sunair RT-9000C, Operation And Maintenance Manual, Page: 247 / 393

Document No. 8128000560
Software Revision – N1B (07 Oct 04)
7-15
RT-9000 B
7.3.2.4 ANTENNA COUPLER TUNING
When the RT-9000 B is using a Non-resonant Antenna, an Antenna Coupler must be installed between the
RT-9000 B and Antenna. When the RT-9000 B is driving an external Linear Power Amplifier (such as the
LPA-9600) that uses a Non-resonant Antenna; an Antenna Coupler must be installed between the LPA-9600
and Antenna. In both cases, the Antenna Coupler becomes the feed point for the Antenna. Transmitter RF
Output Power capability is a primary factor in determining which Antenna Coupler model must be used.
Typically, the RT-9000 B Transceiver and the LPA-9600 Linear Power Amplifier will use models CU-9125 and
CU-9150 Antenna Couplers, respectively.
Refer to Figure 7.3.2.2. When an Antenna Coupler is present in the system, depressing the Coupler Tune
(‘CPLR TUNE’) key at
8 , will initiate an Antenna Coupler “Tune Cycle”. During the Tune Cycle, the RT-
9000 B Operational Display will display the following message:
‘COUPLER TUNING’
After the Antenna Coupler Tune Cycle finishes and successfully tunes the Antenna, a message will appear in
the RT-9000 B Operational Display and tell the operator the system is ready for use. This message will
appear for about three (3) seconds and then automatically return to the normal channel information display.
This message is as follows:
‘SYSTEM READY’
If the Antenna Coupler is not able to tune the Antenna within 20 seconds, a message will be displayed
informing the operator of that result. This message will appear for about three (3) seconds and then
automatically return to the normal channel information display. If this result occurs, the Antenna Coupler and
Antenna should be checked for any obvious problem. If all appears to be in order, consult the troubleshooting
section of the Antenna Coupler manual.
‘SYSTEM FAULT’
If the Antenna Coupler develops a Fault or the remote RT-9000 B does not receive the expected handshake
signals from the Antenna Coupler, the following message will be displayed. This message will appear for
about three (3) seconds and then automatically return to the normal channel information display. If this result
occurs, consult the troubleshoot section of the Antenna Coupler manual. This message is as follows:
‘COUPLER FAULT’
7.3.2.5 MANUAL TUNING
The manual tuning function permits the RT-9000 B Transceiver’s operating frequency to be changed by
rotating the ‘TUNING’ control. After an operating frequency has been established as described in section
7.3.2.2, rotating the ‘TUNING’ control clockwise increases frequency; counter-clockwise rotation decreases it.
The rate of operating frequency change for a given amount of ‘TUNING’ control rotation is selectable. Four
(4) different Tuning Rates (or “steps”) are available.