Harris Z3-48HD+, Техническое руководство

Страница: 24 / 38

1-12 888-2621-001 12/5/07
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
In this system, the HDx-FM Exciter's AUX output is used to drive the BoostPro boost
amplifier(s) in the other TX cabinet. Phase of this drive will be shifted within the
BoostPro and there are Phase adjustments in the BoostPro. If there is a phase delay
beyond what these two adjustments can compensate for, some line length adjustment
may be necessary for proper transmitter output phasing. See Z16 manual for more
information. As discussed earlier, W901A and W901B length can be changed or BNC
elbow adapters can be removed or added inline.
!
CAUTION:
CARE SHOULD BE TAKEN NEVER TO REPLACE THESE CABLES WITH AN
UNKNOWN CABLE, POSSIBLY CAUSING FULL COMBINED TRANSMITTER
POWER OUTPUT TO GO TO A COMBINER REJECT LOAD ONLY DESIGNED
TO CARRY QUARTER TOTAL POWER.
1.3.7 HDx-FM Exciter/BoostPro Control
The Forward Power sample of each RF source is routed directly to the transmitter
controlling each RF source(s). The transmitter will use these samples to determine if
there is an RF source failure. The sample(s) are also used to display power on the LCD
display screen.
Mute and Active signals for the Flexstar exciter(s) are exclusively controlled by
transmitter C and come from the Life Support Board. The active signal is used for the
exciters to know which one should be the on air exciter and is determined from the
display inputs, input signals, and internal logic. A high on the active line indicates
exciter 1 should be the on air exciter. If the active line is pulled low, exciter 2 will now
be the on air exciter. The mute signal routed to the exciter(s) turns off the main RF
output only as dictated by the exciter setup for this Z3-48 system. The auxiliary output
remains on at all times to provide drive to the other parts of the system, specifically
transmitter A and B.