Eddystone Broadcast S7600 Series Owner's manual

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Eddystone Broadcast
----
S7600 Series
S7604 –S7605C
4kW –5kW
Medium Power
FM Transmitters
----
Installation
and
Operation
----
Issue 3a
S7604-00MA-03a
February 2023
----
Eddystone Broadcast Ltd.
26, Arden Rd.
Arden Forest Industrial Estate
Alcester, Warwickshire
B49 6EP, England
Tel. [phone]
Fax. [phone]
www.eddystone-broadcast.com

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Index
SECTION ONE : INTRODUCTION
1.1 : GENERAL DESCRIPTION………………………………………………………………… Page 5
1.1.1 E2021 300W Amplifier Module…….……………………………………………………… Page 5
1.1.2 E2088/E2322 Power Supply Module (single phase variants)…….……………………. Page 6
1.1.3 E2088/E2322 Power Supply Module (three phase variants)……………………..……. Page 6
1.1.4 E2023 Transmitter Controller Unit…………………………..……………………………. Page 7
1.1.5 E2026 Drive Changeover/Output Monitor Unit………………...………………………… Page 7
1.1.6 E2028 16 Way Combiner Unit…………………………………………………………….. Page 8
1.2 : VARIANTS AND OPTIONS………………………………………………………………… Page 9
1.3 : TECHNICAL SPECIFICATIONS…………………………………………………………… Page 10
SECTION TWO : INSTALLATION
2.1 : PHYSICAL DIMENSIONS AND FITTING………………………………………………… Page 13
2.1.1 Installation Items …………………………………………………………………………….Page 13
2.1.2 Rack Mounting………………………………………………………………………………. Page 15
2.2 : EXTERNAL CONECTIONS…………………………………………………………….….. Page 16
2.2.1 Mains Supply Connectors (single phase S7604-01 and S7605-05)………………….. Page 16
2.2.2 Mains Supply Connector (three phase S7604-02 and S7605-07)…………………….. Page 17
2.2.3 RF Output Antenna Connector……………………………………………………………..Page 18
2.2.4 RF Input Exciter/Drive(s) Connectors…………………………………………………….. Page 18
2.2.5 Safety Interlock Connector………………………………………………………………….Page 18
2.2.6 RF Output Monitor Connector……………………………………………………………... Page 18
2.2.7 Drive A/B Monitor and Control Connectors ………………...…………………………….Page 18
2.2.8 Parallel (E2023-01/02) or RS232 Serial Remote Control DTE Con. (E2023-03/04)… Page 19
2.2.9 Second Transmitter Remote Control Connector………………………………………… Page 20
2.2.10 Mains Supply Output Connectors…………………………..……………..…………….. Page 20
2.2.11 RS232 Serial Control and Monitor (COM) Connector ……………………………..…. Page 21
2.2.12 TCP/IP Control and Monitor Connector (/T option only)…………………...…………. Page 21
2.2.13 FWD/REV Output (Analogue Monitor) Connectors………………………….………… Page 21
2.3 : SETTING UP PROCEDURES…………………………………………………………….. Page 22
2.3.1 Fuses…………………………………………………………………………………………. Page 22
2.3.2 Output Power Level and Frequency Adjustment………………………………………… Page 23
2.3.3 Reverse Power Trip Level Adjustment…………………………………………………….Page 24
2.3.4 Serial Remote Control Baud Rate Setting……………………………….…………….… Page 25
2.4 : SERIAL REMOTE CONTROL AND MONITORING…………………….……………….. Page 26
2.4.1 Introduction……………………………………………………………………….…………. Page 26
2.4.2 Control Commands and Status Monitor Requests……………………………………… Page 26
2.4.3 Reverted Status Monitor Information………………………………………………………Page 28

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SECTION THREE : OPERATION
3.1 : CONTROLS AND DISPLAYS…………………..…………………………………..……… Page 31
3.1.1 E2021 Amplifier Module……………………………………………………………………. Page 31
3.1.2 E2088 Power Supply Module……….………..………………………………..………….. Page 31
3.1.3 E2322 Power Supply Module……………………………………………………………... Page 31
3.1.4 E2023 Transmitter Controller Unit…………………………………………..…………….. Page 32
3.1.5 E2026 Drive Changeover/Output Monitor Unit…………………..…………………….… Page 33
3.1.6 Supply Disconnector…………………..……………………………………………………. Page 33
3.2 : MANUAL CONTROL……………………………………………………………………….. Page 34
3.3 : MANUAL MONITORING…………………………………………………………………... Page 34
3.4 : AUTOMATIC CONTROL………………………………………………………………….. Page 35
3.4.1 Exciter/Drive Control and Monitoring…………………………………………………….. Page 35
3.4.2 Muting and Reduced Power Operation…………………………………………………… Page 35
Bound at Rear
Front and Rear Panel Views……………………………………………………………. S7604-00GA
Block Diagram……………………………………………………………………………. S7604-00BK
Interconnections Circuit Diagram …………………………………………………….... S7604-00CT

