14 Introduction TP9100 Service Manual© Tait Electronics Limited May 20051.1 KeypadsThe radios are available with the following keypads:■ TP9160 with 16-button keypad (two scroll and two selection keys and10 alphanumeric keys)■ TP9155 with 4-button keypad (two scroll and two selection keys)The keypads are implemented by different front panels and keypads.The rest of the radio hardware is identical.1.2 Frequency BandsThe radios are available in the following frequency bands:■ 136 to 174MHz (B1)■ 400 to 470MHz (H5)■ 450 to 530MHz (H6)The frequency bands are implemented by different main boards.1.3 AccessoriesTait offers a large variety of audio accessories, antennas, a single batterycharger, batteries, and other accessories such as carry cases.For more information on the serviceable accessories refer to Chapter 3Accessories on page 295 of this service manual.Audio Accessories The radios allow for the connection of a comprehensive range of audioaccessories:■ “Evolution” speaker microphone■ light duty headset with boom microphone (behind the head)■ heavy duty headset with noise-canceling boom microphone (over thehead)■ three wire headset with mini-lapel microphone■ accessory connector kit■ third-party audio accessories as approved on a per-CSO basisAntennas The radios allow for the connection of helical and whip antennas. For anoverview of the antennas available, refer to “Antenna Identification Chart”on page 297.