Codan-radio MT-4E Analog and P25 Digital - User Guide Manual de usuario descargar pdf (Pagina 49)

MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | USER GUIDE

Chapter 6: Radio System Components Page 41

Channel and Bank Selection

The MT-4E radio modules are capable of 16 channel operation in 2 banks (32 channels total). The 16

channels are controlled via four CSEL signal lines connected to each receiver and transmitter module.

The CSEL signal lines are set as either a 0 (0 Vdc) or a 1 (+9.5 Vdc). Table 6-1 shows the channel

selected for the CSEL input settings.

Table 6-1: Channel Selection Settings

Channel Decimal CSEL3 CSEL2 CSEL1 CSEL0

100000

210001

320010

430011

540100

650101

760110

870111

981000

1091001

11101010

12111011

13 12 1 1 0 0

14 13 1 1 0 1

15 14 1 1 1 0

16 15 1 1 1 1

The Receiver and Transmitter Bank A/B select lines are set as either a B (0 Vdc) or an A (+9.5 Vdc).

The logic for the Bank A/B select lines is different from the CSEL signal lines. If the Bank A/B select line

is pulled high (+9.5 Vdc), or left ﬂ oating, Bank A is selected. If the Bank A/B select line is pulled low (0

Vdc), Bank B is selected.

There are 3 different ways to change the channel and bank of a transmitter / receiver module:

1 The user can set jumpers mounted on the motherboard for each Channel Select signal line

(set of four for each Tx / Rx module) and Bank A/B select line. These jumpers can be used to

permanently set a subrack slot at a speciﬁ c channel and bank.

• Jumpers can be set for 0 (0 Vdc) “down” or 1 (+9.5 Vdc) “up”.

• Pull-up resistor jumpers to +9.5 Vdc must be installed.

2 CSEL signal lines and Bank A/B select lines can be controlled externally by a tone remote

adapter, a CI-RC-4M-G2 multiple link controller, or other third party devices.

3 Sixteen-position rotary select switches mounted on the CI-BC-4E base controller can control the

CSEL lines and toggle switches can control the Bank A/B select line. Optionally the CI-RC-4L

repeater controller can have a rotary switch added for control of the CSEL signal lines.

The pull-up resistor jumpers to +9.5 Vdc must be removed and all channel select and bank select

jumpers must be installed in the 1 or “up” position for both external control and rotary switch control of

channel selection. The locations of the channel select and pull-up jumpers are shown in Figure 6-3.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 57 58

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Codan-radio MT-4E Analog and P25 Digital - User Guide Manual de usuario Pagina 49

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