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

VII -- DTXPRO-800VH THEORY OF OPERATION (Continued)

1 each 2-Way in-phase splitter

1 each 2-Way in-phase combiner

1 each Circulator

1 each Power distribution module (1A0025)

3 each Thermal sensors

1 each Remote monitor port (DB9)

1 each Front panel status port (Molex)

1 each Filtered DC input port

1 each Type N Panel mounted RF Input port

1 each 7-16 DIN Panel mounted RF Output port

J. VHC1KW IN-PHASE COMBINER

The VHC1KW is a 2-Way In-Phase Combiner. This combiner accepts the output power from

each of the two (2) PA1KVH-50ND 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 generally does not require servicing.

K. DC2KB-2 DIRECTIONAL COUPLER

There are two (2) DC2KB-2 Directional Coupler provided with this transmitter. One directional

coupler (DC) is placed before (pre) the mask filter and one is placed after (post) the mask filter.

1. The pre directional coupler has four monitor probes of which two are used by the

transmitter. One probe monitors the forward power which is sent by RG-223 cable to the

back of the modulator and used for non-linear correction. The other DC probe monitors the

reflected transmitter power and is also sent to the back of the modulator by RG-223 cable.

This provides a HIGH ANTENNA VSWR MONITOR in the event of an antenna or antenna

transmission line failure. Should the reflected power exceed 25% the transmitter will shut

down.