Eddystone S79005 Owner's manual

Print Date 08/04/14 Page 1 of 34 S79005-00MA-05
Eddystone Broadcast
----
S7900 Series
S79005 500W
Low Power
FM Transmitter
----
Installation
and
Operation
----
Issue 5
S79005-00MA-05
April 2014
----
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 or E2322 Power Supply Unit….………..…………………………………………. Page 6
1.1.3 E2023 Transmitter Controller Unit……………………………..…………………………. Page 6
1.1.4 E2026 Drive Changeover/Output Monitor (and Splitter) Unit………………...…………Page 7
1.1.5 E2029 Two Way Combiner Unit………………………..…………………………...…….. Page 7
1.2 : VARIANTS AND OPTIONS…………………………………………………………………Page 8
1.3 : TECHNICAL SPECIFICATIONS……………………………………………………………Page 9
SECTION TWO : INSTALLATION
2.1 : PHYSICAL DIMENSIONS AND FITTING………………………………………………… Page 11
2.1.1 Installation Items …………………………………………………………………………….Page 11
2.1.2 Rack Mounting………………………………………………………………………………. Page 13
2.2 : EXTERNAL CONECTIONS……………………………………………………………….. Page 14
2.2.1 Mains Supply Connector (-01, -02, -03, -04 single mains supply variants)…………... Page 14
2.2.2 Mains Supply Connector (-05, -06, -07, -08 dual mains supply variants)…….……… Page 15
2.2.3 RF Output Antenna Connector……………………………………………………………..Page 16
2.2.4 RF Input Exciter/Drive(s) Connectors…………………………………………………….. Page 16
2.2.5 Safety Interlock Connector………………………………………………………………….Page 16
2.2.6 RF Output Monitor Connector……………………………………………………………... Page 16
2.2.7 Drive A/B Monitor and Control Connectors ………………..……………………………. Page 16
2.2.8 Parallel (standard) or RS232 Serial Remote Control DTE Connector………………... Page 17
2.2.9 Second Transmitter Remote Control Connector………………………………...…...…. Page 18
2.2.10 Mains Supply Output Connectors………………………………………………………. Page 18
2.2.11 RS232 Serial Control and Monitor (COM) Connector ………..………….…………….Page 19
2.2.12 TCP/IP Control and Monitor Connector (/T option only)………………….…...….……Page 19
2.2.13 FWD/REV Output (Analogue Monitor) Connectors……………………………………. Page 19
2.2.14 +48V DC Output Connector (-07 and –08 variants only)……………………...………Page 19
2.3 : SETTING UP PROCEDURES…………………………………………………………….. Page 20
2.3.1 Fuses…………………………………………………………………………………………. Page 20
2.3.2 Output Power Level and Frequency Adjustment…………………………………………Page 21
2.3.3 Reverse Power Trip Level Adjustment…………………………………………………….Page 22
2.3.4 Serial Remote Control Baud Rate Setting ………………………………………………. Page 23
2.4 : SERIAL REMOTE CONTROL AND MONITORING…………………….………………..Page 24
2.4.1 Introduction……………………………………………………………………….…………. Page 24
2.4.2 Control Commands and Status Monitor Requests……………………………………… Page 24
2.4.3 Reverted Status Monitor Information………………………………………………………Page 26
SECTION THREE : OPERATION
3.1 : CONTROLS AND DISPLAYS…………………..…………………………………..……… Page 29
3.1.1 E2021 Amplifier Module……………………………………………………………………. Page 29
3.1.2 E2088 Power Supply Unit…..………………..…………….………………………..…….. Page 29
3.1.3 E2322 Power Supply Unit…..………………..…………….………………………..…….. Page 30
3.1.4 E2023 Transmitter Controller Unit……………………………………………….……….. Page 30
3.1.5 E2026 Drive Changeover/Output Monitor Unit…………………..……………………… Page 31
3.1.6 Supply Disconnector…………………..…………………………………………………….Page 31

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3.2 : MANUAL CONTROL……………………………………………………………………….. Page 32
3.3 : MANUAL MONITORING…………………………………………………………………... Page 32
3.4 : AUTOMATIC CONTROL………………………………………………………………….. Page 33
3.4.1 Exciter/Drive Control and Monitoring…………………………………………………….. Page 33
3.4.2 Muting and Reduced Power Operation……………………………………………………Page 33
Bound at Rear
Front and Rear Panel Views………………………..……………………..…..….……. S79005-00GA
Block Diagram……………………………………………………………………………. S79005-00BK
Interconnections Circuit Diagram…………………………………………………….… S79005-00CT

