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H.
Adjust phase control for a null or minimum signal.
I.
Adjust the balance for lowest reading
J.
Change PHASE NORM-INV to opposite position. The signal should now be strong.
Note:
Any signal being nulled or peaked
must
be adjusted to the same level as seen at the receiver
from both channels or the
NCC-1
Phase Control will not work as expected.
Technical Description
Voltages for phase adjustment are linearized through an active feedback system. Phase adjustment
is spread over a wide linear control range. This gives the phase control a smooth feel and improves
the ability to manually reset it.
The
NCC-1
uses two exceptionally flat-response phasing bridge systems and a unique system of
mirrored bridges in each channel. When phase delay is increased in one channel, phase delay is
simultaneously decreased in the other channel. Any level changes while adjusting phase are
automatically compensated in the other channel. There is virtually no channel balance error over the
entire range of the phase control.
The
NCC-1
has a dynamic range up to 30 dB (1000 times) better than other popular noise canceling
systems. It also has provisions for further improvements in exceptionally strong signal
environments. The
NCC-1
has four filter slots for optional high pass and band-pass filters. Filters
remove undesired signals before reaching any active devices, greatly increasing dynamic range in
extreme RF environments.
Note:
Effective and proper operation occurs only when the
same
noise (for nulling noise) or
the same desired signal (for signal enhancement) is present on both A and B INPUTs.