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SECTION ONE : INTRODUCTION
! CAUTION !
These Transmitters operate at high RF power levels, internal supply energy levels and mains
supply current levels. They also incorporate devices containing toxic BeO. Installation, operation
and maintenance of this unit must therefore, only be carried out by suitably qualified personnel,
familiar with and fully utilising the safety procedures such equipment demands.
NO attempt at installation should be made without full reference to and compliance with SECTION
TWO : INSTALLATION.
NO attempt at internal maintenance should be made without full reference to and compliance with the
appropriate sections (fuse changing which is detailed in INSTALLATION).
1.1 : GENERAL DESCRIPTION
The S7604 Medium Power FM Transmitter provides output powers of up to and including 4kW, or 8kW
using combined pairs, in the standard Band ll frequency range of 87.5-108MHz.The S7605C
‘Compact’ Medium Power FM Transmitter provides increased output powers of up to and including
5kW, or 10kW using combined pairs. They are normally supplied with either one or two Exciters,
capable of generating a standard mono or stereo FM signal from a variety of analogue or digital audio
or data sources (including left/right audio, MPX, RDS, SCA, DARC etc.). It is important to note that the
Exciter(s) supplied will depend on the user’s actual requirements in this regard which, therefore, must
be clearly specified at time of ordering.
The Transmitters are totally self-contained (including forced air-cooling) and can be mounted as a
complete unit (less Exciters) within a standard 19 inch rack with at least 600mm depth and 26U height.
All that is required is a connection to a mains supply (single or three-phase depending on variant
supplied) to an antenna and to the Exciter/Drive(s). When used in pairs, to generate up to 8kW or
10kW, an additional two-way splitter, combiner and approximately 2kW or 2.5kW balance load is also
required. In this situation, additional manual ‘patching’ or manual/automatic switching can be provided,
as an option, to direct all of one Transmitter’s power to the antenna.
The key feature of The S7600 series is its’ ability to remain ‘on-air’. The use of multiple Amplifier and
Power Supplies Modules and dual power supply and control circuitry means that if failures do occur, it
normally only results in a reduction of output power. Furthermore, the lightweight, hot-pluggable
Amplifier and Power Supply Modules can be easily replaced, in seconds, without having to go ‘off-air’.
Provision for dual Exciter/Drive automatic changeover and for connection to a second active/passive
reserve S76XX or S79XX (i.e. 500W to 10kW) Transmitter is also made, further enhancing the ability
to remain ‘on-air’.
Each Transmitter consists of a number of modules described as follows (1.1.1 –6 inc.). Front and rear
views, block and circuit diagrams, showing these modules are bound at the rear of this manual
(S7604-00GA, S7604-00BK and S7604-00CT).
Workshop editions of this manual contain extra information, also bound at the rear, which gives
detailed test procedures, full size circuit diagrams, assembly diagrams, layouts and parts lists
1.1.1 : E2021 300W Amplifier Module
Sixteen of these are provided, each with their own independent control and monitoring circuitry. This
circuitry includes reverse power, supply current and temperature monitoring to shut down and protect
individual modules. Failures in a single Amplifier Module only tend to give a slight reduction in power,
with the Transmitter still operating with several modules having failed.
Each Amplifier Module can be removed or replaced whilst the Transmitter is operating (‘hot-
pluggable’). This feature means that if failures do occur, modules can be replaced within seconds,
without having to go ‘off-air’. Red/green fault displays on the front of each module help indicate the
faulty module to be replaced, this normally restoring the Transmitter’s full output without any further

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immediate technical investigation being required. The relatively low weight and small size of each
module assist their actual transport to site.
Each Amplifier also has its own front panel ‘mute’ switch which is mechanically interlocked so that it
has to be operated before the module can be removed. All other signal, 50V dc supply and control
connectors are at the rear of the unit. The control connectors go to one of two independent internal
Transmitter control buses.
Each control bus has its own RS485 data bus which is used to carry the monitored serial information
from the amplifier to the E2023 Controller. Each bus also has its own power level control line, derived
from the E2026 Drive Changeover/Output Monitor, to set the power level of each amplifier module and
thus the final transmitter output power.
Various versions of the 300W Amplifier Module may be supplied. These versions have slightly
different internal circuitry. They are however interchangeable, but to maximise output power, all
modules should ideally be of the same version.
1.1.2 : E2088/E2322 Power Supply Module (single phase variants)
Any given Transmitter can only accept either E2088 or E2322 modules, not both
Eight of these are provided (twelve on the /P option) with two independent mains supply connectors to
enable operation from dual, single phase, mains supplies. The modules are equally grouped into four
supplies ‘A’, ‘B’, ‘C’, and ‘D’. The two (three on the /P option) E2088/E2322 modules in each group are
current OR’d together. Thus, on the /P option, where the extra third module is fitted, the current lost
when any single module in the group fails, can still be supplied by the remaining two modules in the
group.
The ‘A’ supply provides a supply bus to the four E2021 Amplifier Modules on the bottom right hand ‘A’
side of the transmitter. The ‘B’ supply provides a separate bus to the four Amplifier Modules on the
bottom left hand ‘B’ side. Single units requiring power (E2023 and E2026) and all cooling fans are
supplied from both supply buses.
The ‘C’ supply provides a supply bus to the four E2021 Amplifier Modules on the top right hand ‘A’
side of the transmitter and the ‘D’ supply provides a supply bus to the four E2021 Amplifier Modules
on the top left hand ‘B’ side of the transmitter.
All supplies are switched via a single front panel safety switch and associated relays. The switch can
be padlocked in the ‘off’ position to ensure that the Transmitter remains off whilst work is being carried
out at the antenna etc.
Each E2088/E2322 Power Supply Module has its own forced air cooling, output control and monitoring
circuitry and generates a regulated 50V to 53V dc supply. As with the Amplifier Modules, each
E2088/E2322 Power Supply module can be removed or replaced, within seconds, whilst the
Transmitter is operating (as long as either the ‘A’ or ‘B’ supply has two E2088/E2322 modules
remaining). Red/green fault displays, low module weight and small size again feature.
50-53Vdc outputs for each Amplifier, for all the low power single units and mains supplies for each
Exciter are provided via separate fuses at the rear of the Transmitter. The Power Supply monitor
connectors go to one of two independent internal Transmitter control buses and hence to the E2023
Controller.
1.1.3 : E2088/E2322 Power Supply Module (three phase variants)
Any given Transmitter can only accept either E2088 or E2322 modules, not both
Nine of these are always provided with a single three-phase mains supply connector. The modules are
equally grouped into three supplies ‘A’, ‘B’ and ‘C’. The three E2088/E2322 modules in each group are
current OR’d together.
The ‘A’ supply provides a supply bus to the four E2021 Amplifier Modules on the bottom right hand ‘A’
side of the transmitter and to the top right outer amplifier. The ‘B’ supply provides a separate bus to