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SECTION ONE : INTRODUCTION
! CAUTION !
This Transmitter operates at high RF power levels, internal supply energy levels and mains
supply current levels. It also incorporates 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 (apart from fuse changing which is detailed in INSTALLATION).
1.1 : GENERAL DESCRIPTION
The S79005 Low Power FM Transmitter provides output power of up to and including 500W (used
singly) or 1kW (using combined pairs) in the standard Band ll frequency range of 87.5-108MHz. It is
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 Transmitter is 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 7U height.
All that is required is a connection to a mains supply, to an antenna and to the Exciter/Drive(s). When
used in pairs, to generate up to 500W, an additional two-way splitter, combiner and approximately
250W 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 S7900 series is its ability to remain ‘on-air’. The use of multiple Amplifier and
(apart from the S79005-01 and -03) 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’ (again, apart from the Power Supply on the S79005-
01 and -03). 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 – 5 inc.). Front and rear
views, block and circuit diagrams, showing these modules are bound at the rear of this manual
(S79005-00GA, S79005-00BK and S79005-00CT).
Workshop editions of this manual contain extra information, also bound at the rear, which gives
detailed test procedures, circuit diagrams, assembly diagrams, layouts and parts lists.
1.1.1 : E2021 300W Amplifier Module
Two 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. Failure of a single Amplifier Module gives an approximately 6dB reduction in
power, with the Transmitter still operating.
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
immediate technical investigation being required. The relatively low weight and small size of each
module assist their actual transport to site.

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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, 48V 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 Unit, 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 (E2021-XX where XX indicates
version). These versions have slightly different internal circuitry. They are interchangeable but, since
this Transmitter only has two fitted, to maximise output power, both modules should be the same
version (or all four in a combined pair of Transmitters).
1.1.2 : E2088 or E2322 Power Supply Unit
All variants except -01 and -03 (Psu1) have two Power Supply Units fitted (Psu1 and Psu2). E2088
PSU’s are fitted on -01, –02, -05 and -07 variants. E2322 PSU’s are fitted on -03, –04, -06 and –08
variants. Note that the two types are not interchangeable. The –01 to –04 variants have a single mains
supply input. The –05 to –08 variants have dual mains supply inputs to give greater redundancy.
Psu1 and Psu2 are OR’d to provide supply buses to the E2021 Amplifier Modules on the right and left
hand sides of the Transmitter. Single units requiring power (E2023 and E2026) and both cooling fans
are also supplied from both left and right hand buses. All supplies are switched via a single front panel
safety switch.
Each Power Supply Module has its own forced air cooling, output control and monitoring circuitry and
generates a fixed regulated 48Vdc supply. On the -02 and the -04 to –08 variants, failure of a single
Power Supply Module leaves the transmitter still operating at full output power. In this case, as with
the Amplifier Modules, the faulty Power Supply module can be removed or replaced, within seconds,
whilst the Transmitter is operating at full power. Red/green fault displays, relatively low weight and
small size again feature.
48Vdc outputs for each Amplifier and for all the low power single units are provided via 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.
Mains supplies outputs for one or two Exciters are provided via fuses at the rear of the Transmitter. In
the –01 to –04 variants, two outputs are provided, both derived from the single mains supply to the
Transmitter. In the –05 and –06 variants, two independent supplies are provided, each being derived
separately from one or other of the dual supplies to the Transmitter. On the –07 and –08 variants, a
fused 48V dc output is provided at the rear, for ancillary equipment, in place of one of the mains
supply outputs.
1.1.3 : 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) or rear panel (E2023-03/04) with an
additional TCP/IP monitor/control port on the rear (E2023-02/04 only). In the latter cases, selection of
RS232 or TCP/IP is done by internal links.

