68 Installation TB9400/TN9275 Installation and Operation
© Tait International Limited May 2023
Tait networks are deployed with weak default passwords. For the sake
of security, Tait strongly recommends changing the default password
where applicable.
4.4.7 Tuning the Reciter and Receiver
The following table indicates which bands are manually tuned and which
are electronically tuned:
In this section “reciter” also applies to the receiver module (receive-
only reciter).
B1 Band The B1 band reciter does not require tuning.
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 Figure 4.3 below).
The bandwidth of the helical filter is approximately ±5MHz.
The HH band variant has no helical filter, so does not require tuning.
Band Manual Electronic
B1 ✗✓
HH ✗✓
H1 ✓✗
H2 ✓✗
H3 ✓✗
K4 ✗✓
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