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the four Amplifier Modules on the bottom left hand ‘B’ side and to the top left outer amplifier. Single
units requiring power (E2023 and E2026) and all cooling fans are supplied from both supply buses.
The ‘C’ supply provides a supply bus to the two central E2021 Amplifier Modules on the top row and
all four E2021 Amplifier Modules on the row below.
All supplies are switched via a single front panel safety switch. The switch can be padlocked in the ‘off’
position to ensure that the Transmitter remains off whilst work is being carried out at the antenna etc.
Each E2088/E2322 Power Supply Module has its own forced air cooling, output control and monitoring
circuitry and generates a regulated 50V to 53V dc supply. As with the Amplifier Modules, each
E2088/E2322 Power Supply module can be removed or replaced, within seconds, whilst the
Transmitter is operating (as long as either the ‘A’ or ‘B’ supply has three E2088/E2322 modules
remaining). Red/green fault displays, low module weight and small size again feature.
50-53Vdc outputs for each Amplifier, for all the low power single units and mains supplies for each
Exciter are provided via separate fuses at the rear of the Transmitter. The Power Supply monitor
connectors go to one of two independent internal Transmitter control buses and hence to the E2023
Controller.
1.1.4 : E2023 Transmitter Controller Unit
This single unit provides comprehensive monitoring of the forward power, current and temperature of
each E2021 Amplifier Module and of the final output forward power, reverse power and temperature
via the E2026 Drive Changeover/Output Monitor. It also monitors the E2088/E2322 Power Supply
Modules. In the situation where dual drive automatic changeover or automatic power level control is
used, this unit provides the necessary control. Remote control and monitoring of the Transmitter can
also be provided via this unit using parallel or serial data.
The Control Unit is microprocessor based with a back illuminated, high contrast 4 line by 20 character
display and separate red/green ‘System Normal’ indicator. A robust, sealed membrane keypad is
provided with a sounder to indicate correct key entry. The rear of the unit has separate connectors for
the two independent internal Transmitter control buses, connectors to monitor and control one or two
Exciters, a connector for power level control and a connector for parallel monitoring. An RS232
monitor/control port is provided on the front panel (E2023-01/02) with an additional TCP/IP
monitor/control port on the rear (E2023-02 only). An RS232 monitor/control port is provided on the
rear panel (E2023-03/04) with an additional TCP/IP monitor/control port on the rear (E2023-04 only).
When the RS232 port is provided on the rear panel, no parallel monitoring is available.
If a fault should occur within the E2023, manually operated switches on the E2026 Drive
Changeover/Output Monitor Unit can be used for basic control of the Transmitter. This enables it to be
kept ‘on-air’ whilst the E2023 is replaced.
1.1.5 : E2026 Drive Changeover/Output Monitor (and Splitter) Unit
This single unit interfaces between the Exciter(s) and the multiple E2021 Amplifier Module inputs. The
splitter section within the unit is a four way Wilkinson power utilising standard coaxial cable and is thus
easily repaired if any become damaged. All outputs are brought to TNC connectors at the rear of the
unit. Phase length matched, 50coax leads then connect these outputs to the E2021 inputs via four
off four way matching units mounted separately behind the lowest row of E2021s.
This unit also contains circuitry to measure the Transmitter’s final output forward and reverse powers,
via a coupler in the E2028, and the temperature of the E2028 Combiner’s dumping load heatsink (see
1.1.6). Front panel red/green displays indicate any fault condition. Two multi-turn preset High or Low
Power potentiometers are accessible via the front panel to enable independent setting of two
Transmitter output powers. They are selected using various forms of local, external or remote control
or via a link on the Fan connector Board (see section 3.4.2). A front panel connector is provided to
give a test sample of the Transmitter’s output forward power.
As with the E2023, the rear of the E2026 has separate connectors for the two independent internal
Transmitter control buses. As previously detailed, each control bus has its own RS485 data bus, one
of which is used to carry the monitored serial information from the E2026 to the E2023 Control Unit.

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For these two buses, the E2026 also provides two equal but independent power level control voltages
(derived from either the front panel High or Low Power potentiometers) to set the power level of the
E2021 Amplifier Modules and thus the final Transmitter output power. One control voltage is used for
the Amplifier Modules on the right hand A side of the transmitter and the other for the Amplifier
Modules on the left hand B side.
A front panel lockable toggle switch is provided to manually mute or start (i.e. demute) the Transmitter
or can be set to enable the E2023 Control Unit to select high/low power or to mute/demute the
Transmitter as part of an automatic control sequence. An interlock switch connector is also provided
on the rear to enable the open-circuiting of external switches placed at safety points (e.g. at Antenna
access gates) to automatically mute the Transmitter. The state of this circuit is displayed on a front
panel indicator.
The E2026 can also provide manual or automatic dual drive changeover in conjunction with the E2023
Control Unit. A second front panel lockable toggle switch is provided on the E2026 to manually select
which Exciter (i.e. ‘Drive’) is to be used, or to enable the E2023 to automatically select the second
Exciter should the first one fail. Switching is performed by two coaxial RF relays within the E2026.
These direct one of two Exciter’s outputs to the internal splitter and the other to a dumping load. This
dumping load has to be provided (externally to the E2026) whenever two Exciters are supplied and the
Exciter not in use is required to remain ‘active’ or be tested. Three TNC connectors are provided at the
rear of the unit to connect to Exciter(s) and dumping load. Front panel indicators show which Drive is
selected.
1.1.6 : E2028 16 Way Combiner Unit
This single unit interfaces between the multiple E2021 Amplifier Module outputs and the antenna.
Phase length matched, 50coax leads connect the E2021 outputs to the TNC connectors at the
bottom rear of this unit. The combiner section within the unit is a sixteen way Wilkinson power
combiner, followed by a matching section, utilising standard handformable and flexible coaxial cable.
The combiner section is followed by an integral low pass filter, this removing harmonics of the wanted
frequency. An output directional coupler is then provided with an EIA 7/8 (S7604) or EIA 1 5/8
(S7605C) output socket for connection to the antenna. This coupler provides output forward and
reverse power samples, via coax connections, to the E2026 Drive Changeover/Output Monitor (see
1.1.5).