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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.
1.1.4 : E2026 Drive Changeover/Output Monitor (and Splitter) Unit
This single unit interfaces between the Exciter(s) and the two E2021 Amplifier Module inputs. The
splitter section within the unit is a two way Wilkinson 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, 50Ωcoax leads then connect these outputs to the E2021 inputs.
This unit also contains circuitry to measure the Transmitter’s final output forward and reverse powers,
via a coupler in the E2029 Combiner, and to measure the temperature of the Combiner’s dumping
load heatsink (see 1.1.5). 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 rear left hand side Bus Board (see section 3.4.2). A front panel
connector is provided to give a harmonically filtered 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.
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 Module on the left hand side of the Transmitter and the other for the Amplifier Module on
the right hand 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
1.1.5 : E2029 Two Way Combiner Unit
This single unit interfaces between the two E2021 Amplifier Module outputs and the antenna. Phase
length matched, 50Ωcoax leads connect the E2021 outputs to the TNC connectors at the bottom rear
of this unit. The combiner section within the unit is a two way Wilkinson, utilising standard
handformable coaxial cable. The combiner section is preceded by integral low pass filters (one for
each E2021) these removing harmonics of the wanted frequency.
An output directional coupler is provided with an N Type 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 1.1.4). The combiner dumping load heatsink is fitted with a
temperature sensor, which is also connected to the E2026 to allow monitoring and over-temperature
warnings.

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1.2 : VARIANTS AND OPTIONS
The main variants and their constituent modules and units are as follows :-
(NOTE that the variant type is identified on the serial number plate – the initial display on the E2023
Controller will display S79005-1 or –2 which only indicates the number of power supply units fitted and
not the variant)
Amplifier
Modules
Power
Supplies
Transmitter
Auto. Cont.
Splitter and
Drive C/O
Combiner
Unit
S79005-01
Single PSU
Single Mains
Input
2 off
E2021-XX
Single
E2088-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-02
Dual PSUs
Single Mains
Input
2 off
E2021-XX
2 off
E2088-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-03
Single PSU
Single Mains
Input
2 off
E2021-XX
Single
E2322-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-04
Dual PSUs
Single Mains
Input
2 off
E2021-XX
2 off
E2322-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-05
Dual PSUs
Dual Mains
Input
2 off
E2021-XX
2 off
E2088-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-06
Dual PSUs
Dual mains
Input
2 off
E2021-XX
2 off
E2322-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-07
Dual PSUs
Dual Mains
Input
48V Output
2 off
E2021-XX
2 off
E2088-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
S79005-08
Dual PSUs
Dual mains
Input
48V Output
2 off
E2021-XX
2 off
E2322-01
Single
E2023-01, 03
or
E2023-02, 04 (/T
Option)
Single
E2026-05
Single
E2029-01
The option (identified by letter suffix) are as follows :-
/T Fitted with TCP/IP Remote Control (on E2023-02 or -04)
Example is as follows :-
S79005-05/T Standard 500W (with dual E2088’s, dual mains supply input and TCP
Remote Control)

Print Date 08/04/14 Page 9 of 34 S79005-00MA-05
1.3 TECHNICAL SPECIFICATIONS
The S7900 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 50Ωnominal
Input Drive Power RF Input from Exciter/Drive supplied :-
8-10W (13W 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 200W to 500W (Power Low setting)
Adjustable at least 300W to 500W (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 –75dBc
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.

Print Date 08/04/14 Page 10 of 34 S79005-00MA-05
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 :- 7U
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 90%, non condensing
with the transmitter at a higher temperature than the ambient.
Altitude (operating) : Up to 3000 metres a.s.l.
Power Supply
-01 , -02, -03 and –
04 single mains
supply variants
Single phase input.
90 to 260V AC, 47- 63Hz.
Apparent power factor 98%.
Efficiency 88% (Power Supply units only)
Supply current at 230V AC typically :-
4A (with 500W RF output)
Supply current at 115V AC typically :-
8A (with 500W RF output)
Typical overall efficiency 55% at above power levels (AC in to RF out)
Power Supply
-05, –06, -07 and
–08 dual mains
supply variants
Each Single phase input.
90 to 260V AC, 47- 63Hz.
Apparent power factor 98%.
Efficiency 88% (Power Supply units only)
Supply current at 230V AC typically :-
2A (with 500W RF output and both mains supplies present)
4A (with 500W RF output and only one mains supply present)
Supply current at 115V AC typically :-
4A (with 500W RF output and both mains supplies present)
8A (with 500W RF output and only one mains supply present)
Typical overall efficiency 55% at above power levels (AC in to RF out)

