User`s guide

Using the Radar function, a site test can be performed by placing one Radio Modem in
a fixed position, then walking around the site with the second radio modem. It is best
that the mobile unit be connected to laptop or PDA on which the radar test is run. The
results are then immediately accessible while you are wandering around the site.
A radio modem range test can also be performed in a similar fashion to the site test.
When the signal starts to become weak and packets are visibly being lost, the radio
modem is either nearing its operational limit, or interference due to signal reflections
and dropouts are becoming apparent. Increasing the height of both modem aerials
may improve the signal. Once the limit of the Radio Modem has been reached, a
reduction of the operating distance by at least 20% is recommended to ensure a
reliable link is achieved.
Note that the radar test may report missed packets that are not a direct result of
interference. Other radio modem pairs may be operating within radio range thus
causing occasional missed or corrupt radar response packets.
To perform the radar test the radio modem that is replying to the radar requests must
obviously be power up and operational. This does not necessarily mean that it should
be connected to a computer or other device. By turning DTR control off, then exiting
configuration mode, the radio modem will remain active and thus does not require to
be connected to a computer.
User’s Guide Modem Operation Explained 4-11