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1.2 : VARIANTS AND OPTIONS
The main variants and their constituent modules and units are as follows :-
Amplifier
Modules
Power
Supplies
Transmitter
Auto. Cont.
Output
Monitor and
Drive C/O
Combiner
Unit
S7604-01
4kW Max.
Single Phase
230V Supply
16 off
E2021-XX
8 or 12 off
E2088-01
or E2322-01
Single
E2023-XX
Single
E2026-02
Single
E2028-01
S7604-02
4kW Max.
Three Phase
230/400V Supply
16 off
E2021-XX
9 off
E2088-01
or E2322-01
Single
E2023-XX
Single
E2026-02
Single
E2028-01
S7605-05
5kW Max.
Single Phase
230V Supply
(S7605C)
16 off
E2021-XX
8 or 12 off
E2088-01
or E2322-01
Single
E2023-XX
Single
E2026-02
Single
E2028-02
S7605-07
5kW Max.
Three Phase
230/400V Supply
(S7605C)
16 off
E2021-XX
9 off
E2088-01
or E2322-01
Single
E2023-XX
Single
E2026-02
Single
E2028-02
The options (identified by a letter suffix) are as follows :-
/P
Fitted with four additional E2088/E2322 Power Supply Modules
(S7604-01 and S7605-05 only)
/T
Fitted with TCP/IP Remote Control (E2023-02 or E2023-04 Controller)
Examples are as follows :-
S7604-01
Standard 4kW Transmitter (single phase, 230V supply)
S7605-05/P
Compact S7605C 5kW Transmitter, with four additional E2088/E2322 PSUs
giving twelve total (single phase, 230V supply)
S7605-07/T
Compact 5kW Transmitter, with TCP/IP remote control)
(three phase, 230/400V supply)

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1.3 TECHNICAL SPECIFICATIONS
The S7600 range of FM Transmitters is designed to meet or exceed ETSI Standards:-
EN 301 489-01 : ERM/EMC for Radio Equipment, Part 1, Common Technical Requirements.
EN 301 489-11 : ERM/EMC for Radio Equipment, Part 11, Specific Conditions for FM Transmitters.
EN 302 018-02 : ERM (Spectral Occupancy) for the FM Radio Broadcast Services.
EN 60215:1989 : Safety Requirements for Radio Transmitting Equipment
Note that the following figures do not include any which principally depend on the Exciter/Drive being
used (e.g. frequency stability). The figures given below may also be affected by the Exciter/Drive’s
performance. In both cases the Exciter/Drive’s own manual should be consulted.
.
RF Interface Ports
50nominal
Input Drive Power
RF Input from Exciter/Drive supplied :-
70-80W for S7604 (100W absolute maximum)
85-100W for S7605C (125W absolute maximum)
Output Power Level
With any load with a return loss 14dB (1.5:1 VSWR) any angle.
(though see note below in ‘Output Power shutdown’ section)
Note two independent settings available for selection.
Adjustable at least 1.6kW to 4kW for S7604 (Power Low setting)
Adjustable at least 2.4kW to 4kW for S7604 (Power High setting)
Adjustable at least 2kW to 5kW for S7605C (Power Low setting)
Adjustable at least 3kW to 5kW for S7605C (Power High setting)
Output Power
Variation
Not more than 1dB under all specified operating conditions.
Output Power
Shutdown
Output power is automatically reduced or shutdown to ensure that any load
with return loss 10dB including open and short circuits, does not cause any
damage to the transmitter.
The return loss level at which shutdown starts can be increased by an
internal adjustment (see section 2.3.3). This level is normally set at the
factory to be 16dB, the level at which excess reverse power first produces a
warning indication.
Output Reverse
Intermodulation
Reverse intermodulation products will be better than or equal to –10dB,
relative to the interfering incident signal, this being offset over the range
300kHz to 20MHz (but remaining within 87.5MHz to 108MHz).
Frequency Range
87.5 -108MHz
Spurious Emissions
In the range 9kHz to 1000MHz : -
Better than or equal to –82dBc (S7604) or –83dBc (S7605C)
Out of Band
(Adjacent Channel)
Emissions
Better than or equal to –110dBc/Hz, at 200kHz offsets, and 145dBc/Hz at
2MHz. When measured in a 1kHz bandwidth, the limit figures become –
80dBc at 200kHz offsets and –115dBc at 2MHz.
Incidental
Amplitude
Modulation
Synchronous (AM due to FM) :-
Not greater than 2% with a peak deviation of 40kHz at a modulation
frequency of 500Hz.
Asynchronous (residual AM due to hum and noise with no FM modulation) :-
Not greater than 1% when measured unweighted in a 20Hz to 20kHz
bandwidth.

