User's Manual
Table Of Contents
- Installation and Operation Manual
- Contents
- Preface
- 1 Description
- 2 General Safety and Regulatory Information
- 3 Operation
- 4 Working with Base Stations from Your PC
- 5 Installation
- 6 Maintenance
- 7 Troubleshooting
- 8 Replacing Modules
- Appendix A – Interface Pin Allocations
- Appendix B – Inter-Module Connections
- Glossary
- Tait Software License Agreement
- Directive 1999/5/EC Declaration of Conformity
DRAFT 1
TB9300 Installation and Operation Manual Installation 87
© Tait Limited May 2013
5.6.6 Connecting an External Frequency Reference
An external reference frequency is not normally required for B3 band.
However, an external reference can be used when you need to maximize
the range of the base station. For K4 Band, the internal frequency reference
accuracy is inadequate, and an external reference must be used. The
external reference frequency can be 10MHz or 12.8MHz, with an input
level of 300mV
pp
to 5V
pp
. The stability of this reference should be better
than 50 parts per billion. The reciter automatically detects the frequency of
the external reference and configures itself accordingly.
If an external reference is required, enable the external reference “Absent”
alarm (Configure > Alarms > Control).
Use a 50Ω coaxial cable (RG58 or RG223) to connect the external
reference to the base station’s external reference frequency input. You can
daisy-chain up to eight base stations using F-junctions. The maximum
overall cable length is 30m. Terminate the last connection with a 50Ω load.
Figure 5.11 Daisy-chaining an external frequency reference input
50Ω termination
maximum of eight base
station loads on one
frequency reference output
maximum overall cable
length is 30m