User Manual

PINEAPPLE TECHNOLOGY, INC. V. THEORY OF OPERATION
DTXPRO-1.2KU OPERATING AND SERVICE MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
V - 6
V -- THEORY OF OPERATION (Continued)
G. DRIVER AND ALC CIRCUITS ARE INCLUDED IN THE DXDPRO-10U Modulator/Driver
(Continued)
2. Command Functions - The three front panel “NO” (momentary) push buttons – POWER UP,
POWER DOWN, SET/RESET – can be remotely operated by a momentary relay closure to ground.
Each operation is internally pulled up to 5 VDC through a 10K resistor. The SET/RESET push
button toggles the DR50UD between manual and track modes. In manual mode the transmitter
power may be raised or lowered by use of the POWER UP or POWER DOWN buttons until the
desired transmitter output power is obtained. Momentarily pressing the SET/RESET push button
toggles the DR50UD into TRACK mode where the ALC board maintains that power level.
H. USH3C 3-WAY SPLITTER
The USH3C 3-Way Phased Splitter receives the output from the DXDPRO-10U and splits it into 3
parts. Two outputs are at 0 degrees phase and the third output is shifter 90 degrees. This unit is an
isolated phased splitter and will provide some isolation in the event one PA fails.
I. UCH2KU-3 MULTICOUPLER COMBINER
The UCH2KU-3 is a 3-Way Phased Multicoupler Combiner. This multicoupler accepts the phased
output power from each of the three (3) PA1K-50 Power Amplifiers and combines them into an output
power level slightly higher than the rated transmitter output power in order to compensate for the filter
insertion loss. This is a closed unit and cannot be serviced.
J. DC5KC-1 DIRECTIONAL COUPLER
The DC5KC-1 Directional Coupler provides for insertion monitoring of forward (FWD) and reflected
(RFLD) RF power after the mask. These monitor signals are sent to the ADP500 for display, operation
of the ALC feature and adaptive pre-correction when the DXD100AU exciter is installed. These
directional couplers also provide sample power to the modulator Adaptive correction circuits.
K. BPUD2.5K ATSC COMPLIANT MASK FILTER
This mask filter was designed to meet FCC Certification requirements with minimum loss of RF Power.
The BPUD2.5k comes tuned and tested to the operating frequency of the transmitter and should not be
adjusted without proper equipment and experience. It is recommended that, should adjustment
become necessary, the filter be returned to the factory.