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Status Indications
Output forward and reverse power and combiner temperature.
Output forward power, temperature and current of any selected Amplifier
module.
Power Supplies, Cooling fans and (when connected) Drives status.
Red/green pass/fail led indicators on all modules.
Dimensions
Height :- 26U
Width :- to fit standard 19in rack.
Depth :- to fit standard 600mm deep rack.
Environmental
Ambient Temperature (operating) : -5 to +50 deg.C
Ambient Temperature (storage) : -20 to +70 deg.C
Relative Humidity (operating) : Less than or equal to 95%, non condensing
with the transmitter at a higher temperature than the ambient.
Altitude (operating) : Up to 3000 metres a.s.l.
Power Supply
S7604-01 and
S7605-05
Four independent single phase inputs.
195 to 255V AC, 50- 60Hz. (note that earlier versions included mains input
relays)
Apparent power factor 98%
Efficiency 88% (Power Supply units only)
S7605C Supply currents (at 5kW RF output) typically :-
8.5A at 230V AC at each of the four inputs.
Typical overall efficiency 55% at above power levels (AC in to RF out). See
note below.
Note - At the required output frequency, overall efficiency of typically 64% can
be achieved by optimising power supply voltage. This will be at the expense
of the performance at other frequencies but can be reversed in the field.
Tests carried out under factory conditions.
Power Supply
S7604-02 and
S7605-07
Single three phase plus neutral (plus protective earth) input.
305 to 455V AC phase to phase (176 to 264V phase to neutral) 47- 63Hz.
Apparent power factor 98%.
Efficiency 88% (Power Supply units only)
S7605C Supply current (at 5kW RF output) typically :-
34A total at 230V AC (phase to neutral)
Typical overall efficiency 55% at above power levels (AC in to RF out). See
note below.
Note - At the required output frequency, overall efficiency of typically 64% can
be achieved by optimising power supply voltage. This will be at the expense
of the performance at other frequencies but can be reversed in the field.
Tests carried out under factory conditions.

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SECTION TWO : INSTALLATION
! CAUTION !
These Transmitters operate at high RF power levels, internal supply energy levels and mains
supply current levels. They also incorporate devices containing toxic BeO. Before commencing
installation, it is recommended that the complete INSTALLATION section is read and understood. The
instructions should then be strictly followed, by suitably qualified personnel, otherwise sub-
standard or even dangerous operation may result.
It is also strongly recommended that a mechanical check is made of the Transmitter, before it is
installed and switched on. This is to ensure that no loosening of connectors or damage has occurred,
during transit, which may lead to further damage being caused at switch-on. The principal items to
check are : -
No obvious physical damage has occurred to the Transmitter frame, modules or internal wiring.
All removable, internal RF coaxial connectors (SMA/B/C, BNC, TNC, N etc) are in place and tight.
All internal multi-way connectors (Ribbon, D Type, Molex etc) are in place and secure.
Each E2021 Amplifier Module is pushed fully into the Transmitter with its lock switch fully pushed
down –do not try to force these modules home –if they appear difficult to insert fully, check that
the locating ‘harpoons’ at the rear of each module (either side of its D connector) are not bent.
Each E2088/E2322 Power Supply Module is pushed fully into the Transmitter with its locking lever
engaged –do not try to force these modules home –if they appear difficult to insert fully, check the
connectors at the rear of the module.
2.1 : PHYSICAL DIMENSIONS AND FITTING
2.1.1 Installation Items
Various installation items are required. A list of these (including spare fuses) is given below. Actual
requirements depend on the configuration of the equipment supplied (e.g. with or without
Exciter/Drive(s), separate to or already fitted into a 19 inch rack, whether or not leads are supplied
ready made etc.). Note that extra, unlisted parts may be required for connections to any
Exciter/Drive(s) that are supplied (see manuals supplied with them).
Typical
Quantity
Description
Function
2
6 Way, 16A/440V, free sockets with
top entry hoods
(e.g. ‘Contact Connectors’ H-BE
part numbers 10-1910 for insert
and 10.0110+12.9543 for hood)
For connection to leads from mains supply
distribution point
(single phase S7604-01 and S7605-05)
4
Length
as req’d
3 core, 2.5mm2 per core, type SY,
flexible steel armoured cable.
Mains supply leads
(single phase S7604-01 and S7605-05).
4
16A ‘C’ rated 2 pole miniature circuit
breakers (MCBs).
Fitted at mains supply distribution point to
protect supply leads and mains input
components in the Transmitter.
(single phase S7604-01 and S7605-05)
1
6 Way, 35A/440V, free socket with
side entry hood
(e.g. ‘Contact Connectors’ H-BS
part numbers 10.1710 for insert
and 10.0820+12.9546 for hood)
For connection to lead from mains supply
distribution point
(three phase S7604-02 and S7605-07)

Print Date 21/02/23 Page 14 of 36 S7604-00MA-03a
Typical
Quantity
Description
Function
1
Length
as req’d
5 core, 6mm2 per core, type SY,
flexible steel armoured cable.
Mains supply lead.
(three phase S7604-02 and S7605-07)
1
3
32A ‘C’ rated four pole miniature
circuit breakers (MCB).
OR
32A ‘C’ rated single pole miniature
circuit breakers (MCBs)
Fitted at mains supply distribution point to
protect supply lead and mains input components
in the Transmitter.
(three phase S7604-02 and S7605-07)
1
EIA 7/8 free connector/bullet.
For connection to lead from Antenna or RF
output load (S7604).
1
EIA 1 5/8 free connector/bullet.
For connection to lead from Antenna or RF
output load (S7605C).
Length
as req’d
Low loss 50RF coaxial cable, rated
in excess of Transmitter output
power at maximum ambient
temperature.
RF output lead.
1 - 3
TNC 50RF coaxial free plug(s).
For connection to leads from Exciter/Drive(s)
and their dummy load.
Length
as req’d
Low loss 50RF coaxial cable, rated
in excess of Exciter/Drive output
power at maximum ambient
temperature.
RF input and dummy load leads.
1
Coaxial, 87.5 –108MHz, 50load
with suitable free connector, rated in
excess of Exciter/Drive output power
at maximum ambient temperature.
Exciter/Drives’ dummy load.
1
2 Way, 10A, 5.08mm pitch screw
terminal block (c/w wire shorting link).
(e.g. Weidmuller BL5.08/2)
External safety interlock connector (wire shorting
link is removed when connector is wired to
external safety circuits).
1 - 2
9 Way D plugs c/w covers.
For connection to leads from control/monitor
inputs of Exciter/Drive(s).
1 - 2
9 Way D sockets c/w covers.
For connection to parallel and serial RS232
remote control/monitor links.
1
15 Way D plug c/w cover.
For connection to additional control/monitor
input links.
Length
as req’d
Multi-core screened cable (number of
cores as required).
Control/monitor leads.
2
SMC right angle free plugs fitted with
cable as required
For FWD/REV power monitor analogue outputs.
Length
as req’d
Heavy gauge grounding wire/strap.
For safety earth lead.
1-2
IEC 6A free plug to free socket mains
leads (1 metre, 3 core each
0.75mm2, EPR insulated, HOFR
sheathed for high temperatures)
For fused and switched mains supply
connections to Exciter/Drive(s).

