SGC SG-2020 TEST DOCUMENT, Installation And Operation Manual

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© 1998 SGC Inc
5.4 AM RECEPTION FOR BROADCAST
AND SHORTWAVE
Reception of AM broadcast and shortwave stations is very effec-
tive by using upper sideband or lower sideband. Choice of either
sideband will allow the user to avoid nearby interfering signals.
For additional information concerning the SG-2020’s broadcast fil-
ter and how to bypass it for broadcast reception in the 400 to 1600
kHz range, see section 15.1.
6.0 INSTALLATION
6.0.1 EQUIPMENT LOCATION
The SG-2020 can be affected by strong nearby magnetic fields.
Therefore, be sure to place any AC supply or other source of
strong magnetic fields at least several inches away from the trans-
c e i v e r. Additionally, it is of good practice to avoid locating the
unit on top of heat generating devices such as linear amplifiers.
6.0.2 ANTENNA CONSIDERATIONS
Successful operation of any station depends on providing a reason-
ably efficient and well matched antenna system. The SG-2020
expects a 50 ohm resistive impedance at the operating frequency.
The output load conditions are monitored by the SG-2020 to pro-
vide protection for the final amplifier’s output transistors by auto-
matically reducing power output when an impedance mismatch is
detected.
Despite this protection, the transmitter should never be activated
unless an antenna or dummy load is connected to the RF connector
located on the rear panel. Use 50 ohm coaxial cable with a proper
PL-259 plug to connect the transceiver to the antenna load. If the
SWR is too high to permit the desired performance, re-configure
your antenna system to include an automatic antenna tuner such as
the SG-231 or SG-230 between the transceiver and the antenna.
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