Daviscomms 11-54-0000 User manual

Copyright © 2017 Sea Air and Land Communications Ltd. All rights reserved.
11-5 -0000
25 Watt VHF
Power Amplifier
PRODUCT MANUAL
Version 1.01
October 2017
Salcom Product Documentation

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11-5 -0000 25 WATT VHF POWER AMPLIFIER Product Manual
Daviscomms UK Ltd, Unit 30, Chancerygate Business Centre, 52 Goulds Close, Milton Keynes - MK1 1EQ, U.K. November 2017
This document is designed to familiarise you with Salcom products and guide you through the
hardware, configuration, installation and overall system management.
Salcom is an environmentally conscious company and in an effort to conserve paper no longer
prints manuals with shipped products. All relevant documentation can be downloaded in PDF
form from our distribution partner website www.daviscommsuk.com.

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11-5 -0000 25 WATT VHF POWER AMPLIFIER Product Manual
Daviscomms UK Ltd, Unit 30, Chancerygate Business Centre, 52 Goulds Close, Milton Keynes - MK1 1EQ, U.K. November 2017
Warranty and Disclaimer
Salcom products are warranted for a period of 12 months from the date of purchase against
faulty materials and workmanship. Should any fault occur the unit should be returned to the
vendor, freight pre-paid. Please include a description of the fault to assist with prompt return.
Any unauthorised alterations or repairs will invalidate the warranty.
All information provided in this document is carefully prepared and offered in good faith as a
guide in the installation, use and servicing of Salcom products. Installers must ensure that the
final installation operates satisfactorily within the relevant regulatory requirements. Salcom
accept no responsibility for incorrect installation. We reserve the right to change products,
specifications and installation data at any time without notice

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11-5 -0000 25 WATT VHF POWER AMPLIFIER Product Manual
Daviscomms UK Ltd, Unit 30, Chancerygate Business Centre, 52 Goulds Close, Milton Keynes - MK1 1EQ, U.K. November 2017
Product Overview
The 11-5 power amplifier operates over the frequency range 138-162MHz and with -5 watts
input it will deliver 25 Watts. It has a switching bandwidth of ±5MHz with 20 Watts minimum
output.
The power sense operates with a minimum of 3 watts input and switches both the power and
aerial relays. The 11-5 will operate satisfactorily with down to 00mW drive but the PTT
connection must be grounded to operate the receive to transmit changeover.
A 2dB 50S input matching pad allows for connection to a wide range of driving devices and
mis-tuning without the risk of instability.
In the receive mode it will pass a receive signal with less than 1dB attenuation.
The 3 stage aerial filter attenuates all spurious emissions to less than -30dBm.
The 11-5 is protected against accidental power connection reversal.
The green Power LED operates at all times with power connected and the red Transmit LED
operates only when the 11-5 is switched to the transmit mode (PTT activated).

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11-5 -0000 25 WATT VHF POWER AMPLIFIER Product Manual
Daviscomms UK Ltd, Unit 30, Chancerygate Business Centre, 52 Goulds Close, Milton Keynes - MK1 1EQ, U.K. November 2017
Tuning, Installation and Connections
1. Connect +13.5V supply to the 11-5 but leave the PTT connection unconnected.
2. Connect the 11-5 input to a W driving device and the output to a power meter or
aerial.
3. With Watts input drive, tune CV1 and CV2 for maximum output using a plastic, metal
tipped flat bladed screwdriver.
. Alternatively, with 00mW minimum input drive, ground the PTT connection and tune
CV1 & CV2 for maximum output to give 10 Watts typical output. The PTT connection can
sometimes be connected straight to the driving device PTT but a steering diode may be
needed in series with the driver PTT if it returns to a voltage lower than +13.5V.
5. Tuning can be effected through the two holes in the top of the case by removing the
plastic plugs.

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11-5 -0000 25 WATT VHF POWER AMPLIFIER Product Manual
Daviscomms UK Ltd, Unit 30, Chancerygate Business Centre, 52 Goulds Close, Milton Keynes - MK1 1EQ, U.K. November 2017
Technical Specification
Power Supply 13.5 V
RF Frequency VHF: 138-162MHz
Output Power 25 Watt typical, -5 Watt input
Power Requirement amps typical, 5 amps max @ 25W output
Standby, mA (Power LED current)
Transmit Duty Cycle 50% at 25 Watt power output
Stability 2dB 50S input pad.
Relay switches supply current on PTT command
Receiver Switching Option:-
Power Input 3 Watts minimum
Switching Bandwidth ±5MHz, 20 Watts minimum with Watts input
Transmit Enable Power sense circuit operates relay -3 Watts min
Power Amplifier Only Option:-
Power Input 0. Watts min. for 10Watt output typical
Switching Bandwidth ±5MHz, 20 Watts minimum with Watts input
Transmit Enable Ground PTT, 3mA source
Spurious Outputs -30dBm max
Aerial Connection BNC for Input and Output
Power Connector 2 way plug & socket, screw connections (supplied)
PTT Connector 2 way plug & socket, screw connections (supplied)
Enclosure 1 0 x 105 x 33mm
Weight 500gms. 600gms maximum including box

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11-5 -0000 25 WATT VHF POWER AMPLIFIER Product Manual
Daviscomms UK Ltd, Unit 30, Chancerygate Business Centre, 52 Goulds Close, Milton Keynes - MK1 1EQ, U.K. November 2017
How to Contact s
Daviscomms K Ltd
Unit 30, Chancerygate Business Centre
52 Goulds Close, Denbigh Road (West)
Milton Keynes - MK1 1EQ
Unite Kingdon
T: + (0)1908 36 7722
W: www.daviscommsuk.com
E: sales@ daviscommsuk.com