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low state at the 10 Hz rate, respectively. Any of these may be used as a
modulation source, each with its own characteristics.
Both jamming carriers have the ability to be modulated or left in its
unmodulated state by the Carrier Modulation switches (Switches C-2 and
C-4). This is useful when measuring for FCC frequency compliance as an
unmodulated carrier is easier to inject into a frequency counter.
4.5 Jamming Carrier Power and External Control
The presence of the jamming carriers may be controlled in three
manners. The first is individual control by the use of the Carrier On
switches (Switch C-1 and C-3 down for that carrier ON).
The second is with the Master Control Switch (Switch B-2 down for
power to the Carrier ON Switches) . This switch will control any of the
jamming carriers selected for control by the Carrier On switches.
The third manner of control is through the use of the External Control
Switch ( Switch B-1 Down for transfer to the rear panel if the Master
Switch is up) which will transfer the control of any jamming carriers
selected for activation by the Carrier On switches to a jack on the rear
panel of the EE-2002 chassis. Shorting the conductors of the rear panel
jack will activate any selected jamming carriers.
5.0 OPERATIONAL CHECK
Two methods of operational check are available depending upon
equipment availability. The encoded channel should be combined into the
distribution network and a good quality Television Receiver or a Spectrum
Analyzer may be employed to view the encoded and decoded channels
appearance.
5.1 Distortions Within the Decoded Channel
If after placing the decoding filter into the drop path a distortion is
viewable (normally in the form of diagonal bars or stripes) recheck the
level of the jamming carriers relative to the visual carrier . If the levels are
correct you may assume that the distortion is occurring within the
modulator.
This distortion is normally due to the additional energy presented to the
output mixer of the modulator due to the addition of the jamming carriers.
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