Print Date 21/02/23 Page 15 of 36 S7604-00MA-03a
Typical
Quantity
Description
Function
12
Screws c/w plastic cup washers and
rack caged nuts.
For fixing S7604 or S7605C into 19 inch rack.
2
Side support ‘L’ brackets c/w fixing
screws and washers.
For extra support to carry the Transmitter’s
weight in the rack.
17
500mA (F) Fuses (for smd holders,
‘Littelfuse’ R451.500)
For protection of control circuits within E2021
Amplifiers and E2026 Drive C/O/Output Monitor.
16
16A (T) HBC 5x32mm (¼ x1¼ in)
Fuses
For protection of internal dc supply leads to and
high current circuitry within E2021 Amplifiers.
4
6.3A (T) HBC 5x20mm Fuses
For protection of internal low current dc supply
leads and of mains supply leads and circuitry
intended for connection to Exciter/Drives(s).
2.1.2 Rack Mounting
If the Transmitter is not supplied ready mounted in a 19 inch rack, this will be required to be done at
time of installation.
! CAUTION !
The S7604 and S7605C (i.e. the assembly carrying the Amplifiers, Power Supplies, Controller, Drive
Changeover/Output Monitor and Combiner) are heavy. Before installation in a rack, the Amplifier
Modules and Power Supplies should be removed to reduce the overall weight and ease the process.
These units are removed from the front of the Transmitter, taking care to release the mechanical
securing locks first. The Fan Assembly may also be opened, unplugged and then removed from the
rear of the Transmitter.
The 19 inch rack should be of standard 600mm depth and at least 26U height. Additional height will be
required if Exciter/Drive(s) are to be fitted into the same rack (recommended). These should be fitted
below the actual Transmitter section for ease of inter-wiring.
Additional bottom support ‘L’ brackets are also be required at each side, below the Transmitter, to
help carry its’ weight. The Transmitter is then fixed to the front of the racking using twelve screws,
plastic cup washers and caged nuts. The Amplifier modules, Power Supplies and Fan Assembly can
then be refitted and external connections made.

Print Date 21/02/23 Page 16 of 36 S7604-00MA-03a
2.2 EXTERNAL CONECTIONS
2.2.1 Mains Supply Connectors (single phase S7604-01 and S7605-05)
These are two independent 6 Way plugs at the rear of the Supply Disconnector section, CON02 and
CON03. Having two enables use of independent ‘A/B’ power sources with the same or different
phases. Each supply must be single phase, 195V to 255V AC, 50- 60Hz.
One supply (normally ‘A’) is always directed to the ‘A’ and ‘C’ groups’ Power Supply Modules and the
other ‘B’ supply is always directed to the ‘B’ and ‘D’ groups’ Power Supply Modules. The maximum
total current drawn from the ‘A’ supply is in the order of 16A (S7604) or 20A (S7605C) and the same
from the ‘B’ supply (at 230V AC with 4kW or 5kW RF output respectively).
! CAUTION !
The S7604 and S7605C MUST NOT be operated at voltages significantly below 195V, as the
supply current may exceed the rating of the two 2x16A mains supply connectors and
associated wiring and components. Fitting of the specified MCB (see next paragraph) will ensure
this cannot occur.
! CAUTION !
The mains supply leads (four total) to the Transmitter must each consist of three core (P+N+protective
earth) insulated cable. Each core must be at least 2.5mm2and the overall cable armoured (type SY
flexible steel armoured cable preferred) and not mounted in a conduit with other supply cables.
Four double pole, 16A (C rated) MCBs must be provided at the supply distribution board(s) to
protect both leads and Transmitter supply input circuitry. Also, since the supply input circuitry
contains filters, which pass current to the Transmitter chassis, the Transmitter chassis must be
connected to a safety ground.
Also ensure whilst making any connections to the mains supply, that the Transmitter’s front
panel Supply Disconnector is switched to ‘off’ (i.e. at O) and is preferably padlocked in that
position to prevent inadvertent operation of the Transmitter.
Each lead terminates in a separate 6 Way 16A/440V free socket at the Transmitter end, which are
wired as follows :-
Pin 1
Line #1
Pin 2
Neutral #1
Pin 3
Prot. Earth #1
Pin 4
Line #2
Pin 5
Neutral #2
Pin 6
Prot. Earth #2
Earthing Pin
Prot. Earth
The two leads from a connector must both go the same supply via separate MCBs.
The armouring of the cable should also be taken to ground at the supply distribution board.
The free connectors should be fitted with top entry hoods.
An earthing bolt is provided adjacent to the mains supply input connector to allow the Transmitter
chassis to be permanently bonded to nearby safety ground directly or via rack metalwork.

