TN110 Channel and Frequency Selection
MT-3/4 Radio Systems
TECHNICAL NOTES
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MT-4E Channel and Bank Selection
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 1 shows the channel selected for the CSEL
input settings.
Table 1: Channel Selection Settings
Channel Decimal CSEL3 CSEL2 CSEL1 CSEL0
100000
210001
320010
430011
540100
650101
760110
870111
981000
1091001
11101010
12111011
13121100
14131101
15141110
16151111
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 diff erent 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.
On older motherboards (Serial # 123125 and earlier), the Receiver Bank A/B select line uses the same line as the
MT-3 Receiver ISO COR K and the Transmitter Bank A/B select line uses the same line as the MT-3 Transmitter
Standby. No jumpers are available for the Bank select.
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