418 Users manual
Release 1.00 – NOVEMBER, 2011
Part #74468
Printed in USA
6
2. 418 FRONT PANEL
This section of your 418 Manual will discuss
the front panel operations and adjustments.
2.1.
SWITCHES
On Off power switch
Used to turn on the amplifier. When in the off
amplifier is in bypass mode. If a fault occurs
the power switch must be cycled to clear
fault.
Ant 1 Ant 2
This switch selects either Antenna 1 or
Antenna 2. The 6 Meter antenna is always
selected when the amplifier is on 6 Meters
2.2.
Band Buttons
Are for manual selection of one of the 11
bands. In automatic or manual mode the
amplifier will light the button of the band
selected.
2.3.
Attenuator Button
This button is used to reduce the input power
to the amplifier when 5 watts or less can not
be supplied. When selected the button will
light and will show either 0,2,4 or 6 db of
attenuation on the display directly above the
button. To determine the value of attenuation,
this formula can be used.
Input power x db multiplier = 5 watts.
db multiplier
2 .625
4 .400
6 .250
Example RF = 20 watts attenuator = 6 db
20 x .250 = 5 watts
The ATTENUATOR button can used to
lower the output power of the 418 when less
than 100 watt output is desired.
2.4.
Delay Button
The delay button delays the transmit to
receive transition to keep the amplifier in
transmit mode. The amount of delay can be
seen directly above the button on the display.
Each press of the DLY button will increase
the delay. To decrease delay press and hold
DLY button for 3 seconds. The up arrow will
turn off and the down arrow will turn on.
Each press of the DLY button will decrease
the delay.
2.5.
Delta Button
When the delta button is pressed and lit the
amplifier looks for data coming in on the
ACC 1 connector. If there is no data the
amplifier will use the internal frequency
counter to select the band of operation. To
use the internal frequency counter. Key
amplifier with at least 200milliwatts input and
release the key and the 418 will select the
band of operation.
2.6.
Leds
The TX led will light to show when the
amplifier is in transmit mode. Another led
mounted in the logo will light when the
output power reaches approximately 80 watts.
2.7.
Display
Visible on the display is a 10 to 100 watt bar
graph for forward power, and a 1 to 3 SWR
bar graph. Ic is Also shown. This is the
current of the mosfet finals, and TEMP,
which is the temperature of the heat sink. Not
always seen are the words OVERDRIVE,
RFD, and FAULT. More on this in section 5.
2.8.
Backlight
The lcd has 6 leds to back light the display.
2 red 2 blue 2 green. To backlight
adjustment, press and hold 80 Meter button
on turn on. Pressing the 160 Meter button will
increase the red intensity, pressing the 40
Meter button will decrease the red intensity.
Pressing the 80 Meter button will increase the
blue intensity, and pressing the 30 Meter will
decrease the blue intensity. Pressing the 60
Meter button will increase the green intensity,
and pressing the 20 Meter button will
decrease the green intensity. Pressing the 15
Meter button will increase the overall
brightness of the display, and pressing the 6
Meter button will decrease the overall
brightness. Cycling the power switch will set
the amplifier to normal operation and save
backlight settings.
