11-24-0000 SYNTHESIZED DATA TRANSMITTER
Issue 1124UA
11-24-0000 SYNTHESIZED DATA TRANSMITTER
Issue 1124UA
Sea Air and Land Communications Ltd
Page 3
Sea Air and Land Communications Ltd
Page 4
11-24 SYNTHESIZED UHF TRANSMITTER
OPERATOR’S MANUAL
1.0
DESCRIPTION:
The Salcom 11-24 is a 1.5w UHF narrow band FM Transmitter using
±5kHz deviation on the UHF 25kHz channel spacing Bands, 406-430 MHz & 450-
Pin 2,4,10
Channel change -see chart.
475MHz and is the companion transmitter to the 11-23 UHF FM Synthesized Receiver.
The 11-24 is supplied tuned to the requested frequency. A two pin power connector and
a 15 pin `D' range plug and cover are provided standard with the transmitter. A power
supply and a range of aerials are available. Discuss this with your supplier.
2.0
OPTIONS:
Special options are available and can be ordered with the 11-24 or retro-
fitted by your supplier:-
!
600O balanced input when T1 fitted.
!
Transmitter output power adjustable 50mW - 1.5W
!
Multi-channels available, talk with your supplier.
!
Frequency control via I²C or RS232 input is possible utilizing an external
processor on other equipment.
3.0
SETUP INSTRUCTIONS
3.1
Deviation on data source:
When transmitting a constant level tone from a
modem or tone encoder use TX1 input (Comms connector pin3) and set the line
level to ±4kHz deviation with the modulating source (i.e. modem idle tone) with
RV4.
3.2
Deviation on speech source:
If an uncompressed varying level modulation (i.e.
speech) is being transmitted, then the TX2 input (Comms connector pin9) can
be used. Set RV3 for ±3kHz deviation when transmitting lowest input level.
Important: The 11-24 adjustments have been factory set to ensure that it will comply
with specified emission standards and controls other than RV3 & RV4 should not be
touched.
4.0
INSTALLATION:
A screwdriver to connect the power socket, and a soldering iron to
connect the D15 communications plug and the aerial, are required for the installation
procedure.
4.1
Connections
Aerial Socket
Connects to a BNC plug, 50 ohm coax and half-wave dipole or yagi
aerial.
Power Plug
Connects to + and -13.5V. The positive connection is nearer to the D15
P2
Communication Socket.
Comms
Socket S1
Pin 1
Earth connection.
Pin 3
TX1 input, 10KO unbal. level adjustable via RV4.
Pin 5
PTT. Earth to initiate a transmission.
Pin 6
Transmit Data. RS232 format, 0-5v logic
Pin 7
External Power Control.
Pin 8,15
+Ve available for auxilliary cct.
Pin 9
TX2 Input. 10KO unbal. 5mV - 5V, deviation adjustable
Pin 11,12
600 ohm balanced input when T1 fitted, level adjustable
Pin 13
No connection
Pin 14
Receive Data. RS232 format, 0-5v logic
via RV3.
via RV3 or RV4. Link JU1 to select Tx1 or Tx2 input.
5.0
OUTPUT:
The transmitter can be operated continuously provided that the supply voltage
is limited to 13.5 volts.
It is critical that the aerial is OK and the VSWR is below 2.0.
6.0
OPERATING REQUIREMENTS:
!
Supply voltage: +13.5V (12V nominal)
!
Operating temperature range: -10
E
C to +60
E
C
!
Mount in a dry position away from loud noise or vibration
7.0
LED INDICATORS:
Two indicator LED's are visible on the top of the case.
(1)
Green Power LED shows power is present at the 11-24.
(2)
Red Tx LED lights when the 11-24 is transmitting.
8.0
REPROGRAMMING
The 11-24 can be re-programmed by a supplier with the
appropriate programming facilities to another frequency in the same band.
9.0
MOUNTING:
Mount the case using the two holes provided in the lid and clip the 11-24
into position on the lid. Secure with the two self tappers to make positive electrical contact
between the case and lid and prevent RF recirculation.