Hal Communications ST-6000, Инструкция по эксплуатации

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3-11
idea to first check the outlet wiring with a multimeter before plugging-in the unit. If a three-prong
AC outlet is not available, use a three to two-prong adapter at the wall socket and connect a sepa-
rate ground lead between the adapter ground lead or ST-6000 cabinet and a good ground. When
using 210 to 250 VAC power mains, be sure to connect the cabinet to a good safety ground. OP-
ERATION OF THIS EQUIPMENT WITHOUT AN ADEQUATE SAFETY GROUND INVALIDATES THE
WARRANTY.
When the ST-6000 is used in a radio communications system that includes a high-powered
transmitter, a short length of low-inductance wire (1/4" wide shield braid is recommended) should
be used to interconnect all equipment cabinets, including the ST-6000 and all teleprinters, etc.
Lack of a good RF ground connection may cause false triggering of the logic in the control sections
or other improper operations. Open-wire antenna feedline systems with high standing-wave-ratios
can be particularly troublesome to solid state equipment. In such cases, changing the antenna,
matching system, and/or feedline to a matched coaxial line system will usually clear-up RF interfer-
ence. When good RF grounds and low SWR feed-lines are used, the ST-6000 will work with even
very high powered transmitter systems.
3.3. Alternate Connections to the ST-6000
In order to achieve maximum interfacing flexibility, a great number of the ST-6000 signal and
control lines are brought out to rear panel connections. The most common connections are repre-
sented by the factory prepared cables and jumpers. When these connections are used, the ST-
6000 will function in a manner similar to that of the previous model ST-5 demodulator (with the
addition of the extra features of the ST-6000). A number of additional I/O connections, such as
use of an external loop supply, full duplex operation, and connection to a UART data conditioning
device can be accommodated by making additional cables and/or changing the jumpers on the
AUXILIARY connector. Spare connector pins and shells are provided for these connections. Follow
the instructions in Figure 3.4 when preparing the connectors. Be sure that the wire and pin are in-
serted in the correct connector shell location. If it is necessary to remove the pin from the shell, a
special tool, Molex® part number HT-2038, can generally be obtained at an electronics supply
store.
Figure 3.4 Preparation of the ST-6000 Connections