User's Manual

TB9300 Installation and Operation Manual Installation 63

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 and HC - 400 to 440MHz

■ H2 - 440 to 480MHz

■ H3 - 470 to 520MHz.

Each sub-band uses the same helical filter (shown in

Figure 4.4 below).

The bandwidth of the helical filter is approximately ±5MHz.

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

“Connecting a

Networked PC to a Base Station” on page 83.

3. Feed a signal at the currently tuned receive frequency and at a level of

–80dBm into the reciter’s RF input. Check that the RSSI reading on the RF

Interface page is –80dBm ±1dB. Note this reading.

Figure 4.4 Identifying the H-band receiver front end helical filter

H-band helical filter