freewave radio modem.
2.2. Reprogram the radio modem
1) Open Freewave Tool Suite and select Configuration:
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2) Delete any discovered devices and template devices (select Template Devices, highlighted red):
3) Click Read Radio from the top menu:
4) You will see this text box appear:
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5) Press the setup button on the front of the radio modem (indicated below), then click OK.
6) Once the config has been read, click the Transmission Characteristics tab:
7) Click the drop-down menu for Hop Table Version, and select a frequency range:
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8) Ensure there isn’t any overlap between base stations (e.g. set one base station to 902-915 MHz
and the other to 915-928 MHz).
9) Click the All button:
10) Press the setup button on the front of the radio modem again when prompted.
11) To check the change has been applied correctly, follow steps 1 to 6 of this section and check the
frequency range (Hop Table Version) has updated when you reload the configuration.
12) It is important that the mobile unit is set to the same frequency range as the base unit otherwise
no radio link will be established.
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3. Verify the new settings work
1) If possible, position the mobile unit within range of 2 base stations that have been reconfigured
to transmit on unique frequency bands. The mobile unit should have been reconfigured to
receive data on only one of the frequency bands of the base stations.
2) Using the Performance window of Enginuity, check you are receiving differential corrections.
Depending on the type of unit and base station, your position mode will be Differential, RTK
Float or RTK Integer. In all cases, the Diff Age field, highlighted below, should remain below
2 s when receiving corrections.
3) Power down the base station providing the corrections.
4) The Diff Age field should begin to count up. RTK mode will remain for 60 s.
5) After 60 s, if another base station is available, the unit will start to receive corrections again.
The Diff Age reduces to <2 s and the position mode remains in RTK. This shows there is
another base station in the area outputting on the same frequency band.
6) If the position mode no longer shows as Differential, RTK Float or Integer, this shows the
mobile unit is not in range of another base station, or the base stations are on different
frequencies.
7) Note that low accuracy units e.g. RT3100 will only achieve Differential position mode. This
position mode is held for 5 minutes after differential corrections are lost.
8) It is worth noting on the base station and mobile radio modems the new frequency bands.
4. Revision History
Table 1
Revision
Changes
140731
Initial draft
150420
Document edit and format
150428
Document edit
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