Print Date 21/02/23 Page 17 of 36 S7604-00MA-03a
2.2.2 Mains Supply Connector (three phase S7604-02 and S7605-07)
This is a 6 way plug, CON02, at the rear of the Supply Disconnector section. The supply must be three
phase plus neutral, 176-264V AC phase to neutral, 305-455V AC phase to phase and 47-63Hz.
Provision is made for a protective earth. The maximum current drawn from each phase (at 230/400V
AC) is in the order of 10.5A (S7604-02) or 13.5A (S7605-07).
! CAUTION !
The S7604 and S7605C MUST NOT be operated at voltages significantly below 176V AC phase
to neutral, 305V AC phase to phase, as the supply current may exceed the rating of the 35A
mains supply connector and associated wiring and components. Fitting of the specified MCB
(see next paragraph) will ensure this cannot occur.
! CAUTION !
The mains supply lead to the Transmitter must consist of five core (3P+N+protective earth) insulated
cable. Each core must be at least 6mm2and the overall cable armoured (type SY flexible steel wire
armoured cable preferred) and not mounted in a conduit with other supply cables.
A four pole, 32A (C rated) MCB must be provided at the supply distribution board to protect
both lead and Transmitter supply input circuitry.
Alternatively (to give supply breaker redundancy) three separate single pole 32A (C rated)
MCBs may be used, one in each phase line at the supply distribution board.
Also, since the supply circuitry contains filters, which pass current to the Transmitter chassis, the
Transmitter chassis must be connected to a safety ground.
Also ensure whilst making any connections to the mains supply, that the Transmitter’s front
panel Supply Disconnector is switched to ‘off’ (i.e. at O) and is preferably padlocked in that
position to prevent inadvertent operation of the Transmitter.
The supply lead terminates in a 6 Way 35A/440V free socket at the Transmitter end, which is wired as
follows :-
Pin 1
Phase #1
Pin 2
Phase #2
Pin 3
Phase #3
Pin 4
Neutral.
Pin 5
Prot Earth #1
Pin 6
Prot Earth #2
Earthing Pin
Prot. Earth
The armouring of the cable should also be taken to ground at the supply distribution board.
The free connector should be fitted with a side entry hood.
An earthing bolt is provided adjacent to the mains supply input connector to allow the Transmitter
chassis to be permanently bonded to nearby safety ground directly or via rack metalwork.
Note that the individual three phase input leads MUST NOT be connected, in parallel, to a
single phase supply.
.

Print Date 21/02/23 Page 18 of 36 S7604-00MA-03a
2.2.3 RF Output Antenna Connector
! CAUTION !
When operating, high RF Voltages are present on this connector. Always ensure when making
connections here, or working on any load connected, that the Transmitter’s front panel Supply
Disconnector is switched to ‘off’ (i.e. at O) and is preferably padlocked in that position.
This is a 50EIA 7/8 (S7604) or 1 5/8 (S7605C) coaxial socket on the E2028 Combiner Unit’s output
directional coupler (at the top rear of the Transmitter). Care must be taken to use adequately rated (at
maximum ambient temperature) low loss cable for the lead to the antenna or load
2.2.4 RF Input Exciter/Drive(s) Connectors
! CAUTION !
When operating, high RF Voltages may be present on these connectors. Always ensure when
making connections here, or working on any load connected, that the drive source(s) to the
Transmitter are switched off or safely muted.
These are three 50TNC coaxial sockets at the centre rear of the E2026 Drive C/O /Output Monitor
Unit. Socket SK09 (Drive A) is for connection a single Exciter/Drive’s RF Output. When dual drive
changeover is supplied, socket SK07 (Drive B) is used for connection to the second Exciter/Drive’s RF
Output. In this case, socket SK08 (Load) is used for connection a 50Exciter/Drive dummy load,
normally situated in the section of the rack where the Exciter/Drives are fitted.
2.2.5 Safety Interlock Connector
This is a removable, 2 Way, 5.08mm screw terminal block, PL11, at the rear of the E2026 Drive C/O
/Output Monitor Unit. A shorting link has to be made between the terminals to de-mute the Transmitter
(the front panel INTERLOCK EXT. MUTE display goes from red to green when the terminals are
linked). If there are no external safety interlock switches, a short direct link is made, this being the
state in which the connector is normally supplied. If connections need to be made to external safety
switches, this link is removed and the switches are wired in a series loop to the connector so that if
any switch opens, the link is broken.
! CAUTION !
For the safety interlocks to work correctly, the external switches and link wiring must ‘float’
(i.e. must not be grounded at any point). The total loop resistance should not exceed approximately
100. The external wiring may also be ferrite loaded for emc requirements. No external voltages
should be applied to this connector.
2.2.6 RF Output Monitor Connector
This is a 50BNC coaxial socket SK01 on the left-hand side of the E2026 Drive C/O /Output Monitor
Unit front panel. This provides an filtered sample of the Transmitter’s forward output power at a level,
into 50, approximately 60dB below the power being delivered into the load (e.g. approximately 4-
5mW for 4-5kW being delivered). This connector is for test purpose only with the test equipment and
lead being disconnected when not in use. NOTE that the levels of any harmonics present are not
necessarily equal to those at the antenna.
2.2.7 Drive A/B Monitor and Control Connectors
These are two identical 9 Way D sockets SK03 and SK06 at the rear of the E2023 Controller unit.
These are used to enable one or two Exciter/Drive(s) to be monitored and controlled by the E2023
(with two Exciter/Drives this enables automatic dual Exciter/Drive changeover). Multi-core screened
cable, not exceeding 3 metres in length, should be used for the interconnecting leads.

