11-22-0000
SYNTHESIZED VHF
TRANSMITTER
OPERATOR’S
MANUAL
Sea Air and Land Communications Ltd, PO Box 22-621, 120 St Asaph Street, Christchurch, New Zealand
11-22-0000 SYNTHESIZED VHF TRANSMITTER OPERATOR’S MANUAL Issue 0198 11-22-0000 SYNTHESIZED VHF TRANSMITTER OPERATOR’S MANUAL Issue 0198
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11-22 SYNTHESIZED VHF TRANSMITTER
OPERATOR’S MANUAL
1.0 DESCRIPTION: The Salcom 11-22 is a 4w VHF narrow band FM Transmitter using
±5kHz deviation on the VHF 25kHz channel spacing Bands, 148-165MHz and ±2.5kHz
deviation on the 12.5kHz channel spacing Bands, 138-156MHz and is the companion
transmitter to the 11-21 VHF FM Synthesized Receiver.
The 11-22 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 11-22 or retro-
fitted by your supplier:-
! 600O balanced input when T1 fitted.
! Transmitter output power adjustable 50mW - 4W
! 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 11-22 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 the aerial (½ wave dipole or yagi) via a BNC plug and 50O coaxial cable.
POWER PLUG
Connects to +12V supply and ground. The polarity is marked on the 11-22 case
COMMUNICATIONS SOCKET
Pin 1
Pin 10
Earth connections.
Pin 2
Pin 4 No connections.
Pin 13
Pin 3 Tx Audio1 input, 10KO unbalanced, adjustable via RV4 (TX1 sens).
Pin 5 PTT. Earth to initiate a transmission.
Pin 6 Transmit Data input RS232 format, 0-5V logic.
Pin 7 High/Low power control. (Contact Salcom for application)
Pin 8
Pin 15
+13.5V supply.
Pin 9
TX2 Input. 10KO unbal. 5mV - 5V, sensitivity adjustable via RV3 (TX2
Sens).
Pin 11 600O balanced input when T1 fitted, Link JU1 to select Tx1 or Tx2
Pin 12 amplifier.Sensitivity adjustable via RV3 (TX2 sens) or RV4 (TX1 sens).
Pin 14 Receive data. RS23 format, 0-5V logic.
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. Steps
must be taken to conduct heat from Q11 heatsink or from the case adjacent to Q11 heatsink
mounting.
6.0 OPERATING REQUIREMENTS:
! Supply voltage: +13.5V (12V nominal)
! Operating temperature range: -10EC to +60EC
! 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 11-22.
(2) Red Tx LED lights when the 11-22 is transmitting.
8.0 REPROGRAMMING The 11-22 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 11-22 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.
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