Timewave ANC-4 Instruction Manual page 18

should be able to arrive at a satisfactory null of the noise. (Hint: When you
reach the same S meter reading as before, leave the GAIN where it is,
reconnect the main antenna and try to null with just the NOISE PHASE
control. You may have to alternate between PHASE and GAIN a few times
to get the deepest null.) If the answer to either question is "NO", then a null
probably cannot be achieved.
(6) If the noise sounds the same in steps 3 and 5, but you can't get a high
enough S meter reading from the noise antenna alone, you need a longer
noise antenna or need to locate the noise antenna closer to the noise source.
(7) If you can get a similar S meter reading, but the noise sounds different in
step 5 from what it sounds like in step 3, your noise antenna is picking up
noise that is not being heard by the main antenna and the noise antenna must
be relocated so that it DOES pick up the noise appearing on the main antenna.
(For instance, your outside antenna may be receiving noise from power lines,
while the indoor noise antenna may be picking up noise from a nearby
computer, noise which is not heard by your main antenna). In most cases, a
simple short dipole can be placed outside in shrubs or some other low area,
but in view of the noise source, if possible. The noise antenna is then fed to
the ANC-4 NOISE ANTENNA jack (rear of the unit) with shielded wire.
Repeating the above tests will let you determine if you will be able to null the
main antenna noise or not. Some adjustment of noise antenna length or
position may improve the null.
14