Print Date 08/04/14 Page 11 of 34 S79005-00MA-05
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 or 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. Note that the two types are not interchangeable.
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
1 6 Way, 16A/440V, free socket with
top entry hood1
(e.g. ‘Contact Connectors’ H-BE
part numbers 10-1910 for insert
and 10.0110+12.9543 for hood)
For connection to lead from mains supply
distribution point.
1
Length
as req’d
3 core, 2.5mm
2
per core, type SY,
flexible steel armoured cable.
Mains supply lead(s).
1
(-01
and-03
variants)
10A ‘C’ rated 2 pole miniature circuit
breaker (MCB).
Fitted at mains supply distribution point to
protect supply lead and mains input components
in the Transmitter.
1
(-02
and-04
variants)
10A ‘D’ rated 2 pole miniature circuit
breaker (MCB).
Fitted at mains supply distribution point to
protect supply lead and mains input components
in the Transmitter.
2
(-05
to -08
variants)
10A ‘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.

Print Date 08/04/14 Page 12 of 34 S79005-00MA-05
Typical
Quantity
Description Function
1 N Type coaxial free plug. For connection to lead from Antenna or RF
output load.
Length
as req’d
Low loss 50ΩRF coaxial cable, rated
in excess of Transmitter output
power at maximum ambient
temperature.
RF output lead.
1 - 3 TNC 50ΩRF coaxial free plug(s). For connection to leads from Exciter/Drive(s)
and their dummy load.
Length
as req’d
Low loss 50ΩRF 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, 50Ωload
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.
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
0.75mm
2
, EPR insulated, HOFR
sheathed for high temperatures).
For fused and switched mains supply
connections to Exciter/Drive(s).
1
(-07 and
–08
variants)
DC supply connector/lead
(Neutrik ‘Speakon’ NL2FC free
connector plus 7x0.2mm (0.22mm
2
)
strand red (+) and black (-) PVC
insulated cable)
For fused and switched +48V DC connection to
ancillary equipment.
8 Screws c/w plastic cup washers and
rack caged nuts.
For fixing Transmitter 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.
3 500mA (F) Fuses (for smd holders,
‘Littelfuse’ R451.500)
For protection of control circuits within E2021
Amplifiers and E2026 Drive Changeover/Output
Monitor Unit.
2 16A (T) HBC 5x32mm (¼ x1¼ in)
Fuses
For protection of internal dc supply leads to and
high current circuitry within E2021 Amplifiers.
3/4 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).
1
(-07 and
–08
variants)
1A (T) HBC 5x20mm Fuse For protection of +48V DC supply to ancillary
equipment.

Print Date 08/04/14 Page 13 of 34 S79005-00MA-05
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 S79005 (i.e. the assembly carrying the Amplifiers, Power Supplies, Controller, Drive
Changeover/Output Monitor and Combiner) is 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 Assemblies 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 7U 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 eight screws, plastic cup washers and caged nuts. The Amplifier
modules, Power Supplies and Fan Assemblies can then be refitted and external connections made.

Print Date 08/04/14 Page 14 of 34 S79005-00MA-05
2.2 EXTERNAL CONECTIONS
2.2.1 Mains Supply Connector (-01, -02, -03, -04 single mains supply variants)
This is a 6 Way plug at the rear of the Supply Disconnector section, CON02. The supply must be
single phase, 90V to 260V AC, 47 - 63Hz.
The maximum current drawn from the supply is in the order of 4A at 230V AC increasing to about 8A
at 115V AC.
! CAUTION !
The mains supply lead to the Transmitter must consist of three core (P+N+protective earth) insulated
cable. Each core must be at least 2.5mm
2
and the overall cable armoured (type SY flexible steel
armoured cable preferred) and not mounted in a conduit with other supply cables. A double pole,
10A (C rated for –01 and –03 variants, D rated for –02 and –04 variants) MCB must be provided
at the supply distribution board 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’ to prevent inadvertent operation of the
Transmitter.
The lead terminates in 6 Way 16A/440V free socket at the Transmitter end, which is wired as follows :-
Pin 1 Line
Pin 2 Neutral
Pin 3 Prot. Earth
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 top 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.

