Assembly Instructions

835A 4 kW, 5 kW or 6 kW UHF Transmitter Meters, Switches, Indicators and Samples

Name

Function

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Receicer Tray (Optional)

Samples - BNC Connectors mounted on front panel.

f(IF) Output A Sample of the IF Output taken from the IF Filter/ALC Board.

f(s) Oscillator A Sample of the Channel Oscillator Output taken from the Sample Jack of the

Channel Oscillator Assembly.

UHF Exciter Tray

Meters

Meter (A1-A18) Reads power in terms of a percentage of the calibrated Output Power level. A

full scale reading is 100% which is equivalent to the full rated Peak of Sync

Exciter Output Power. Also reads Audio, Video and ALC reading.

Switch (S3), Meter Selects the desired % Exciter Power, Video, or Audio Levels or the ALC Voltage

reading.

Audio Reads the Audio Level. (±25 kHz Balanced or ±75 kHz Composite)

(0-100 kHz)

ALC Reads the ALC Voltage Level. (.8 VDC Typical)

(0-1 V)

% Exciter Reads the % Exciter Output Power. (Level needed to attain

(0-100) 100% Output Power)

Video Reads the Video Level. (1V = 140 IRE)

(0-1 V)

Switches

Transmitter (S1) The momentary switch (S1) applies a ground to K1, a latching relay, located

Operate/Standby on the Transmitter Control Board. K1 will switch either to Operate or to Standby

depending on which direction S1 is pushed. When switched to Operate, a low,

Enable Command, is applied to each Amplifier Array which are split and

connected to each Amplifier Tray. These Enables turn on the UHF Amplifier

Trays. The opposite occurs when switched to Standby.

Mode Select (S2) The momentary switch (S2) applies a ground to K2, a latching relay, located

Auto/Manual on the Transmitter Control Board. K2 will switch the Transmitter to Automatic

or Manual depending on which direction S2 is pushed. In Automatic, the Video

Fault Command from the ALC Board will control the Operation of the

Transmitter. The Transmitter will switch to Standby, after a slight delay, if the

input video is lost and will switch back to Operate, quickly, when the Video is

restored. In Manual, the Transmitter is controlled by the Operator using the front

panel Operate/Standby Switch or by remote control.

PAGE 1
835A 4 kW, 5 kW or 6 kW UHF Transmitter Meters, Switches, Indicators and Samples Name Function Receicer Tray (Optional) Samples - BNC Connectors mounted on front panel. f(IF) Output A Sample of the IF Output taken from the IF Filter/ALC Board. f(s) Oscillator A Sample of the Channel Oscillator Output taken from the Sample Jack of the Channel Oscillator Assembly. UHF Exciter Tray Meters Meter (A1-A18) Switch (S3), Meter Reads power in terms of a percentage of the calibrated Output Power level.
PAGE 2
835A 4 kW, 5 kW or 6 kW UHF Transmitter Meters, Switches, Indicators and Samples Name Function UHF Exciter Tray - Continued Fault Indicators Video Loss (DS9 Red) Indicates that the Input Video has been lost to the Transmitter. The Fault is generated on the ALC Board located in the UHF Exciter Tray. VSWR Cutback (DS7 Amber) Indicates that Reflected Power Level of the Transmitter has increased above 20% which will automatically cutback the Output Power Level to 20 %.
PAGE 3
835A 4 kW, 5 kW or 6 kW UHF Transmitter Meters, Switches, Indicators and Samples Name Function UHF Amplifier Trays- Continued Status Indicators Overdrive (DS2 Red) Indicates that the level of the drive to the output amplifiers is too high. The protection circuit will limit drive to the set threshold. The Fault is generated on the Amplifier Control Board.