13
Symptom
Possible Fault
POWER ON LED
Check AC power source, polarity and power line connections.
does not light.
Check for proper seating of plug in DC power jack
Unit comes on, but
Check all antenna connections on rear panel. Make sure
no signals heard
cables go to correct connectors in Receiver
Noise received cannot
Received noise may not be locally generated. Follow nulling
be nulled
instructions carefully. Make sure you try both settings of PHASE
RANGE switch and the FREQ RANGE switch when nulling if
difficulty is noted. If frequency is above 20 MHz, set the FREQ
RANGE switch to the HI position. NOISE GAIN control may be set
too high initially. The noise antenna length may be too great,
particularly if the noise is severe. Shorten the noise antenna length
until a satisfactory null can be obtained with the NOISE GAIN
control in its mid range. Change the noise antenna
polarization (horizontal or vertical) to agree with that of the main
station antenna. If you can approximate the location of the noise
source, place a short external noise antenna as close to the source
as you can, or use a short dipole facing toward the noise source as
a noise antenna.
NOTE: The short wire noise
antennas supplied with the unit are not adequate to cancel
local power line noise or other noise generated outside the
home. You will need to install an outside antenna. See
Section 3, NOISE ANTENNA for suggestions on antenna size
and location.
If problem persists, contact Timewave Customer
Service Department.
Noise received on noise antenna is too low. Noise received on noise
antenna is different from that received by main antenna. To determine
if this is the case, perform the following procedure:
(1) Connect up the unit as described in the manual. Turn the unit
power on.
(2) Turn both the NOISE PHASE and NOISE GAIN controls fully
CCW.
(3) Now with the main antenna connected, note the S meter reading
and listen to the character of the noise (is it a "buzz" or a "crackle",
etc.?)
(4) Disconnect the main antenna from the ANC-4.
(5) Turn the NOISE GAIN control CW until it is somewhere in its
mid-range and observe the S meter reading. Is it as high as the
reading obtained in step 3? Is the character of the noise the same as
that heard in step 3? If the answer to both questions is "YES", you
SECTION 7
TROUBLE-
SHOOTING
Noise received cannot
be nulled.
