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Table 3. Current Consumption vs Input Power and Duty Cycle
Voltage (V)
RF Power Out (W)
12
12
12
12
13.8
13.8
13.8
13.8
3.5
Grounding Considerations
To minimize the chance of damage to the transceiver and connected equipment, a safety ground (NEC
Class 2 compliant) is recommended which bonds the antenna system, transceiver, power supply, and
connected data equipment to a single-point ground, keeping all ground leads as short as possible.
Normally, the transceiver is adequately grounded if the supplied flat mounting brackets are used to mount
the radio to a well-grounded metal surface. If the transceiver is not mounted to a grounded surface, it is
recommended that a safety ground wire be attached to one of the mounting brackets or a screw on the
transceiver's case.
The use of a lightning protector is recommended where the antenna cable enters the building; bond the
protector to the tower ground, if possible. All grounds and cabling must comply with applicable codes and
regulations.
3.6
Data Interface (DB-25)
The Data Interface has several ports integrated into one connector: Ethernet, COM1 and COM2 Serial
Ports, and GPS signaling.
MDS 05-6906A01, Rev. R
Duty Cycle (%)
0 (RX)
0
2
100
10
30
25
30
0 (RX)
0
2
100
10
30
25
30
Figure 7. COM Connector (DB-25F)
TD220MAX Technical Manual
Current Required (A)
0.3
1.4
3.6
6.3
0.3
1.2
3.2
5.5
As viewed from outside the unit
Thermal
Dissipation (W)
3.6
14
14
15
4
14
14
15
7
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