SGC SG-2020 TEST DOCUMENT, Installation And Operation Manual

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© 1998 SGC Inc
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tions as appropriate. The DC cable should be connected directly to
the vehicle battery, rather than to the ignition or accessory circuit-
ry. Route the cable as far away from the ignition wiring and other
cables as possible. Keep the length of this cable as short as possi-
ble to minimize voltage drop losses.
• Do not plug in the DC power cable to the transceiver until the
proper connections are made to the battery; by convention, we rec-
ommend a RED cable lead to the POSITIVE battery terminal, and
a BLACK cable lead to the NEGATIVE battery terminal. Do not
rely on the vehicle chassis to provide the DC negative return path.
Make sure the battery terminal connections are tight and remember
to check them periodically to assure they remain tight and corro-
sion free.
• Measure the voltage across the battery terminal with the engine
running fast enough to show a charge. This voltage cannot exceed
18 Volts DC as that is the maximum allowable DC Voltage for the
SG-2020.
• Measure the voltage at the transceiver end of the cable and con-
firm that the proper voltage and polarity exist for the SG-2020.
The center position of the 3 contact connector is POSITIVE while
the left contact (facing the rear of the radio) provides the NEGA-
TIVE connection to the radio.
• Insert the DC power cable connector into the mating connector
on the rear panel of the SG-2020, connect antenna coax to the
ANTENNA connector, and external speaker connection via the 3.5
mm stereo phone jack if desired.
6.2.2 ANTENNA CONNECTION
Please take a moment to review the base station antenna informa-
tion in the previous section of this manual. An antenna tuner such
as the SG-231 or SG-230 is particularly desirable in a mobile
installation as short antennas typical of mobile installations usually
provide a hostile load impedance to any HF transceiver. Even if
the antenna is resonant near the operating frequency, the bandwidth
of such antennas is extremely narrow limiting operating frequency
agility.
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: sgc@sgcworld.com Web site: http://www.sgcworld.com