Channel and bank selection, Table 6-1: channel selection settings – Codan Radio MT-4E Analog and P25 Digital - User Guide User Manual
Page 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
1
0
0
0
0
0
2
1
0
0
0
1
3
2
0
0
1
0
4
3
0
0
1
1
5
4
0
1
0
0
6
5
0
1
0
1
7
6
0
1
1
0
8
7
0
1
1
1
9
8
1
0
0
0
10
9
1
0
0
1
11
10
1
0
1
0
12
11
1
0
1
1
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.