User's Manual

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Technical Manual Options

3.3 T03 Programmable DCS/CTCSS

encoder/decoder

3.3.1 Description

Provision is made in the MX800 to fit a full duplex DCS encoder/decoder.

There are 83 digital codes available. Any standard DCS code or CTCSS tone

may be assigned to any of the transmit or receive channels through the

Channel screen in MXTOOLS. Multiple CTCSS tones are programmable for

any channel providing "Community Repeater" functionality.

The DCS encoding function provides continuous, repetitive digital word

modulation to the transmitter. The decode function controls receiver muting

to eliminate all calls that are not coded with the assigned DCS code.

This option may be fitted at order placement or retro fitted subsequently. The

DCS PCB assembly is fitted in place of IC25 (MX805AP). Once the DCS

option is fitted the "DCS option fitted" check box is ticked in the MXTOOLS

Configuration screen and the encode and decode codes are programmed

through the Channel Edit screen.

Figure 3-2MX800 DCS Option T03

Refer circuit diagram CS001-4

3.3.2 Installation

Components Required:

1. DCS daughter board, complete with MX805AP IC’s. Qty-1

2. 3x8mm standoff post. Qty-1

Method:

1. Remove the cover to the MX800 radio.

2. Locate the socket for IC25, if necessary remove the IC from the socket.

3. Remove the 3x5mm screw that is located on the left hand edge and

toward the front of the Motherboard from IC25 socket. Do not discard

this screw.

4. Install the 3x8mm standoff post into the motherboard-mounting hole. Do

not over-tighten this standoff.