User's Manual

PINEAPPLE TECHNOLOGY, INC VII. DTXPRO-800VH THEORY OF OPERATION
DTXPRO-800VH OPERATING AND SERVICE MANUAL
THE INFORMATION PROVIDED HEREIN IS PINEAPPLE TECHNOLOGY INCORPORATED PROPRIETARY INFORMATION AND
CANNOT BE COPIED OR DISTRIBUTED WITHOUT PRIOR AUTHORIZATION
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VII - DTXPRO-800VH THEORY OF OPERATION (Continued)
2. The post directional coupler also has four monitor probes of which two are used by the
transmitter. One probe monitors forward power and is sent by RG-223 cable to the back of
the modulator and used for linear correction. The other DC probe monitors the transmitter
forward output power and is also sent to the back of the modulator by RG-223 cable.
Monitors FORWARD POWER to the antenna and presents it as a percentage of power
rating. The transmitter comes set to 25% Forward Power and the customers engineer
turns the power up to 100% for 800W RMS transmitter output power after the mask filter.
The remaining spare DC probe positions are available for customer use.
L. BPVD1KH VHF ATSC COMPLIANT MASK FILTER
This mask filter was designed to meet FCC Certification requirements with minimum loss of RF
Power. The BPVD1KH 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.