User`s manual

SGC SG-500 SmartPowerCube™ User’s Manual, Page 8
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SGC RESERVES THE RIGHT TO CHANGE SPECIFICATIONS WITHOUT NOTICE
 Copyright SGC 2007
may occur during normal operation as the temperature of the amplifier rises.
KEEP IT COOL: To avoid a high temperature condition, ensure adequate airflow around
the unit. Keep the cooling fins unobstructed, and do not stack other station components on
the SG-500. If the optional fan is installed, ensure it is plugged in and operating. Also
check the VSWR of the antenna system since a high VSWR increases the heat dissipation
by the amplifier, causing faster temperature rise.
ATTN – This LED indicates the input attenuator circuit is engaged. As input RF power level
increases beyond 60-70 Watts, the attenuation increases automatically. The attenuator remains
engaged until the input drops to 30 Watts. If this happens, reduce exciter output power slightly.
The LED may flash during voice peaks in SSB mode. LOW DRIVE FOR MAX POWER: An
illuminated ATTEN LED does not necessarily indicate the amplifier has tripped, or that a faulty
condition exists. The SG-500 is designed to be driven to maximum output across either a low
(10-60 W) or high (60-150W) input range. This is convenient for transceivers without
continuously adjustable output power control. Maximum efficiency occurs when the SG-500 is
driven across the “low” input range, just below the point where the attenuator circuit is activated.
ALC – ALC control provides adjustable ALC feedback voltage available via pin #3 (ALC) of the
ACCESS connector. This provides a positive ALC voltage range of approximately 1-5 VDC and
should not be used with transceivers utilizing negative ALC control.
BAND FILTER SELECT – These LEDs indicate which of the input band-pass filters are active,
as selected via manual or automatic control.
BAND 1 LED is on when the 1.6 – 2.2 MHz filter is selected
BAND 2 LED is on when the 2.2 – 4.2 MHz filter is selected
BAND 3 LED is on when the 4.2 – 7.7 MHz filter is selected
BAND 4 LED is on when the 7.7 – 13.2 MHz filter is selected
BAND 5 LED is on when the 13.2 – 23.3 MHz filter is selected
BAND 6 LED is on when the 23.3 – 30 MHz filter is selected
*Note – BAND 6 selection is disabled on US/Domestic version amplifiers. Licensed amateur and
commercial station operators may restore full coverage by following the procedure outlined in section 7.5
of this manual.
6.6 ACCESS Connector
Inserted into the ACCESS connector is the supplied 10 pin vertical plug which permits interfacing to
certain amplifier functions. Below this is a three pin horizontal connector controls the optional cooling
fan unit (SGC part number #51-82)
Access connector pins (from top to bottom) are described below:
14 VDC – switched 14 VDC via the ON/OFF switch is present on this line (maximum 5A). Not to be
used for powering station components drawing greater than 5A.
GND – Chassis ground for control purposes available on this line.