Print Date 08/04/14 Page 15 of 34 S79005-00MA-05
2.2.2 Mains Supply Connector (-05, -06, -07, -08 dual mains supply variants)
This is a 6 Way plug at the rear of the Supply Disconnector section, CON02. Both supplies must be
single phase, 90V to 260V AC, 47 - 63Hz.
The maximum current drawn from each of the two supplies is in the order of 2A at 230V AC increasing
to about 4A at 115V AC. If one of the supplies is absent, the maximum current drawn from the
remaining supply is in the order of 4A at 230V AC increasing to about 8A at 115V AC.
! CAUTION !
The mains supply leads (two total) to the Transmitter must each consist of three core (P+N+protective
earth) insulated cable. Each core must be at least 2.5mm
2
and the overall cable armoured (type SY
flexible steel armoured cable preferred) and not mounted in a conduit with other supply cables.
Two double pole, 10A (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’ to prevent inadvertent operation of the
Transmitter.
Each lead terminates in the 6 Way 16A/440V free socket at the Transmitter end, which is 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 supply or supplies via separate MCBs.
The armouring of the cable should also be taken to ground at the supply distribution board.
The free connector should be fitted with a top 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.

Print Date 08/04/14 Page 16 of 34 S79005-00MA-05
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’.
This is a 50ΩN Type coaxial socket on the E2029 Combiner Unit (at the rear, top middle 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 50ΩTNC coaxial sockets at the centre rear of the E2026 Drive Changeover/Output
Monitor Unit. Socket SK08 (Drive A) is for connection a single Exciter/Drive’s RF Output. When dual
drive changeover is supplied, socket SK06 (Drive B) is used for connection to the second
Exciter/Drive’s RF Output. In this case, socket SK07 (Load) is used for connection a 50ΩExciter/Drive
dummy load, normally situated in the section of the rack where the Exciter/Drives are fitted.
Note also that access to these connectors may require the E2026 to be moved forwards after
removing its two front fixing screws, taking care not to strain any leads connected to its rear.
2.2.5 Safety Interlock Connector
This is a removable, 2 Way, 5.08mm screw terminal block PL12 at the rear of the E2026 Drive
Changeover/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
100Ω. 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 50ΩBNC coaxial socket SK01 on the left-hand side of the E2026 Drive Changeover/Output
Monitor Unit front panel. This provides an harmonically filtered sample of the Transmitter’s forward
output power at a level, into 50Ω, approximately 60dB below the power being delivered into the load
(e.g. approximately 0.5mW for 500W 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 08/04/14 Page 17 of 34 S79005-00MA-05
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 12kΩand must be fed from a voltage
free source of less than 1kΩto 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 10Ω.
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 (standard) or RS232 Serial Remote Control DTE Connector
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 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 (standard) 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. 13W) 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 100Ω. 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 08/04/14 Page 18 of 34 S79005-00MA-05
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 12kΩand must be fed from a voltage free
source of less than 1kΩto 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 one or two standard IEC three pin (L+N+PE) sockets CON01 (except –07 and –08 variants)
and CON03 either side of the mains supply input connector. Each one is connected, via the front
panel SUPPLY DISCONNECTOR switch, to the mains supply input connector. On the dual mains
supplies -05 and –06 variants, CON01 is connected to one supply and CON03 to the other. In this
case, equipment connected to these supply outputs 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, FS5 and FS6, to allow for current surges at ‘switch-on’

Print Date 08/04/14 Page 19 of 34 S79005-00MA-05
2.2.11 RS232 Serial Control and Monitor (COM) Connector
This is a 9 Way D plug PL01 on the right hand side of the E2023 Control Unit front panel. It is used to
enable down loading of status and to enable simple control using a personal computer (PC) directly
connected to this front panel COM port. Multi-core screened cable, not exceeding 30 metres 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 :-
Pin 1 Not connected
Pin 2 Received Data (to E2023)
Pin 3 Transmit Data (from E2023)
Pin 4 Not Connected
Pin 5 Ground
Pin 6 Not Connected
Pin 7 Not Connected
Pin 8 Not Connected
Pin 9 Not Connected
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 that the internal connections to this connector may be re-directed to the rear panel DTE
connector PL04 by the use of an optional internal link lead (see section 2.2.8).
Full details of serial remote control procedures via this connector are given in Section 2.4.
2.2.12 TCP/IP Control and Monitor Connector (/T option only)
This is a standard RJ45 connector SK08 mounted in an additional screened box fitted to the rear of
the E2023-02 or -04 Control Unit. This enables all the control and monitoring detailed in Section 2.4 to
be performed using TCP/IP (Transmission Control/Internet Protocol)
This arrangement requires the unit to be assigned a unique Internet Protocol address. When first
connected to the network via its RJ-45 connector, the E2023’s TCP/IP adapter will attempt to acquire
an IP address automatically (it’s quite common to have networks configured to use ‘DHCP’, which
provides these addresses on demand). The address to which a device has been assigned can then be
determined and, if required, be overridden with a desired fixed value, using Eddystone supplied
software.
Note that internal linking leads determine if control and monitoring is via this connector or the front
panel RS232 COM port connector (both cannot be used together).
2.2.13 FWD/REV Output (Analogue Monitor) Connectors
These are two 50ΩSMC coaxial sockets PL10/11 at the left rear of the E2026 Drive
Changeover/Output Monitor Unit. They provide DC analogue output voltages corresponding to the
Transmitter output forward and reverse powers. Coaxial screened cable, not exceeding 3 metres in
length, should be used for the interconnecting leads.
PL11 provides the forward power indication at a level of approximately 1.5V at 250W to 2V at 500W.
PL10 provides the reverse power indication at a level of approximately 1.4V at 13W.
Both outputs are from impedances of approximately 5kΩ.
2.2.14 +48V DC Output Connector (-07 and –08 variants only)
This is a Neutrik ‘Speakon’ connector CON01, at the bottom left rear of the unit proving a supply of
+48V dc, referred to chassis ground, with a maximum output current of 1A.The supply lead terminates
in a two pin Neutrik ‘Speakon’ type NL2FC free connector with the positive lead wired to ‘1+’ and the
negative (chassis potential) lead to ‘1-‘. This output is protected by a 1A (T) HBC fuse, FS6.

