Onwa Marine Electronics KC-480 - Manual (Page 6)

BAND UP/DOWN KEY:
Selects change the band. press the band will increase,
press the band will decrease.
SCAN KEY:
stop the scan function or autostop when an enough
Initialize the channel scan function by pressing the SCAN key
and channel up or down key, pressing the SCAN key again to
signal strength.
GAIN CONTROL KNOB:
Adjust RF gain (eceiver sensitivity) of the transceiver in
variations. In fully clockwise position, the receiver section
prvides maximum sensitivity so that it can pick up weak
signals. Normally this switch should be placed in this position
In Fully counter - clockw ise position, the receiver sensitivity is
minimum, and the receiver will pick up only the strong signals.
causing overload in receiving sound.
SQUELCH CONTROL KNOB:
Used to eliminate any annoying background noise when on
signals are present. The degree of sensitivity to incoming
signals is adjustable. When the squelch control is rotated to the
fully clockwise position, it provides minimum squelch.
AF VOLUME/POWER ON-OFF KNOB:
Likewise, turn the knob counter-clockwise to lower the volume.
Power is switched off by turning the knob counter - clockwise
Power is applied by turning the knob clockwise. To increase
the volume, continue to turn the knob in the same direction.
until it on longer turns.
May be used when receving stong (close) signal which are
Centre antenna in middle of selected location ( i.e, boot, gutter
or roof ).
Install an antenna cable line away from noise sources ( ignition
system, gauges, etc. ) .
Be sure to mount antenna with a good metal to-metal ground.
Prevent antenna cable damage.
About SWR
SWR Reading Output Power Transmitted
100
58.0
89.0
8.3
96.0
93.3
75.0
64.0
49.0
Antenna performance may be peaked by slightly adjusting its
length ( 1/8"to1/4") using an SWR standing wave ratio meter.
This meter is purchased separately or the SWR can be checked
professionally. Most antennas are factory-tuned, but this adjustment
may improve antenna efficiency. An SWR reading below 3:1 is
SWR of 2:1 or below is good , 2.5 or even 3 is usually not user
noticeable or significant.
desired, as this indicates that over 75 of the transmit power is
transceiver and dissipated as harmless as heat. See chart below. An
broadcast into the air. The rest is reflected back into your
1:1
1.3:1
1.5:1
1.7:1
2:1
3:1
4:1
5:1
6:1