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)
The DXDPRO-10VH has a built-in ALC circuit. This circuit receives a sample of output transmitter
power and automatically adjusts exciter output power to provide for consistent and constant
power in the output.
Additional information on the functions and applications of the DXDPRO-10VH Exciter can be
found in the transmitter User Manual.
F. VS200N 2-WAY IN-PHASE SPLITTER
The VS200N 2-Way In-Phase Splitter receives the output from the DXDPRO-10VH
Modulator/Driver and splits it into 2 parts. The VS200N is a frequency sensitive assembly and can
only be used on the transmitter channel it was designed for.
G. MFA2PAH-50 POWER AMPLIFIER HOUSING MAINFRAME
The MFA2PAH-50 is the main RF Power Amplifier housing which accommodates up to two (2)
PA1KVH-50 Amplifiers. The housing includes the following:
2 each 470 CFM cooling fans
2 each Air filter assemblies
2 each Front panel status PC boards
1 each Main chassis
2 each Mechanical slide assemblies
1 each 220 VAC Filtered inlet for operating the cooling fans
There is one (1) MFA2PAH-50ND mainframe assembly in the DTXPRO-800VH transmitter rack
for two (2) each PA1KVH-50ND Power Amplifiers.
I. PA1KVH-50 POWER AMPLIFIER
The PA1KVH-50 is the main RF Power Amplifier Assembly used in the DTXPRO-800VH.
Each amplifier assembly is made up of one (1) DX25VH-50 driver amp pallet and two (2)
VHB600A-50 power pallets operating in parallel. These amplifiers are operated in Class A/AB or
sometimes referred to as "HARD AB". This refers to the bias levels to achieve best linearity.
Each PA1KVH-50ND amplifier assembly includes the following:
1 each DX25VH-50 driver amp pallet
2 each VHB600A-50 power pallets
1 each Phase and gain matching circuit