Print Date 08/04/14 Page 20 of 34 S79005-00MA-05
2.3 SETTING UP PROCEDURES
2.3.1 Fuses
If any problems occur after the Transmitter has been installed and switched on, fuses may need to be
checked and possibly replaced. However, a blown or open-circuit resettable fuse would generally
indicate the presence of a fault, which would need correcting.
The type, function and access to fuses is as follows :
Type Function Access
500mA (F) Fuses
(for smd holders,
‘Littelfuse’
R451.500)
One per E2021.
For protection of control circuits
within E2021 Amplifier modules.
If fuse blows, all front panel
displays on just the affected E2021
go out and its power level falls.
Remove Amplifier module from front,
taking care to release the mechanical
securing locks first. Smd fuseholder is at
rear of unit under the screen cover.
500mA (F) Fuse
(for smd holders,
‘Littelfuse’
R451.500)
One only.
For protection of control circuits
within the E2026 Drive Changeover
/Output Monitor Unit
If fuse blows, all front panel
displays on just the E2026 go out
(except DRIVE A/B and
INTERLOCK/EXT MUTE) and the
overall output power level falls to
zero.
Note, if a spare fuse is not
available, one may be transferred
from one of the E2021 modules to
enable operation at lower power.
Slide Drive Changeover/Output Monitor
Unit forwards after removing front fixing
screws and all rear connections.
Remove the top cover.
Smd fuseholder is accessible on the
front printed circuit board, right hand
side.
! CAUTION ! Ensure that the front
panel Supply Disconnector is
switched to ‘OFF’.
16A (T) HBC
5x32mm
(¼ x1¼ in) Fuses
One per E2021.
For protection of internal dc supply
leads to and high current circuitry
within E2021 Amplifier modules.
If fuse blows, all front panel
displays on just the affected E2021
go out and its power level falls to
zero.
At the bottom rear of the Transmitter,
the larger fuse-holders on the left/right
hand sides. Note fuse position mirrors
amplifier position, FS1/2.
! CAUTION ! these are high energy
circuits and thus care must be taken
if replacing the fuse with power on.
6.3A (T) HBC
5x20mm Fuses
Two only.
For protection of internal low
current dc supply leads.
Internal low current supplies are
dual redundant, thus the loss of one
fuse produces no failure (only
E2023 display warning). If both
blow, E2023 and E2026 front panel
displays all go out and the overall
output power level falls.
At the bottom rear of the Transmitter,
the single smaller fuseholders on the left
and right hand sides, FS3/4.
! CAUTION ! these are high energy
circuits and thus care must be taken
if replacing the fuse with power on.
6.3A (T) HBC
5x20mm Fuses
Two only or
one only (FS5) on
–07 and –08
variants
For protection of mains supply
leads and circuitry intended for
connection to Exciter/Drive(s).
At the bottom rear of the Transmitter,
the smaller fuseholders adjacent to the
associated mains output sockets. FS5/6
! CAUTION ! these are high energy
circuits and thus care must be taken
if replacing the fuse with power on.