Section 2 - Transmitter Functions; Transmitter Control Panel; Frequency Select; Output Current Select - SPX Radiodetection PCM+ Operation Manual

Section 2 – Transmitter Functions
The PCM TX is a powerful transmitter, capable of
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sending detectable signals up to 30km (20 miles) from
the connection point.
The PCM Transmitter is housed in a rugged waterproof
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case. To open the transmitter, unsnap the clips located
either side of the handle. In certain situations, the air
pressure within the case may need to be equalized by
unscrewing the small knob located by the handle.
The case must remain open during operation; this allows
the transmitter to remain at optimal temperature.
Before closing the case, disconnect all cables and keep
them away from the heat sink and the support strut.

2.1 Transmitter Control Panel

1. On/Off switch
2. LCD and LED indicators. Indicates the current
output in amps and provides critical feedback
on the TX's operation
3. AC Input socket
4. DC Input socket
5. Output lead socket
6. Output Level Selector: Select the output level
in amps
7. Frequency Selector: Selects the frequency
8. Serial Port: For service personnel only
9. Heat sink: Vents heat from the transmitter
during operation

Figure 2.1: Tx Facia

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6 2 7

2.2 Frequency Select

The LCD displays the selected 4Hz output current in
amps.
The three-position rotary
switch selects the applied
mapping frequencies as
follows:
ELF Transmission Lines
ELF maximum range.
• 35% 4Hz
• 65% ELF (128Hz or
98Hz)
ELCD Transmission and Distribution Lines
ELF current direction, medium range.
• 35% 4Hz
• 30% 8Hz (current direction)
• 35% ELF (128Hz or 98Hz)
LFCD Distribution Lines
LF current direction, alternative frequency.
• 35% 4Hz
• 30% 8Hz (current direction)
• 35% LF (640Hz or 512Hz)
The 4Hz mapping frequency is always present.
The operator has a choice of selecting the locate
frequency and current direction indication if required for
identification in congested areas or for faultfinding.
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2.3 Output Current Select

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This rotary switch allows users to select six different 4Hz
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current settings. These are 100mA, 300mA, 600mA, 1A,
2A and 3A.
When the PCM
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current will remain at a constant level, unless input power
supply limit is reached.
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Figure 2.2: Frequency Selector

transmitter is in operation, the selected
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PCM Operation Manual 3
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