User manual

1.4.5 POWER CONNECTOR
The Guardian is supplied with a right-angle power connector (10-30 VDC). The table below shows the pin-out of the
power connector.
Figure 4 Power Connector
Table 5 Pin-Out of the Power Connector
Contact number
(Left to Right)
Color
Description
4 Fan Power Output (5V)
3 Black Ground
2
Red
Positive (10-30) VDC
1 White Enable — See Note
Note: The white Enable line must be tied to the red positive lead of the connector for the Guardian to power up.
Bringing the Enable line low is a request for the unit to power down. If the unit is writing to any non-volatile memory, it
will complete the operation before powering down. It is highly recommended that you use the Enable line to power up
and power down the radio.
1.4.6 ANTENNA CONNECTOR
The standard Guardian has a 50-Ohm TNC female antenna connector. This connection functions for both transmit and
receive.
Warning: See 2.5 Selecting Antenna and Lightning Arrestor Combinations for information about types of lightning
arrestors to not use and good design practices to use when selecting a lightning arrestor for use with an antenna.
The Dual-Port and Full-Duplex Guardian have a 50-Ohm TNC female antenna connector functioning for transmit (only)
and a 50-Ohm SMA female antenna connector functioning for receive (only). The separate receive antenna connector
allows for unique customer applications that require additional receive filtering, external PA(s), and other options.
Warning: The transmit antenna port must not be connected directly to the receive antenna port of the Dual Port or
Full Duplex Guardian. Excessive power into the receive antenna port will damage the radio. Input power to the
receiver should not exceed 17 dBm (50 mW).
To reduce potential interference, the antenna type and its gain should be chosen to ensure the effective isotropic
radiated power (EIRP) is not more than required for successful communication.
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 6