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 50
Ω
N 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 50
Ω
TNC 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 50
Ω
Exciter/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
100
Ω
. 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
Ω
BNC 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 50
Ω
, 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.
