Ciro Mazzoni LOOP ANTENNA MIDI - Page 20

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 press ENTER to confirm
Now we are ready to operate with
LOOP ANTENNA
 press * and the display shows: Set Frequency
 digit on the keyboard 7050 and press ENTER
 the ATU turns on the RED L.E.D. and after turns on the BLUE L.E.D. when
the motor starts moving
 after 5 second the motor stops and the ATU display shows the S.W.R.
value
TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
Motor doesn’t work
1. the cable from
antenna to ATU is
damaged or not
connected
2. the motor cable is
inverted
1. check or replace
the cable
2. reverse the motor
cable on the rear of
the ATU
ATU doesn’t turn on
1. power supply is
faulty
2. problem with the
220V AC socket
1. replace power
supply
2. use another socket
Keyboard doesn’t
type any key
1. keyboard is
damaged
2. the keyboard may
not be connected
to the ATU
1. replace the
keyboard
2. connect the
keyboard to the
ATU
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ATU doesn’t find
antenna type in
AUTO DETECT mode
ATU doesn’t find
antenna type in
AUTO DETECT mode
1. the coaxial cable is
short-circuited
2. the coaxial
connectors aren’t
grounded
3. there are some
metallic structures
too close to the
antenna
4. the antenna is too
close to the ground
5. the antenna is too
high above the
ground
6. the motor cable
doesn’t work
1. check the cable
2. check the
connector on the
cable
3. reposition the
antenna
4. reposition the
antenna
5. reposition the
antenna
6. check or replace
the cable
S.W.R. is too high on
low bands
1. the coaxial cable is
short-circuited
2. the coaxial
connectors aren’t
grounded
3. there are some
metallic structures
too close to the
antenna
4. the antenna is too
high above the
ground
1. check the cable
2. check the
connector on the
cable
3. reposition the
antenna
4. lower the antenna
(the right height
from a flat surface
is 1.5m)
S.W.R. is too high on
high bands
1. the coaxial cable is
in short-circuited
2. the coaxial
connectors aren’t
grounded
1. check the cable
2. check the
connector on the
cable