Print Date 21/02/23 Page 19 of 36 S7604-00MA-03a
Each lead terminates in a separate 9 Way free D plug at the E2023 end which is wired as follows :-
Pin 1
RS232 Data from Drive (not enabled)
Pin 2
Ground
Pin 3
Prefer Drive from Rem. Control
Momentary low > approx. 1sec
Pin 4
Slow Status Monitor from Drive
Continuous low >2secs registers ‘good’
Continuous high >10secs registers ‘fail’
Pin 5
Fast Status Monitor from Drive
Continuous low >2secs registers ‘good’
Continuous high >2secs registers ‘fail’
Pin 6
RS232 Data to Drive (not enabled)
Pin 7
Ground
Pin 8
Ground
Pin 9
Mute/demute to Drive
Continuous low to mute
Each input (pins 3, 4, 5) is internally ‘pulled up’ to +5V through 12kand must be fed from a voltage
free source of less than 1kto ground for a low state (open-circuit for a high state). These inputs are
protected against constant application of up to 12V dc directly applied.
The mute/demute output (pin 9) is an ‘open collector’ NPN, silicon low saturation switching transistor
suitable for driving loads from +5V to +24V dc with maximum currents of 10mA. The low state output
impedance is approximately 10.
These connections are wired in accordance with the monitor and control requirements of the type of
Exciter/Drive(s) supplied and normally, not all the pins will need to be connected. Pin 3, if used, is for
connection to a remote control and monitoring system. This enables selection of a particular drive to
be preferred (forced) remotely by momentarily pulling this line to ground.
If automatic dual Exciter/Drive changeover only requires one of the two status monitor inputs for
operation, the other must be connected to ground.
2.2.8 Parallel (E2023-01/02) or RS232 Serial Remote Control DTE Connector (E2023-03/04)
This is a 9 Way D plug PL04 at the rear of the E2023 Controller unit. It is used to enable various forms
of remote control and monitoring, possibly requiring additional external units. Multi-core screened
cable, not exceeding 3 metres (parallel) or 30 metres (serial) in length, should be used for the
interconnecting lead.
The lead terminates in a 9 Way free D socket at the E2023 end which is wired as follows :-
Parallel
Serial RS232
Pin 1
Power Output Low (app.–2dB rel. set output)
Not connected
Pin 2
Power Output Fail (app. –12dB rel. max o/p)
Received Data (to E2023)
Pin 3
Reverse Power High (app. 100W or 125W)
Transmit Data (from E2023)
Pin 4
Combiner Temp. High (app. +100deg.C)
Not Connected
Pin 5
Ground
Ground
Pin 6
Fan/Cooling System Fail
Not Connected
Pin 7
System Normal
Not Connected
Pin 8
Drive A/B Selected
Not Connected
Pin 9
Drive Changeover on Auto
Not Connected
The parallel outputs are ‘open collector’ NPN, silicon low saturation switching transistors suitable for
driving loads from +5V to +24V dc with maximum currents of 10mA. The low state output impedance
is approximately 100. Each output is protected against constant application of up to 5V dc directly
applied. A normal (non-faulty) condition is indicated by the output pin being pulled to ground (i.e. low
state) by the switching transistor. Drive A selected and Drive C/O on Auto are similarly indicated.

Print Date 21/02/23 Page 20 of 36 S7604-00MA-03a
The serial RS232 outputs are used to enable down loading of status and to enable simple control
using a personal computer (PC) directly connected to this rear panel COM/DTE port.
Note that the assigned pin numbers and their functions are for a standard 9 pin plug on ‘Data Terminal
Equipment’ (DTE) such as computers. Standard crossover or ‘null modem’ leads may thus be used for
connection to a personal computer or PC. The length of the interconnecting lead may be extended by
use of compatible RS422/485 or fibre-optic line drivers.
Note also that the serial option requires an additional internal link lead, which re-directs the serial
remote control from the front panel COM port to the rear panel DTE connector.
Full details of serial remote control procedures via this connector are given in Section 2.4
2.2.9 Second Transmitter Remote Control Connector
This is a 15 Way D socket SK05 at the rear of the E2023 Control Unit. It is used to enable externally
derived automatic control of Transmitter muting and high/low power level setting. Multi-core screened
cable, not exceeding 3 metres in length, should be used for the interconnecting lead.
The lead terminates in a 15 Way free D plug at the E2023 end which is wired as follows :-
Pin 1
Select Low Power Input (continuous low to select)
Pin 2
Mute Transmitter Input (continuous low to mute)
Pin 3
Output Status A (continuous low state –not used)
Pin 4
Output Status B (continuous low state –not used)
Pin 5
RS485 Data (+) In (not used)
Pin 6
RS485 Data (-) In (not used)
Pin 7
RS485 Data (+) Out (not used)
Pin 8
RS485 Data (-) Out (not used)
Pin 9
Not Connected
Pin 10
Ground
Pin 11
Ground
Pin 12
Ground
Pin 13
Ground
Pin 14
Not Connected
Pin 15
Not Connected
Each input (pins 1, 2) is internally ‘pulled up’ to +5V through 12kand must be fed from a voltage free
source of less than 1kto ground for a low state (open-circuit for a high state). These inputs are
protected against constant application of up to 12V dc directly applied. Note that they are only active
when the associated E2026 Auto-Mute-Start switch is in the Auto position and have delays in the
order of 200mS. Thus, they should not be used as part of a safety interlock system (see 2.2.5).
Each output (pins 3, 4) is a relay contact to ground for a low state (open-circuit for a high state). The
contacts are rated at 1mA (minimum at 5V dc) to 1A maximum switching current. The maximum
voltage (including switching surges) must be limited to 24V dc. These outputs (and pins 5-8 inc.) are
not used and thus should not be externally connected.
2.2.10 Mains Supply Output Connectors
These are two standard IEC three pin (L+N+PE) sockets CON01 and CON04 either side of the mains
supply input connectors. Each one is connected, via the front panel SUPPLY DISCONNECTOR
switch to the mains supply input which is adjacent to it (single phase variants) or to different phases
(three phase variants). Thus equipment connected to these supplies can be arranged in two
independent groups, both groups being switched off when the Transmitter itself is switched off using
the front panel switch.
The continuous total load on output each should not exceed approximately three amps. Each output is
protected by a 6.3A (T) HBC fuse, FS19 and FS20, to allow for current surges at ‘switch-on’.