WaveCom Electronics Inc
TR2126SE Manual; ml_tr2126se_04 (May 2003)
Approved: C.H.
14
3.0 TUNING THE ANTENNA
Note: This section applies only to TR2126SE transceivers fitted with the optional self-install
feature.
3.1 Preparation for Tuning
Before tuning the antenna insure that the Cable Modem is not connected to the power inserter. The Cable
Modem signal will prevent the signal strength indicator from responding to very weak receive signals.
3.2 Signal Strength and Alignment
The TR2126SE is equipped with an audible alignment aid that simplifies the setup process. It permits the
antenna to be aligned to the hub site without the use of the cable modem or any test equipment.
The aid consists of a level detector for the full receive band, and a beeper sealed into the unit that sounds at a
rate that increases with increasing level. The beeper is activated only for about 3 to 10 minutes each time
power is applied to the TR2126SE.
To use the aid, first mount the TR2126SE and the antenna with the antenna mounts left loose to permit
alignment. Connect the antenna to the TR2126SE ANTENNA port, and apply DC power to the TR2126SE
through the MODEM port when you are ready to begin. The beeper will start sounding. Point the antenna in
the general direction of the hub site, then move the antenna to maximize the rate of the beeper. The highest
rate heard represents the highest receive signal level and the best alignment. Tighten the antenna mounts.
The beeper will automatically mute between 3 and 10 minutes after the unit was powered up, turning off faster
with higher received signal level.
The detector operates over a wide level range. Installations that are closer to the hub site and consequently
receive a larger signal will have a higher beep rate than an installation further out. In each case, finding the
alignment with the highest beep rate indicates the best alignment.
Note that the TR2126SE alignment aid does not discriminate between signals in the receive band. If signals
other than those from the hub are present, this could result in a misalignment. In this case, a conventional
alignment technique would need to be employed.
3.3 Resetting the Beeper
To reset the timer for alignment, simply unplug the power supply from its AC connection. Wait 5 seconds, then
plug the power supply back into its AC connection. The beeper will begin beeping as soon as power is
available.
