System Description

835A 4 kW, 5 kW or 6 kW UHF Transmitter System Description
- Page 4 of 4 - November 7, 2002
Main AC Input - Continued
The 208/240 VAC Input to the UHF Exciter Assembly connects to (A8) the AC Distribution Assembly, UHF Exciter
Assembly (1245-1500) located in the right, center rear of the Cabinet. The Assembly contains the Terminal Block (TB1) to
which the 208/240 VAC connects. Line 1 to TB1-1, Line 2 to TB1-3 and Safety Ground to TB1-2. The AC Distribution
Assembly contains (CB1) the Main Circuit Breaker (20 Amps) that supplies the AC to the rest of the Single Exciter Assembly.
The output of CB1 has three MOVs, VR1, VR2 and VR3, connected to it, one connected from each Line of the Input AC to
ground and one across the two lines. The AC output of CB1 is wired to A1 and A2 which are IEC Outlet Strips. The (A1)
Exciter and the (A4) Variable Phase/Gain Tray plug into the (A1) IEC Outlet Strip. The (A5) Variable Phase/Gain Tray, the
(A6) Metering Panel and the (Optional) (A7) Receiver Tray plug into the (A2) IEC Outlet Strip.
When the Circuit Breaker CB1 on the Single UHF Exciter Assembly is switched On, +12 VDC from the Exciter is supplied to
each of the Amplifier Array Cabinets. The +12 VDC is split 5 Ways on the terminal block A9-TB1 and connected to each of
the UHF Amplifier Trays. The +12 VDC is used for operation of the LED Status Indicators in the UHF Amplifier Tray.
Instruction Manual Description
The Instruction Manual is divided into sections which are labeled as to their contents. The first main section is the System
Section which contains the Parameters and Specifications of the 835A along with the Site Preparation, Installation, Initial Turn
On, System Set Up, Alignment and Operation Procedures. The Block Diagram and Interconnect Drawings for the Transmitter
are also found in the System Section.
The Manual is further divided into Tray and Assembly Sections. Each Tray or Assembly Section of the Manual contains the
Block Diagrams and Interconnects of that Assembly or Tray. Each of the Sections also contains the Circuit Descriptions and
Detailed Alignment Procedures for that Tray or Assembly.
The Schematics for the individual boards which make up the Trays and Assemblies in the Transmitter are located in the
Subassembly Section of the Manual. There is a Drawing List at the beginning of the Subassembly Section which lists the
drawings in the order they appear in the section.