System Description Chapter 2

100 Watt High Band VHF Transmitter Chapter 2, System Description
420A, Rev. 0 2-5
Table 2-1. Meters
METER FUNCTION
METER (A18)
(mounted on the front panel)
Displays power in terms of a percentage of
the calibrated output power level. A full-
scale reading is 120%. A reading of 100%
is equivalent to the full-rated peak of sync
visual output power, 100 watts. Also reads
% Exciter, % Reflected, and % Aural Power
along with the ALC voltage, video, and
audio levels.
SWITCH (S3), METER
(mounted on the front panel)
Selects the desired % Power, ALC voltage,
video, or audio level reading
ALC
(0-1 V)
Displays the ALC voltage level (.85 VDC)
% EXCITER
(0-120)
Displays the % Exciter Output power (level
needed to attain 100% output power)
% REFLECTED
(0-120)
Displays the % Reflected Output power
(<10%)
% VISUAL POWER
(0-120)
Displays the % Visual Output power of the
transmitter (100%=100 watts peak of
sync)
% AURAL POWER
(0-120)
Displays the % Aural Output power of the
transmitter (100%=10 watts at 10 dB
A/V ratio)
VIDEO
(0-1V)
Displays the video level (1V at white with
.3V sync only, -40 IRE)
AUDIO
(0-100kHz)
Displays the audio level (±25 kHz balanced
or ±75 kHz composite); will not read if only
the 4.5 MHz composite input kit is used