MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
IM08-MT-4E-TXRX-P1162
General Information
3
CHannEl and Bank SElECtIon
Four channel select lines, CSEL 0 – CSEL 3, from the motherboard are brought into the receiver and
transmitter modules by the 48-pin rear connector, allowing selection of 16 different channels. These
signals are normally pulled low in the receiver and transmitter, but are typically set by jumpers on
the motherboard to select Channel 1 by default. In addition, a bank select input is provided to switch
between Bank A and B, each of which has 16 channels. The Bank select line normally floats high
(+5 V), selecting Bank A, but may be pulled low or high externally to select Bank B.
Channel and Bank Select line Mapping
The table below shows the relationship between the states of the bank and channel select lines. Note
that the channel select lines follow a binary pattern, but that the binary “0” represents Channel 1.
The Bank A/B select line normally floats high (+5 V), selecting Bank A, but may be pulled low or high
externally via the Bank A/B select line.
BANK A/B
CSEL 3
CSEL 2
CSEL 1
CSEL 0
BANK
SELECTED
CHANNEL
SELECTED
HI
LO
LO
LO
LO
A
1
HI
LO
LO
LO
HI
A
2
HI
LO
LO
HI
LO
A
3
HI
LO
LO
HI
HI
A
4
HI
LO
HI
LO
LO
A
5
HI
LO
HI
LO
HI
A
6
HI
LO
HI
HI
LO
A
7
HI
LO
HI
HI
HI
A
8
HI
HI
LO
LO
LO
A
9
HI
HI
LO
LO
HI
A
10
HI
HI
LO
HI
LO
A
11
HI
HI
LO
HI
HI
A
12
HI
HI
HI
LO
LO
A
13
HI
HI
HI
LO
HI
A
14
HI
HI
HI
HI
LO
A
15
HI
HI
HI
HI
HI
A
16
LO
LO
LO
LO
LO
B
1
LO
LO
LO
LO
HI
B
2
LO
LO
LO
HI
LO
B
3
LO
LO
LO
HI
HI
B
4
LO
LO
HI
LO
LO
B
5
LO
LO
HI
LO
HI
B
6
LO
LO
HI
HI
LO
B
7
LO
LO
HI
HI
HI
B
8
LO
HI
LO
LO
LO
B
9
LO
HI
LO
LO
HI
B
10
LO
HI
LO
HI
LO
B
11
LO
HI
LO
HI
HI
B
12
LO
HI
HI
LO
LO
B
13
LO
HI
HI
LO
HI
B
14
LO
HI
HI
HI
LO
B
15
LO
HI
HI
HI
HI
B
16