68
Installation
TB9400 Installation and Operation Manual
© Tait International Limited
November 2019
H-Band
Before the base station is installed on site, you may need to tune the
receiver front end. The receiver front end requires tuning if the receive
frequency is shifted more than 5MHz away from the previously set
frequency, or the RSSI level of the new frequency is more than 1dB lower
than the RSSI level of the previously set frequency.
Tait can provide extender cables (TBC Reciter Power Cables) to enable
tuning with a subrack or from a bench power supply. To order these, the
part number is T01-01150-0001.
The receiver in the H-band reciter covers one of the following frequency
sub-bands, depending on the model:
■
H1 - 400 to 440MHz
■
H2 - 440 to 480MHz
Each sub-band uses the same helical filter (shown in
below).
The bandwidth of the helical filter is approximately ±5MHz.
The HH-band variant has no helical filter, so does not require tuning.
To check the RSSI level and tune the receiver front end (if required), follow
these steps.
1.
Remove the reciter from the subrack and reconnect the system
control bus cable to power up the reciter.
2.
Log in to the reciter and select Monitor > Interfaces > RF Interface.
For information on connecting directly to the reciter, refer to
Connection to a Base Station” on page 91
Figure 4.4
Identifying the H-band receiver front end helical filter
H-band helical filter
