When an undesired signal is received at the same frequency as the
desired one, it is not possible to remove the interference with
conventional filtering techniques without also destroying the desired
signal. In this case, phase cancellation techniques are the solution.
The phasing method of interference suppression removes the interference
without removing desired information transmitted at the same frequency.
This is accomplished by matching the magnitude and inverting the
phase 180°. The vector resultant is zero causing full cancellation
of the undesired signal.
Co-channel interference is the result of simultaneous reception
of two different transmissions at the same TV channel frequency,
but with different programs. This problem is solved by sampling
the undesired signal with a test antenna. The sample signal is injected
into the 2903 phase canceller and fed back into the main feed with
a directional coupler. After adjustment of the 2903 phase canceller
the undesired signal is eliminated.
Note: If you were unable to find a filter product that meets your
requirements
please call our Technical Staff for assistance.
