588 manual
Second release – August 2007
35
Part #74409
Printed in USA
indicates that your current settings have
been stored in flash memory. This is to
ensure when the transceiver is powered off
that settings have been saved and will be
retained when the transceiver is next turned
on.
TROUBLESHOOTING
While we cannot cover every possible
problem, here are some hints for dealing
with some potential difficulties. Check the
obvious. Is your dc power source okay?
Check power supply, cable and
connector(s). Is the 25 ampere fuse loose or
missing? Antenna problems? Try a dummy
load. Is a proper antenna connected?
Is any external antenna switch connected
and properly set? Have you checked OMNI-
VII’s control settings? Have you double-
checked OMNI-VII’s many control settings,
including those in the menu, for your
intended mode of operation?
Problem: No audio from receiver
Is the AUDIO (AF) turned up?
Is RF GAIN turned down (receiver will mute,
and S-meter will read a higher value than
band noise).
Is squelch activated? SQL will appear in
block letters on the screen. Press the
MULTI encoder to cycle through available
choices and check SQUELCH level.
Is the speaker wire internal to the rig broken
or disconnected? (have you pulled the
covers off recently?) Try headphones to see
if audio returns.
Is NR off? Under some circumstances,
noise reduction can cover band noise
completely, leading the user to think no
audio is coming from the speaker.
Problem: Distorted SSB transmit
Be certain the mic gain is set properly. The
ALC LED should flash on voice peaks, but
not remain continuously lit in SSB modes.
Check the setting of the speech processor.
An excessively high setting can reduce
audio quality.
A frequent cause of a distorted SSB signal is
inadequate RF grounding resulting in RF
feedback. Common RF grounding problems
are no ground connection, or too long a lead
to a good ground. Many problems relate to
the lack of an RF station ground, as
contrasted with a safety ground connection.
We recommend bonding all equipment
chassis together with short heavy metal
braid or strap. Make these connections from
chassis ground lug to chassis ground lug
and connect the last piece in the chain
feeding the antenna to a good earth ground.
This lead needs to be as short as possible.
Lengths near ¼ wavelength on any band
used can be particularly troublesome when
the far end is connected to earth.
Another potential cause of distorted SSB
arises when the station is in the near field of
the antenna. This is a problem many
apartment dwellers face.
Distorted SSB transmit can result from
chassis ground and signal ground from the
microphone being tied together to a
common connection. This is a common
problem with third-party microphones.
Assure the chassis ground and signal
ground from the microphone are separated.
Problem: Transceiver power
shuts off while transmitting
OMNI-VII is equipped with a silicon
controlled rectifier that opens if current draw
from the 13.8 Vdc power supply exceeds 25
amps. This SCR will shut off power to the
transceiver. Excessive current draw can
indicate a problem with excessive SWR due
to antenna or feedline problems. Power to
the radio can be restored by cycling the
power switch and off or the 13.8 Vdc source
on and off.
Problem: No transmit, receive
OK.
Check in the menu to assure
TRANSMITTER is set to ON.
If KEYING LOOP is set to ON in the menu
and the keying loop is either not in use or is
making a faulty connection through
