FunkTronic FT 634a, FT 634aC, FT 634aCL User Manual

Line Interface

FT 634a, FT 634aC, FT 634aCL

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These instruction are valid from serial number: 3001/06 PCB Nr.: FT634a2

Content

Seite

Technical Data 2
General Features 3
Channel Switching 4
Option Line Monitoring 4
Transmitter Control 4
Functions of the LEDs 4
Examples 5
Jumper 7
Block Diagram FT634a (C, CL) 8
Block Diagram DSP 9
Pinout 10
Connecting Cable RS232 12
Service Program/Adjustment 12
Programming 14
Tone Chart 16
General Safety Instructions 17
Factory Returning of old equipment 17
Terms and Abbreviations 18

Technical Data

Voltage of operation +12V DC -30% +40%
Current demand ca. 200 mA
Fuse 1 A, self-resetting
Weight ca. 525 g
Dimensions W x H x D 104 x 44 x 175 mm
Frequency of pilot tone 3300 Hz
Pilot tone decoder +/- 0,8 % (+/- 26 Hz)
Response time < 20 ms
Release time < 40 ms
min. pilot tone level at measuring (monitor.)point 75 mV
Notchfilter pilot tone suppression > 50 dB

2- resp. 4-wire

Input level 2-wire -1,4 dBm nominally, 658 mV
Adjustment range 2-wire -23 dBm to +3 dBm, 55 mV to 1 V
Input level 4-wire -3,5 dBm nominally, 518 mV
Adjustment range 4-wire -25 dBm to +1 dBm, 44 mV to 869 mV
Input impedance 2-wire Zr or 600 Ohm, 4-wire 600 Ohm
Output level 2/4-wire -4,5 dBm, 461 mV at 600 Ohm (max. without limit)
Output level range 2/4-wire, 600 Ohm -30 dBm to -2 dBm, 25 mV to 615 mV
Output level range 2/4-wire, 200 Ohm -36 dBm to 8,5 dBm, 12 mV to 291 mV
Output impedance 2-wire Zr or 600 Ohm
Output impedance 4-wire 600 Ohm

Interface radio device resp. desk top control

Input level + 3 dBm nominally
Adjustment range - 24 to + 6 dBm
Input impedance 600 Ohm
Output level - 17 dBm ex factory setting
Adjustment range - 30 to + 5 dBm
Output impedance 600 Ohm

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General Features

The new line interface FT634a is completely constructed in SMD-technology. The connections are
pin-compatible with the former version, but instead of male connectors there are female connectors.
The line interface is used to remotely operate a two-way radio by a 2- or 4-wire connection. It is
possible to bridge very long distances depending on the cable attenuation. The FT634a is the simplest
and most reasonable version. There are 6 different versions of the line interface FT634a. All versions
offer the following features:

All versions of the FT634a

- 2- or 4-wire connection (selectable by jumper)

- Impedance 600 Ohm or Zr (selectabel by jumper) (Zr only for 2-wire)

- Connector radio device --> AF-in/output and PTT-out

- Pilot tone decoder 3300 Hz or DC-decoder

- Serial interface RS232 to adjust and program

- All levels adjustable with RS232

- All AF-in/outputs galvanically separated (transformer)

Version FT634aC

The version FT634aC additionally offers the possibility to switch channels remotely. The information
for switching channels remotely are transmitted by 5-tone. A pilot tone encoder for 3300 Hz and a DC­encoder are also included. These are needed to connect the line interface to an operation terminal
(e.g Major 6). The FT634aC has 8 digital inputs and 8 digital outputs.

Version FT634aCL

The version FT634aCL additionally offers line monitoring. This means that the connection of the 2/4­wire line is constantly monitored.

The versions FT634a, FT634aC and FT634aCL are available in two different housings.

- black flange aluminum housing

- 19 inch plug-in unit

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Channel switching

Remote switching of channels is achieved by transmitting certain 5-tone sequences. The interface to
the two-way radio device is parallel. The channel switching status output can be "binary", "binary-1",
"decimal" and "2xBCD". The channel output can be inverted if necessary.

Option line monitoring

The operating mode line monitoring can be configured for the FT634aCL. To do this devices with
this option are needed at both ends of the line. Line monitoring is only active during idle times of the
wire.

For this one of the devices has to be configured as master, the other as slave. The master device then
scans the slave device in certain intervals. If there is no reply or the slave-device doesn´t receive a
scan by the master-device within a certain interval, one of the switching outputs can be programmed
as error indicator.

Transmitter control

The transmitter control is activated as soon as the AC-line receives and decodes the pilot tone. Then
the PTT-output is switched by a potential-free relay. The PTT-output can also be controlled by DC- or
AF-decoding (register 053/1).

Functions of the LEDs

The green LED is on when the pilot tone is decoded by the AC-line or a DC potential is applied or
AF is decoded depending on the configuration. The green LED blinks when there is a decoding but
the switching of the transmitter relay is suppressed.

The yellowlbe LED is on when the pilot tone was activated or DC applied to the line or the AF
connected to the line. The yellow LED blinks when the activation of one of the afore-mentioned
functions is suppressed.

LED yellow

- Pilot tone turned on or

- DC applied and

- AF connected to the line
(blinking see description)

LED green transmitter relay on

because

- Pilot tone was decoded or

- DC was decoded or

- AF was decoded
(blinking see description)

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Examples

Depending on the setup of the radio installation different versions of the FT634a can be used. The
following questions should be answered when planning:

- Interface connection of the FT634a to an operation terminal or a two-way radio set

- Remote channel switching necessary

- Line monitoring necessary

- 2- or 4-wire connection, simplex or duplex

- Remote station also FT634a or operation terminal

Example 1: 2- or 4-wire remote control via private lines

Major 4a or 5a

AC- or DC- remote control

2 or 4

FT634aC (with channel switching) or
FT634a (without channel switching)

Example 2: Parallel circuit of several operation terminals --> LIM AC has to be equipped with notch
for pilot tone.

Major 5a

On private lines the remote control can be carried out by DC.

Here the two LIM AC and the notch lters for the pilot tone are not

needed.

2

LIM AC

2

Major 4a

FT624

2

LIM AC

Example 3: 2- or 4-wire remote control via leased lines.

Major 4a, 5a or 6

2 oder 4

LIM AC (only 2-wire)
FT634aC

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FT634aC (with channel switching) or
FT634a (without channel switching)

FT634aC (with channel switching) or
FT634a (without channel switching)
FT634aCL (with line monitoring)

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Example 4: Operation terminal Major 6 via 2-wire to the multi-channel radio set (with option line
monitoring)

Major 6, 4a or 5a

2

FT634aCL
(with line monitoring)

FT634aCL
(with line monitoring)

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