Copyright Donald W Thomas, K5ZRQ
5
3.0 CONTROLS:
3.1 Front Panel
Figure 2-1 Front Controls
1.
POWER:
Switches AC power “On” and “Off”
2.
MODE:
STDBY Position: Exciter operated directly into the antenna on transmit.
OP Position: Transmitting amplifier will be switched in when the exciter is
in AM and keyed or when the exciter is keyed in SSB with
modulation applied.
3.
POWER:
LOW Position: Provides 300 Watts AM RF Output for the nominal 3 watts input.
HIGH Position: Provides 500 Watts AM RF Output for the nominal 3 watts input.
4.
DELAY:
SSB Position: Allows the relay to remain in “Transmit” mode during short
pauses while transmitting.
AM Position: Continuously keeps the LA-600 in the transmit mode so long
as the exciter is in transmit.
5.
PRE-AMP:
OFF Position: Exciter receives signal directly from antenna.
ON Position: Exciter receives signal from PRE-AMP which provides
approximately 6 db gain. The PRE-AMP switch operates
independently of the mode switch. The PRE-AMP is
disabled during transmit.
6.
RELATIVE POWER METER:
Reads relative output RF power.
7.
PILOT LIGHT:
Red lamp indicator shows when amplifier is powered on.
8.
LOAD:
Used to properly match the amplifier plate circuit to the antenna.
9.
PLATE:
Used to tune the PA output to resonance.
